Post-Fire Yard Contamination and Pets: Ash, Heavy Metals and Fire Retardant in the Ground Your Animal Lives On

The house gets cleaned. Somebody comes and does the floors, the ducts, the contents, the insurance walkthrough. The yard gets hosed off once and then it goes back to being the yard, which is where the dog spends most of its outdoor life, where the cat sleeps under the porch, where the chickens scratch, and where every one of them puts their mouth on the ground.

That gap is the whole subject of this page. The published guidance for a post-fire property is thorough about the interior and thin about the dirt, and where it does address the ground it addresses it in terms of children and gardens rather than animals. Meanwhile the questions owners actually type into a search box are specific and reasonable: is there lead in my yard now, was retardant dropped on my property, how long do I keep the dog off the grass, and where do I get the soil tested.

Some of those have real published answers. One of them has a real answer that only applies to two fires in one county. And one of them, the one about how much is too much for an animal, has no published answer at all, from anyone, and this page is going to say so in those words rather than round a human number into a pet number.

For the ground itself as a physical hazard, hot spots and sharp debris and burned pads, the gear side is covered on our boots for wildfire ash and hot debris page, and the walk-the-property-before-the-carrier-opens sequence is on our returning home with pets checklist. This page is the slower problem: the chemistry of the ground your animal is going to live on for the next several months.

What Federal Guidance Actually Says About Animals and Ash

EPA maintains a page called “Protect Yourself from Ash”, last updated July 28, 2026 and read for this article on August 11, 2026. It is the closest thing to a national reference on this hazard, and it gives animals exactly one sentence:

“Clean ash off pets and other animals and keep them away from contaminated sites.”

Read the sentences that open that same paragraph, because they change how the pets sentence lands. EPA writes: “Children should not be near ash or sites contaminated with ash. Children should be permitted to return only after affected areas have been cleaned up.” The sentence directly before the pets sentence is about a different subject: “Thoroughly clean ash off all children’s toys before use.” So for children, the page sets a condition for return. For animals, it sets an instruction to keep them away, and then stops. There is no equivalent clause telling you when a site stops counting as contaminated for a dog.

That asymmetry is not an oversight you can fix by reading harder. It is the actual state of the published record, and every honest answer further down this page follows from it.

The page is more specific about what is in the material. “Ash from burned structures in the wildland–urban interface generally contains more harmful chemicals than forest ash.” Under a bolded lead-in reading “Other dangers”, it names the categories: “Asbestos, heavy metals, and cancer-causing chemicals: These include metals (lead, arsenic, cadmium, chromium [total and hexavalent], copper, nickel, zinc), polycyclic aromatic hydrocarbons (or PAHs), dioxins, and furans.” The sentence after that one points readers to the Agency for Toxic Substances and Disease Registry’s ToxFAQs for detail, which is EPA declining to attach a health effect or a threshold to any individual item on its own list. We are going to decline in the same place.

Two more sentences from that page belong in a yard discussion specifically.

On the ground surfaces themselves: “Avoid dry sweeping or dusting. Never use a leaf blower. Before sweeping indoor and outdoor hard surfaces, mist them with water to keep dust down. Follow with wet mopping.” The same bullet ends with the sentence that matters most for a household with animals, and it is easy to skip: “When you wet down ash, use as little water as you can.” EPA also states “Avoid washing ash into storm drains.” These are instructions about hard surfaces, driveways and patios and walkways. They are not instructions about an animal’s coat, and nothing on that page tells you to mist or wet an animal.

On the garden: “Wash any fruits or vegetables from trees or gardens where ash has fallen.” That is EPA acknowledging the food layer of a yard without saying anything about whether the soil under it needs attention.

The Personal Protective Equipment Question, Which Has Two Wrong Answers

EPA’s ash page publishes a full equipment list, and it is worth quoting because a large number of people are going to make the same two mistakes with it.

For the person doing the cleanup, EPA states: “Wear work gloves, long-sleeved shirts, long pants, socks, and sturdy, thick-soled shoes to avoid skin contact.” Then: “Wear goggles and head coverings to keep ash out of your eyes and hair. Contact with wet ash can cause chemical burns or skin irritation.” That last clause is a reason to be careful about the hose, not just about the dust. For breathing, the page says to select a respirator that is NIOSH Approved and that carries the printed markings NIOSH and either N95 or P100, and it adds a specific exclusion: “Surgical masks and one-strap dust masks will not protect your lungs. They are not designed to seal tightly to the face.”

The first mistake is treating that list as optional because the job is outdoors and small. EPA’s own scoping sentence says otherwise: the recommended actions “are for everyone going to sites contaminated by ash.” It then names who should not be doing the work at all: “People with heart or lung disease, older adults, and pregnant women should not participate in ash cleanup efforts.”

The second mistake is the one this site cares about most, because a reader who has just been told to buy an N95 is standing in a hardware store aisle looking at a box of them and thinking about the dog. Los Angeles County Department of Public Health’s pet fact sheet answers that before it is asked, in language that does not leave room:

“Do not place an N95 respirator on your pet. N95 respirators for people can be harmful if used on pets. Elastic straps can choke or strangle pets and the mask material can block their ability to breathe through their nose or pant.”

The respirator is for you. There is no published equivalent for the animal, and the county’s stated reasons are mechanical rather than precautionary: strangulation and blocked breathing.

The Only Yard-Level Guidance That Names Pets and Soil in the Same Sentence

Los Angeles County Public Health published two long fire recovery FAQ documents in February 2025, one for properties inside burned areas and one for properties just outside them. They are county documents written for a specific event, so they are not national guidance, but they are the most detailed published treatment of the yard question we found, and both of them put pets in the soil section rather than only in the air-quality section.

From the FAQ for properties just outside burned areas, dated February 5, 2025, under the question about contaminated soil:

“If you’re concerned about soil contamination, consider testing it for contamination and avoid disturbing the soil to prevent harmful particles that may be present from becoming airborne. Look for visible ash or unusual residues on the soil surface, and limit contact by keeping children and pets away from the area.”

The same passage continues with the equipment instruction for anyone who does handle the soil, and it belongs directly against the sentence just quoted rather than read as a separate bullet: “If you need to handle or turn the soil, wear protective gear such as gloves, an N95 mask, and long-sleeved clothing.” Testing your own soil, covered later on this page, means collecting a composite sample from several spots in the yard, which is handling and turning soil in exactly the sense the county means by that sentence. The gloves, the N95 mask and the long sleeves belong on whoever collects that sample, not only on whoever is doing a larger cleanup. Then a covering instruction, and then this, which is the sentence after the one most people stop at: “Avoid using ash as fertilizer, especially if the fire burned synthetic materials, which include harmful residues.” That one matters in a yard where somebody is about to be helpful with a rake and a compost pile.

Elsewhere in the same document: “everyone should avoid contact with outdoor areas that have not been cleaned. Keep children and pets away from ash-covered areas to prevent ingestion or inhalation.” Its dedicated pets section adds: “Avoid walking pets in ash-covered areas, as they may inhale or ingest toxic particles. Clean their paws after outdoor exposure and ensure they have access to fresh water.” And its ash disposal instruction includes a detail written for exactly this kind of property: “Place sealed bags in covered trash bins to prevent them from being disturbed by wind or animals.”

The companion document for properties inside burned areas, dated February 25, 2025, states it more flatly: “Children, pregnant individuals, and pets should avoid the area until hazards are fully mitigated.”

Notice what none of these say. None of them names a duration, a rainfall count, a sweep, a test result, or a condition that ends the restriction for an animal. The phrase “until hazards are fully mitigated” is a real condition, and it is one assessed by the people running the debris removal in that jurisdiction, not by a homeowner looking at grass.

Where the Documents Stop Being Advice and Become a Stop Sign

Two of the same county documents draw a hard line, and it is the line this page will not help you cross.

From the outside-the-burn-area FAQ: “If hazardous materials are present, you should not attempt cleanup without professional assistance. Asbestos and lead require certified specialists for safe removal, as disturbing these materials can release dangerous fibers or particles into the air.” The sentence after that adds that “Testing by licensed professionals can confirm the presence of these hazards.”

From the inside-the-burn-area FAQ, under the question about asbestos or lead contamination on a destroyed property: “Do not attempt to remove asbestos or lead yourself.”

EPA’s ash page routes the same way without naming a specialty: “Consider seeking professional assistance if you find structural damage or hazardous materials, the HVAC system is impacted, or the scale of cleanup is more than you can manage on your own. Local authorities can recommend reputable specialists.” And on disposal: “If you suspect hazardous waste, including asbestos, is present, contact your local hazardous waste authorities regarding appropriate disposal.”

There is no homeowner method on this page for handling, bagging, wetting or disposing of suspected asbestos-containing debris, and there should not be one anywhere you find it either.

The Retardant Question: What the USC Study Measured, and What It Did Not

This is the part of the topic where a real finding gets stretched into a claim nobody made, so it is worth being slow.

In October 2024, Environmental Science and Technology Letters published a paper titled “Metals in Wildfire Suppressants”, by Marella Schammel, Samantha Gold and Daniel McCurry of the University of Southern California. The full text is open access. Its abstract reports that “Long-term fire retardants contained concentrations of toxic metals (V, Cr, Mn, Cu, As, Cd, Sb, Ba, Tl, and Pb) 4–2,880 times greater than drinking water regulatory limits, and potentially greater than some aquatic toxicity thresholds when released into the environment.” The sentence immediately after that in the abstract is the comparison people drop: “Water enhancers and Class A foams contained some metals, but at lower concentrations than fire retardants.” The category matters. Not every fire chemical behaved the same way in this study.

The paper also states why it used a drinking water yardstick, and this passage is the single most important thing on this page for anyone reading a headline about it:

“Because the metal content of these products is not regulated directly, metal concentrations were compared to U.S. drinking water EPA MCL values for context. While these products are not drinking water sources, concentrations many times in excess of an MCL may indicate the potential for drinking water contamination if rain flushes treated slopes into reservoirs.”

That is the authors telling you the comparison is a frame of reference chosen because no direct regulation exists, not a statement that anyone is drinking the product.

Now the methods, and read the whole sentence rather than the first clause of it: “Fourteen fire suppression products were obtained from commercial retailers (manufacturers and product names provided in Table S2) including fire retardants, water enhancers, and Class A foams listed on the U.S.F.S. QPL, and products targeted for consumer home use.” So the fourteen are a mix of what federal agencies buy and what a homeowner can buy off a shelf, which is worth knowing before assuming every number in the paper describes something an aircraft dropped. For products meant to be diluted before use, the paper’s table footnote states that “For products that recommend users to dilute before application, values reflect concentrations present after dilution.” The numbers describe a suppressant product, mixed as the manufacturer directs, in a laboratory. They do not describe soil, grass, a fence, a paw, or a coat.

The paper is explicit about that boundary in its closing paragraph, which asks for exactly the study it is not: “Further work should determine the environmental fate of metals released by aerial fire suppression (i.e., determine whether they remain in the soil column, permeate into groundwater, or enter nearby surface waters via runoff), and estimate the extent to which they contribute to human and ecological health risk.”

Here is the same distinction laid out plainly, because it is the trap this page exists to close.

Document	What it actually measured or states	What it does not establish
Schammel, Gold and McCurry, 2024	Metal concentrations in 14 fire suppression products bought from retailers, mixed per manufacturer directions	Any concentration in any yard, or that retardant was applied to a given property
LA County DPH soil testing, September 2025	Lead and other results from representative soil samples in and around two 2025 fire areas	A result for any individual parcel, or an animal exposure level
EPA “Protect Yourself from Ash”	What structure ash generally contains, and recommended human actions	A re-entry criterion for a pet
USFS wildland fire chemical clean-up	Clean-up steps for retardant, foam and gel on structures, vegetation, people and animals	A soil concentration, or a health threshold

One more honesty note on the sourcing. USC Viterbi’s own announcement of the study, published October 30, 2024, carries a subheadline saying “850,000 pounds of heavy metals have been released into the environment in the Western US from 2009-2021” while a bullet further down the same release says “An estimated 380,000 kg or ~1 million pounds of heavy metals are believed to have been released into the environment in the Western U.S. from 2009-2021”. Those two pound figures on one page do not match. Where this article needed a number, it used the peer-reviewed paper rather than the release.

The Manufacturer Dispute, Left Standing

The suppressant with the highest measured concentrations in that study was Phos-Chek LC-95W. Whether that specific formulation is the thing falling out of the aircraft you saw on the news is a live disagreement between the manufacturer and the federal agency that buys it, and this page does not settle it.

Reporting by Alex Wigglesworth for the Los Angeles Times on November 17, 2024 is the only source we found that prints both parties’ positions. It reports the manufacturer’s position in these words: “Perimeter Solutions, which manufactures Phos-Chek, said in a statement that the products are chemically different, and that LC-95W has never been used in aerial applications.” The next sentence completes that statement: “All Phos-Chek retardants used in aerial firefighting must be fully qualified by the Forest Service, which requires extensive testing to meet strict safety standards, the statement said.”

The next paragraph reports the agency’s position: “The Forest Service said it has used Phos-Chek LC-95W in aerial firefighting, albeit rarely.” Its own following sentence adds the agency’s reasoning: “The formulation has been approved for both aerial and ground applications after passing multiple safety tests, including a toxicity characteristic leaching protocol developed by the Environmental Protection Agency to simulate how much of a substance’s toxic contents would be released into a landfill, the agency said.”

We looked for either party’s own published version. Perimeter Solutions has no statement on the subject in the post archive on its own website that we could find, and the Forest Service’s wildland fire chemicals policy pages do not address the study. What does exist as a primary document is a product specification: the Forest Service’s own Product Information sheet for Phos-Chek LC-95-W, dated April 2021, lists under “Application” the words “Helicopter bucket, and ground engines.” A specification describing what equipment a product may be applied with is not a record of what was applied to any particular fire, and we are not treating it as one.

Three documents, two of them reported statements from parties with opposite interests, one of them a specification sheet dated April 2021. We are not in a position to say which party is right, and this page does not try.

There is a practical reason that unresolved dispute costs a pet owner less than it looks like it should. Nothing published tells a homeowner how to identify which chemical, if any, landed on their property, and the same reporting notes that “McCurry described the retardant his team tested as the colorless version of the bright-pink Phos-Chek that’s dumped from aircraft. The pink stuff, LC-95A, is not available for consumers to purchase.” A colorless product leaves no pink stripe to point at. The absence of a visible residue tells you nothing, and the presence of one is not an identification.

What the Forest Service Actually Tells Property Owners About Animals and Retardant

Separately from the metals question, the Forest Service publishes a short clean-up document for wildland fire chemicals, and it has a section headed “Pets & Other Animals” with four bullets. Its first bullet is the only instruction in the whole document about the animal itself, and it is one line: “Shampoo thoroughly as many of the products are very drying to skin..” (the doubled period is the source’s). No product, no dilution, no duration. Our boots for wildfire ash and hot debris page carries what else the agencies publish about washing an animal, and it is honest there about how thin that record is. The rest of the section is about water.

“Avoid ingestion of water – keep animals away from puddles.” And directly after it: “If your pet appears ill from drinking out of puddles or standing water, make sure your veterinarian knows the animal may have ingested a fertilizer-based product.” That second sentence is the useful one, because it tells you what to say on the phone.

In the structures section, the same document tells owners: “Restrict water use to prevent puddles which may be attractive to pets” and “Avoid leaving standing puddles of water by using absorbent materials such as sand, soil, or other materials.”

That instruction and EPA’s “use as little water as you can” are two different agencies writing about two different problems that happen to point the same direction on a property with animals. They are not the same sentence and we are not presenting them as one. What a household can take from having read both is that the hose creates a new hazard while it solves an old one, and that the puddle is the part an animal will find.

The document’s vegetation section explains something owners often mistake for chemical burn on a lawn: “Leaf burn may occur since retardants contain levels of fertilizer higher than what is often sold at garden stores. This causes vegetation and plants to appear dead after contact. However, they will generally recover and grow back - usually within one to two months.” The bullet directly after it covers the part of a yard somebody eats: “As with any garden produce, wash fruit and vegetables thoroughly before using.”

Los Angeles County’s pet fact sheet closes the same loop from the animal’s side of the yard, in a section headed “Ash and Debris Hazards”: “Keep pets from eating or licking anything on the ground. Do not allow pets to drink from puddles or water bowls that have been left outside. Feed pets indoors and do not put food or treats directly on the ground, use a bowl that can be washed and cleaned after use.”

What Happened When a County Actually Went and Sampled Yards

Most of the writing about this subject is about what might be in soil. Los Angeles County went and measured, and then published the result, which makes it the most useful document in the whole set even for a reader who lives nowhere near it.

Public Health’s press release of September 12, 2025 states that sampling was conducted by Roux Associates between February 18 and March 26, 2025, across sampling grids in and around the Eaton and Palisades fire regions, on destroyed properties, intact properties inside the burn areas, and properties just outside them, with results compared to California Department of Toxic Substances Control residential soil screening levels.

The headline result: the final findings confirmed “a higher percentage of soil samples with lead levels above health-based screening thresholds from parcels with intact homes downwind of the Eaton Fire.” On the source of that lead, the release states: “The source of lead in the fire is reasonably expected to be from the burning of homes with lead-based paint, which was common prior to 1979.”

Now the sentence that most write-ups of this finding dropped, and it is the load-bearing one: “However, because there are many potential sources of lead in soil in the Los Angeles area, additional assessments may help understand how much of the lead found in the samples came from the 2025 wildfires versus other sources.”

That is the county saying its own finding does not cleanly assign the lead to the fire.

For the other fire, the same release reports a different picture: “The results for the Palisades Fire Region did not identify any large-scale fire-related soil impacts, including for lead.” It then reports two isolated areas of exceedance and adds that “The source of these impacts and whether they are fire-related is unknown at this time, but these are not consistent with communitywide impacts from fire-related smoke plumes.” Two fires in the same county in the same month produced different soil findings, which is the strongest available argument against generalizing anybody’s result to your own yard.

The release also states what the numbers are and are not for: “The reported results are not intended to imply cleanup or specific remediation is necessary; rather, the results are intended to provide public health data to help identify areas that may potentially present a health risk and may require additional evaluation.” And on the limits of representative sampling: “Individual parcels may have unique factors that result in differences compared to these representative samples.”

Read that against the wind direction on the map. The finding was strongest for intact homes downwind, which is to say houses that never burned, belonging to people whose insurance claim was small or nonexistent and who had no reason to think their property was a contamination question at all. If your house came through a nearby fire untouched, that is the group you are in.

Getting Soil Tested: One Real Free Program, and the Route Everybody Else Has

Here is where geography decides the answer, so read the fence lines carefully.

The Los Angeles County program. Public Health ran free soil lead testing tied to the Eaton and Palisades fires. Its FAQ states: “This program provides free soil testing for lead. Testing is done by a certified laboratory and is only for lead. Soil samples from properties located within the burn scar, downwind of, and just outside, the Eaton and Palisades Fires areas can be submitted for testing.” The process was a composite sample the resident collects from several spots in the yard, dropped at a staffed location, with results returned by email from the laboratory. That collection step is the handling and turning of soil the county’s own contaminated-soil guidance addresses directly, quoted above: gloves, an N95 mask and long-sleeved clothing. It is also, without qualification, going to a site contaminated by ash, so EPA’s own exclusion for ash-cleanup work applies to it as much as it applies to sweeping a patio: “People with heart or lung disease, older adults, and pregnant women should not participate in ash cleanup efforts.”

That program is changing this week. Its own page, read on August 11, 2026, carries a banner: “Public Health Soil Testing Program Will Transition on August 15, 2026.” It states that “Our Public Health soil testing program is transitioning to the USC Clean Program” and that the “Last day to submit soil samples to our program is August 14, 2026.” USC’s own project page describes CLEAN as free and Los Angeles focused, and states that “CLEAN is a project from USC, and is separate from L.A. County Department of Public Health soil testing.” If you are in that geography, verify the current arrangement on both pages before you drive anywhere, because the handover date is inside the same week this article was written.

Everywhere else. There is no standing national program that tests your yard for you the way the county program did, but EPA publishes more routes than a straight lab submission, and this section should have named all of them. EPA’s “Lead in Soil” page, last updated April 24, 2026, publishes it: “Soil can be tested for lead in several ways, the best of which is to send samples to a laboratory that is qualified to determine lead concentrations. This testing can be done through laboratories accredited under EPA’s National Lead Laboratory Accreditation Program.” The same page adds three more doors: “There are also home soil testing kits that can be purchased online, where home soil samples are sent to a lab for analyses”, “Many state university agricultural departments and agricultural extension offices offer soil testing for lead at a cost”, and “Some local health departments may offer home soil lead testing.” For finding one, EPA gives a phone number: “For help finding a lead risk assessor or an accredited lead laboratory, contact the National Lead Information Center at 1-800-424-LEAD (5323).”

EPA’s page also names a screening route this section had missed: “Soil Screening, Health, Outreach and Partnership (soilSHOP): soilSHOP events help people learn if their soil is contaminated with lead and how to reduce exposures to contaminated soil and produce.” EPA’s own Region 3 fact sheet describes what happens at one: “You may also hear of an opportunity to have your soil screened for lead at “soilSHOP” events where organizers use an instrument called an x-ray fluorescence (XRF) meter to quickly estimate the concentration of lead in the soil sample.” An XRF reading at a soilSHOP event is a field screening estimate, not a laboratory result, and the two are not the same thing. Whether a given soilSHOP event is free could not be verified for this page. The program’s own site rejected every automated request we sent it during research, so check cost and schedule directly on ATSDR’s soilSHOP program page, the same page EPA’s own Region 3 fact sheet cites as its source, before assuming either way.

Two cautions travel with any result you get back.

EPA’s Region 3 fact sheet on lead in soil, dated August 2020, states: “It is important to keep in mind that the results for one or two samples collected from your yard do not necessarily represent soil levels throughout the yard. Soil is highly variable and lead concentrations can be quite different even in samples collected from one or two feet of each other.” The sentence after it is the one that tells you what to do with an unwelcome number: “If you are concerned about your soil lead results, consider contacting your cooperative extension service, public health department, or gardening organization to discuss the issue and next steps.” And the sentence after that one is the one nobody quotes, because it is about paperwork rather than health: “Note that testing results identifying a soil-lead hazard at pre-1978 properties are records that must be retained and disclosed to future tenants/buyers in accordance with the Lead Disclosure Rule.” That is a consequence of testing worth knowing before you send a sample, and it is not a reason not to test. A dog does not sample a yard evenly either. It has a spot.

And Los Angeles County’s own contractor guidance carries a sentence worth taping to the inside of a folder, written about indoor testing but stating a general principle about what a laboratory can and cannot do: “there are no laboratory tests that can determine if your property is “safe”, and all lab results must be evaluated in context with environmental conditions in and around your property.”

The Number Nobody Publishes

Now the question this page was really built for, and the honest answer to it.

Nothing we could find publishes a soil concentration that is about your animal. Not for a dog, not for a cat, not for a rabbit, not for a backyard flock. We looked, and here is what the search actually returned instead.

The screening levels a homeowner meets are built around people, and the documents say so in their own words. Los Angeles County’s lead guidance sheet, the one handed to residents to interpret a soil result, opens: “While no amount of lead is safe for human health, thresholds set by government agencies can help you understand your potential risk.” For its lowest published threshold, it describes a “screening level cutoff where concentrations may be unsafe for young children, fetuses, and pregnant people.” Children, fetuses, pregnant people. No animal appears anywhere on that sheet, and the sheet notes it is adapted from the USC CLEAN Program.

That sheet is worth opening in full if you are holding a result, because it publishes several escalating bands with a different recommended action attached to each, up to and including a level at which it says to seek additional testing and consult a doctor about blood lead testing. We are not reprinting its numbers here, because every one of them is a threshold set for a person and reprinting them next to a discussion of dogs is exactly how a human number becomes a pet number. Read them on the county’s own sheet, against the people in your household.

EPA’s Region 3 fact sheet is blunter about the whole category: “There is no single threshold that defines acceptable levels of lead in soil.” The next sentence explains why: “State and federal regulatory and guidance values may only address specific situations and are mostly focused on cleaning up industrial properties.” Read that sentence against the rest of the same fact sheet rather than stopping there. Two paragraphs later, the same document does go on to define a numeric soil lead hazard, in a table for garden soil, for people rather than for a dog or a cat. It is also dated August 2020, and that number has since moved. LA County’s own lead guidance sheet, cited above, states: “In 2024, the EPA set a safety threshold for lead levels of 200 parts per million (ppm), down from the previous level of 400 ppm.” So the Region 3 sheet’s own figures are the ones EPA has since lowered, not EPA’s current position, and this page holds to the same rule it applies to LA County’s bands: no human number gets reprinted here next to a discussion of a dog or a cat.

On the veterinary side, the Merck Veterinary Manual’s chapter on lead poisoning in animals, under full review as of June 2026 and authored by Tina Wismer of ASPCA Poison Control, publishes toxic doses for several species expressed as milligrams of lead per kilogram of the animal’s body weight. It also states, for one of the two species most people reading this own: “There is no good information regarding a toxic dose in cats.”

Those are two different measurement systems that never meet. One is a concentration in a volume of dirt. The other is a mass of lead per mass of animal. Nothing published converts between them for a pet, because nobody has measured how much soil a specific dog eats in a day in a specific yard, and inventing that number is precisely the kind of arithmetic this site refuses to do.

What the same Merck chapter does publish about soil comes with a species restriction that must travel with it: “Soil contaminated with lead can be another source in grazing animals.” Grazing animals. If you keep goats, sheep, horses or a flock, that sentence is about you in a way it is not about a house cat, and the sentence right after it names the risk factors: “Young age, pica, and greater accessibility to lead are key risk factors associated with the toxicosis.” A puppy that eats things is inside that description whether or not it grazes.

How Dirt Gets Inside an Animal, in the Words of Sources That Describe It

EPA’s ash page does not describe an ingestion pathway for animals, so nothing in this section is attributed to it. Two other sources do describe one.

The Merck Veterinary Manual gives the mechanism for one species: “Dermal absorption of lead is poor; however, grooming behavior of cats can turn a dermal exposure into an oral exposure.” The same chapter reports a documented instance of that route: “The consumption, through grooming, of dust created from sanding lead-painted woodwork has been reported in cats.” That was a renovation, not a fire, but the pathway is the pathway.

AVMA’s JAVMA News published an article in September 2017 on lead in pets, which reports on a 1994 study of animals near a shuttered lead smelter. Its description of that study: “The study, conducted for Illinois’ Hazardous Waste Research and Information Center, examined effects of lead-contaminated soil on dogs, cats, and children near a shuttered lead smelter.” The result, in the article’s own words: “About 30 percent of pets and 13 percent of people had high blood lead concentrations, according to the report. Dogs and cats increase their risk through chewing, digging, and grooming.”

The sentences that come next in that article are the ones a household with both a child and a dog should not skip. The report it quotes states “There is a strong, positive relationship between BLC in animals and their owners, especially pre-school children”, and concludes “Because testing an entire population potentially exposed to lead is such a costly and stressful process, it is our suggestion to test dogs and cats instead.” In other words, the animal was being proposed as the cheaper early warning for the family, which is a strange and slightly uncomfortable thing to read as a pet owner, and it is what the source says.

Chewing, digging, grooming. That is a 1994 study of a shuttered-smelter neighborhood, conducted for Illinois’ Hazardous Waste Research and Information Center, rather than a burn scar in 2026, and it is not a finding about wildfire ash, so treat it as a description of how animals interact with contaminated ground rather than as a measurement of your situation. But it is the clearest published statement we found of why a yard is a different exposure problem for an animal than it is for the person who lives in the same house. The person walks across it in shoes. The animal digs in it, lies down in it, and then licks itself clean.

EPA’s separate “Lead in Soil” page, last updated April 24, 2026, adds the direction that runs the other way, and it is worth noting exactly what problem EPA is solving with it. Under a heading called “Don’t Track It In”, EPA writes: “Reduce exposure from pets by wiping off their fur and paws after they have been outside, especially if they are dirty or muddy.” The heading is the context. That bullet sits in a list about keeping contaminated soil out of the house, alongside doormats and shoe removal, and the sentence after it says to “Leave tools, clothes, or other soiled items outside, or wash them thoroughly before bringing them indoors.” The same page states the underlying fact: “Lead in soil can be tracked into homes on shoes, clothes, pets, or other objects that touch lead-contaminated soil or dust, contributing to lead in dust.”

So the wipe-down does two jobs at once. Los Angeles County’s pet fact sheet frames it for the animal: “After walking outdoors, wipe your pet’s paws and coat with a damp cloth. Consider bathing your pet more frequently based on their activity and exposures outside.” EPA frames it for the household. Neither one calls it decontamination, and neither publishes a technique, a product, a duration or a frequency. Neither one mentions your hands, either, but the earlier section of this same page does: EPA states that its recommended actions “are for everyone going to sites contaminated by ash”, that contact with wet ash “can cause chemical burns or skin irritation”, and it states what the person doing that work should wear: “Wear work gloves, long-sleeved shirts, long pants, socks, and sturdy, thick-soled shoes to avoid skin contact.” A damp cloth wiped over an ash-loaded coat is wet ash against skin. That is the reason the gloves belong on your hands for the wipe-down too, not only for sweeping the patio. Our page on boots for wildfire ash and hot debris carries what the agencies do publish about washing an animal, including the Forest Service’s own shampoo instruction for retardant, and it is honest there about how thin that record is.

The Food Layer of a Yard

If your yard produces something anybody eats, the published record gets slightly thicker, and it points at a species this site covers separately.

EPA’s ash page says to “Wash any fruits or vegetables from trees or gardens where ash has fallen.” Los Angeles County’s outside-the-burn-area FAQ goes further into home gardens and quotes UC Cooperative Extension guidance on post-fire soil sampling for a food-growing area, including a mapping step so results can be tied back to specific spots. It also states that “Contaminants detected in post-fire soil testing may have been present there before the fire.”

For a backyard flock, the AVMA article cited above reports research by Dr. Robert Poppenga at UC Davis: “about 3 percent of backyard chickens submitted for necropsy were positive for lead exposure. The study examined the livers of 1,200 chickens, most from urban areas.” The sentences that follow it are the reason it is here: “Some passed enough lead into their eggs that a child eating one egg daily would exceed EPA-recommended lead ingestion limits. Yet, most chickens lacked clinical signs of illness.” That is urban backyard flocks generally, not fire-affected ones, and the article does not connect it to wildfire. But a bird that scratches all day in soil, shows nothing, and lays an egg somebody eats is a distinct problem from a dog that walks on the same soil, and if you keep chickens it is worth raising with your veterinarian and your county before the eggs go back on the table. Our backyard flock evacuation guide covers the evacuation logistics for a backyard flock.

What This Page Will Not Tell You To Do

Every honest page has a list like this, and on this subject the list is long enough that hiding it would be dishonest.

It will not tell you to test, remove, cap, till or replace your soil. Those are real published actions in real county and federal documents, and they belong to the body that published them for the property it was written about. EPA’s “Lead in Soil” page, for instance, does publish “Cover contaminated soil with a thick layer of clean soil, vegetation, mulch, or other materials” as an action a family can take, and Los Angeles County publishes a mulch and ground cover version of the same idea. Neither of them wrote it for an animal, and neither states what covering soil does or does not do for a dog that digs. Take those to your county and to a professional who can see the property.

It will not give you a re-entry interval. No source verified for this page publishes one for an animal. If a page you find elsewhere gives you a number of days, ask which agency published it.

It will not call a yard clean. Los Angeles County’s own contractor guidance says a laboratory cannot do that for a property, and this page is not in a better position than a laboratory.

It will not name a chemical you cannot identify. A stain is not an identification. A colorless retardant leaves no color at all, and the ash on your patio came from your neighborhood’s building materials rather than from a published list.

It will not resolve the manufacturer dispute. Two parties with opposite interests gave opposite statements to a newspaper. That is the record.

What is left after all of those subtractions is still a useful page, because the subtractions are the finding.

The Checklist That Survives All of That

• Get the local answer first. Call your county or state public health department and ask what it publishes about soil and yard hazards for your specific fire. If it published a testing program, ask its geography and its end date, because these programs are scoped to an event and they close.
• Treat visible ash and residue as the trigger rather than the calendar. Both LA County FAQs describe the restriction in terms of ash-covered areas and unmitigated hazards, not in terms of elapsed days.
• Keep the animal off it while it is visible, and read that instruction as EPA wrote it: clean ash off pets and other animals, and keep them away from contaminated sites.
• Do not put a respirator, a mask or any human protective equipment on an animal. LA County Public Health publishes the reasons: strangulation risk from the straps and blocked breathing from the mask material.
• Solve the water before you solve the dust. If you hose anything, do not leave puddles. That is the Forest Service’s published instruction for a property with pets, and EPA’s separate instruction is to use as little water as you can when you wet ash down.
• Feed and water indoors. LA County’s pet fact sheet says not to let pets drink from puddles or from bowls left outside, and not to put food or treats directly on the ground.
• Wipe paws and coat after outdoor time, and keep doing it after the visible ash is gone, because EPA’s lead guidance treats the animal as one of the routes soil takes into a house. Wear the work gloves EPA lists for anyone at an ash-contaminated site while you do it: EPA states contact with wet ash “can cause chemical burns or skin irritation.”
• If you want a soil result, use an accredited laboratory. EPA names its National Lead Laboratory Accreditation Program, state university agricultural extension labs, and local health departments, and gives 1-800-424-LEAD (5323) for help finding one. Collecting the sample is handling and turning soil, so wear the gloves, N95 mask and long-sleeved clothing LA County names for that act, and if you have heart or lung disease, are an older adult, or are pregnant, EPA’s ash-cleanup exclusion applies to this step too.
• Read any result you get as a sample, not a verdict. EPA’s Region 3 fact sheet warns that lead concentrations “can be quite different even in samples collected from one or two feet of each other.”
• Stop at asbestos and lead. Both LA County documents say not to attempt that cleanup yourself, and EPA routes suspected hazardous waste to your local hazardous waste authorities.
• Put the question to your veterinarian in the form they can act on. Not “is my yard safe,” but “here is my soil result, here is how much time this animal spends digging in it, and here is what it has been doing since we came back.”
• If you think something has been swallowed, call. Your veterinarian first, and the ASPCA Animal Poison Control Center at (888) 426-4435, which the ASPCA describes as available 24/7, 365 days a year, noting that a consultation fee may apply.

Where to Go Next

This page is the ground-chemistry spoke of our pet emergency playbooks hub, and the rest of the post-fire problem splits three ways.

The ground as a physical hazard. Boots for wildfire ash and hot debris covers heat, sharp debris and what a sole can and cannot do, plus what the agencies publish about washing retardant and ash off an animal.

The first hour back. Returning home with pets after a disaster covers the property walk, the containment audit and the indoor cleaning sequence that happens before a carrier door opens.

The air, before and after. Wildfire smoke and pets covers the smoke side of the same event, mapped to air quality, and it carries the ash and hot-ground hazards as they apply during and immediately after the fire.

Then do the one thing on this page that has a definite answer. Find out, in writing, whether your county has published anything about soil in your fire area, and write down where it is published. The rest of this subject is genuinely unsettled, and knowing which parts are unsettled is what stops a stranger on the internet from handing you a number for your dog that nobody ever measured.