Heavy Metals in Cat Food: What the 2026 Clean Label Project Report Found

If you feed your cat dry kibble or a fish-flavored wet food, a new report deserves your attention. On October 2, 2026, the nonprofit Clean Label Project released its 2026 Cat Food Category Report after testing 100 of America's top-selling cat foods from 62 brands for more than 122 contaminants — and the results are making national headlines. Lead turned up in 99% of the products tested. Before you panic or switch foods, here's what the numbers actually mean, what the study can't tell you, and the single most useful thing you can do about it.

Direct Answer: The Clean Label Project's 2026 report tested 100 cat foods from 62 brands for 122+ contaminants. Lead was detected in 99% of products, cadmium in 96%, and arsenic in 94%. Dry food carried roughly three times more lead than wet or air-dried food, and fish-based products contained far more mercury than poultry-based ones. The study compares contaminant levels — it does not declare any product unsafe. The report's own recommendation: ask your pet food brand whether it regularly tests finished products for heavy metals.

Key Takeaways

• Lead was detected in 99% of the 100 products tested — along with cadmium (96%) and arsenic (94%).
• Dry food carried roughly 3x more lead than wet or air-dried food, after accounting for calories.
• Fish and seafood recipes had far more mercury: about 18x more overall, and fish-based wet foods had about 28x more mercury than wet foods made with other proteins.
• Poultry-based foods fared best: nearly 85% met the project's purity standard, versus 25.7% of fish and seafood products.
• The study was designed to compare contaminant levels, not to declare any product unsafe — and each product came from a single batch.
• The most useful action you can take: ask your brand whether it regularly tests finished products for heavy metals.

What did the report actually test?

The Clean Label Project, a nonprofit focused on transparency in product labeling, tested 100 of the nation's top-selling cat food products across 62 brands. The products covered the full range of formats: dry food, wet food, and air-dried or freeze-dried food. Each was screened for more than 122 industrial and environmental contaminants and toxins — including heavy metals, phthalates, pesticides, herbicide residues, and processing by-products.

This follows a similar dog food study the organization released earlier in 2026. "Cat owners trust that the food they put in their pet's bowl every day is safe, but there is an enormous amount of information they simply cannot get from the label," said Molly Hamilton, the project's executive director. "Finding heavy metals in nearly every product we tested is concerning, but what is especially striking is how dramatically contaminant levels can vary depending on the protein source and type of food."

That last point is the real story of this report. The headline numbers are startling, but the variation between products is where the useful information lives.

The headline numbers: lead, cadmium, and arsenic

Heavy metals were widespread across the category:

• Lead was detected in 99% of products.
• Cadmium was detected in 96% of products.
• Arsenic was detected in 94% of products.

Those numbers sound alarming — and they deserve attention. But detection is not the same as danger. The testing picks up trace amounts far below what older methods could see, and the study was built to compare how contaminant levels differ between products, not to determine whether any specific food could make a cat sick. Keep that distinction in mind as you read on, because it changes how you should act on these findings.

Dry food vs. wet food: the lead pattern

One of the clearest patterns in the data involves food format. Dry cat food carried roughly three times more lead than wet or air-dried food, after the researchers accounted for calorie content. Interestingly, lead levels were not tied to any particular protein source — the format itself was the differentiator.

The report's practical takeaway: wet or air-dried products are preferable to dry food if you want to reduce lead exposure. That doesn't mean kibble is dangerous — again, the study doesn't make safety rulings — but if you're already feeding a mix, this is a data point in favor of the wet side of the bowl.

Protein source matters more than you'd expect

The biggest differences showed up between protein sources:

• Poultry-based foods fared best overall: nearly 85% met the project's purity standard.
• Fish and seafood products fared worst: only 25.7% met the same standard.
• Mercury: fish and seafood products contained about 18 times more mercury overall than other products. Among wet foods, fish-based recipes had about 28 times more mercury than wet foods made with other proteins. Nearly half (48.6%) of fish and seafood products ranked among the highest-mercury foods tested — none of the poultry-based products did.
• Cadmium: fish-based products contained about 2.5 times more cadmium than other products.
• Chicken-based products saw higher rates of lead and herbicides, though they still outperformed fish on the overall purity measure.

If your cat eats fish-flavored food at every meal, the report suggests variety is your friend. Rotating proteins — or making poultry the default with fish as the occasional change of pace — is the simplest way to act on this finding.

What the study does NOT prove

Honest reporting means being clear about the limits, and this study has several worth knowing:

• It does not declare any product unsafe. The project states this explicitly: the research was designed to compare contaminant levels among cat foods, not to determine whether a particular product could cause illness or harm.
• Each product came from a single batch. The results don't capture how contaminant levels might vary between batches of the same food.
• Most brands contributed only one product. That limits what the study can show about any individual brand — one product isn't a brand verdict.
• Our products were not part of this study. We're sharing these findings as public-service information for cat owners, not as a claim about our own foods.

A study can be both important and limited. This one is a strong argument for more transparency in the industry — and for asking better questions as a shopper — rather than a reason to panic about the bag or can currently in your kitchen.

The one question the experts say to ask

Here's the report's own headline recommendation, and it's refreshingly simple: ask your pet food brand whether it regularly tests finished products for heavy metals.

Not raw ingredients — finished products, the actual food in the bag or can. That's the distinction that matters, because contamination can enter at any stage of manufacturing.

What does a good answer look like? A brand that tests routinely and can point to results, certifications, or a testing program it describes openly. Be cautious of brands that only test raw ingredients, can't describe any testing program, or won't answer the question at all. You don't need a chemistry degree to ask it — an email or a message through the brand's contact page works fine.

Practical takeaways for your cat's bowl

Putting the findings together, here's what a reasonable cat owner can do this week:

• Vary the diet. The report explicitly recommends rotating your cat's food rather than feeding the same product indefinitely.
• Lean toward wet or air-dried over dry when you have the choice, for lower lead exposure.
• Rotate protein sources. If fish is the everyday food, make poultry the new default and fish the occasional treat.
• Read the ingredient list. The report suggests avoiding foods with plants in the top ten ingredients to lower pesticide exposure.
• Ask brands the heavy-metals question. One email per brand you buy from is enough.
• Don't panic-switch. No single study should trigger a frantic food change — and sudden diet changes can upset your cat's stomach. If you're concerned, talk to your vet about what's right for your individual cat.

Shop our cat food collection

If this report has you rethinking what's in your cat's bowl, start with the label — and with brands that welcome the question above. Browse our cat food and supplies and the wider pet food collection to compare options.

Frequently asked questions

Is my cat's food unsafe?

This study doesn't answer that question — it wasn't designed to. It compares contaminant levels across products so shoppers can see the differences the label doesn't show. If you're worried about your cat's specific food, the most useful step is asking the brand whether it tests finished products for heavy metals, and discussing any concerns with your veterinarian.

Should I stop feeding dry food?

The report found dry food carried roughly three times more lead than wet or air-dried food, and suggests wet or air-dried is preferable for lower lead exposure. But it doesn't declare dry food unsafe. Many cats do well on dry food for dental or budget reasons — consider mixing in wet food rather than making an abrupt switch, and talk to your vet about your cat's specific needs.

Is poultry-based cat food better than fish-based?

In this study, poultry-based foods met the purity standard far more often (about 85% versus 25.7% for fish and seafood), and fish-based products had substantially more mercury and cadmium. That said, fish is a fine occasional protein — the takeaway is variety, not elimination.

Were Advance Pet Mart products tested in this study?

No. The study tested 100 top-selling products from 62 national brands. We're publishing this breakdown because our customers deserve to know what's happening in the industry — not because we have test results of our own to share. If and when we have finished-product testing data, we'll publish it.

Sources: the Clean Label Project's 2026 Cat Food Category Report via USA Today and the official study release; reporting on the findings via CNN.