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By Chad, cat dad to Fawn and Arya. I’m not a vet. I read the full 2026 study and its methodology, and every figure below comes from it.
Here is a fun thing to learn over coffee: there is almost certainly lead in your cat’s food. Mine too. A nonprofit called the Clean Label Project just sent 100 cat foods from 62 brands to an accredited lab and tested them for more than 122 contaminants. Lead showed up in 99 of them.
Before you dump the pantry into the trash: that headline is real, but it is not the part that matters. What matters is that contamination was not random. It tracked the protein, the format, and the ingredient list, which means you can actually shop around it. Below is what the study found, which foods ranked cleanest, and what we feed Arya and Fawn.
Quick answer
Yes, most cat food contains heavy metals. In 2026 testing of 100 foods, lead turned up in 99%, cadmium in 96%, and arsenic in 94%, so the real question is how much. Poultry recipes tested far cleaner than fish, wet food carried about a third of the lead of dry, and shorter, meat-forward ingredient lists did best. Each product was tested from a single batch, so treat this as a ranking, not a safety verdict.
Quick Picks: What We’d Put in the Bowl
- Our everyday pick: Smalls Fresh, gently cooked, and its Smooth Bird Chicken Recipe made the study’s Clean Sixteen wet list. This is what goes in our bowls.
- Best canned pick: Tiki Cat Chicken & Pumpkin Recipe in Broth All four Tiki Cat wet recipes in the study made the clean list, including duck, lamb and tuna versions.
- Best freeze-dried: Weruva Paw Lickin’ Chicken Made the freeze-dried side of the study’s list, from a brand our girls have eaten before.
- Feeding kibble? Only two kibbles made the dry list: Hill’s Science Diet Adult 1-6 Chicken Recipe and Kirkland Signature Chicken & Rice.
What the Clean Label Project Actually Tested
The setup matters, because it is what makes these numbers worth your time. The team bought 100 cat foods off the shelf: 31 dry kibbles, 40 wet foods (cans and pouches), and 29 air-dried or freeze-dried. An ISO 17025 accredited lab screened every one for heavy metals (lead, cadmium, arsenic, mercury), plasticizers, BPA and BPS, pesticides, glyphosate, and acrylamide. The methods are on the Clean Label Project’s study page if you want to check them.
Then they did something smart. Instead of measuring contamination per pound of food, they reported it per 1,000 calories. Wet food is mostly water, so a cat eats roughly four times more of it by weight to get the same calories. Measured per pound, wet food would look several times cleaner than it really is just because it is soggy. Measured per calorie, you see what actually reaches your cat.
Chaddy note: There are no contaminant-specific federal limits for cat food. The few animal feed reference values that exist were built to prevent acute poisoning in livestock, not to protect a housecat eating the same food every day for 15 years. So the study ranks every product against the rest of the aisle instead. That makes it a comparison, not a safety verdict, and the comparison is still useful.
The 6 Findings That Actually Matter
All six come from the Clean Label Project’s 2026 cat food study, with contamination measured per 1,000 calories.
1. Heavy metals are in nearly everything
Lead in 99% of products, cadmium in 96%, arsenic in 94%. They occur naturally in soil and water and ride into the food through both plant and animal ingredients. Nobody is adding them on purpose. But the worst products carried about 3.5 times the lead of a typical one, so the spread between brands is where your leverage is.
2. Protein source beats everything else
This was the biggest predictor on the package. 84.8% of poultry-based recipes met the study’s purity standard. Only 25.7% of fish and seafood recipes did. That makes poultry 3.3 times as likely to make the cut.
3. Fish brings the mercury
Seafood recipes carried about 18 times the mercury of everything else. Among wet foods the gap was 28x. Nearly half of the fish-based products ranked among the highest for mercury; not a single poultry product did. Fish recipes also carried about 2.5 times the cadmium.
The ingredients most strongly tied to contamination across the study’s combined data were herring meal, tuna, and fish broth. Herring meal in particular put a food in the dirtiest 10% about 60% of the time. And watch the fine print: foods with a marine ingredient buried in the list, but no fish in the name, still ran higher.
4. Dry food carried about 3x the lead
Kibble had roughly three times the lead of wet or air-dried food, even after accounting for calories and protein source. Unlike mercury, it was not tied to any one ingredient, which points at how dry food is made rather than what goes in it.
5. More plants, more herbicide
Glyphosate showed up in 37% of products. In this sample, every additional plant ingredient in the first ten on the label was associated with about 40% more of it. And 35 of the 100 foods used “ingredient splitting”: meat listed first, then a top ten mostly made of plant ingredients, sometimes the same crop listed twice (pea protein, pea flour). Those split labels also tended to carry more lead.
6. Cans and pouches hold the plasticizer
DEHP, a phthalate linked to hormone disruption, turned up in 48 of the 100 products. It appeared at similar rates in every format, but canned and pouched foods carried about five times as much as bagged ones. The good news on packaging: BPA showed up in only two products, BPS in one.
Chaddy note: Keep this in proportion. The study ranks foods against each other; it does not show that any specific food will make your cat sick, and each product was tested from a single batch. The case for caution is simple: cats eat the same food every day for years, so small differences repeat. That is a reason to choose well, not a proven health outcome, because the study did not measure health effects. If your cat has a health condition or you are changing diets, loop in your vet.
The Clean Sixteen: Which Cat Foods Tested Cleanest
Out of the 100, the study named 16 wet and 16 dry or freeze-dried options with the lowest combined scores across all six test panels. All 32, with exact recipe names, live on my Clean 16 cat food list. Here are the highlights.
Wet highlights
- Smalls Smooth Bird Chicken Recipe
- Tiki Cat Chicken & Pumpkin Recipe in Broth, plus its duck, lamb and tuna versions
- Purina Fancy Feast Grilled Turkey Feast in Gravy
- Friskies Salmon Dinner Pate
- Sheba Cuts in Gravy, Roasted Chicken Entree
Dry and freeze-dried highlights
- Hill’s Science Diet Adult 1-6 Chicken Recipe (kibble)
- Kirkland Signature Chicken & Rice (kibble)
- Weruva Paw Lickin’ Chicken (freeze-dried)
- Stella & Chewy’s Duck Duck Goose and Tummy Ticklin’ Turkey (freeze-dried)
- Bixbi Rawbble Turkey Recipe (freeze-dried)
Three things jump out. First, price is not purity. Grocery-aisle brands and premium brands both made the list, and plenty of pricey foods did not. Second, consistency counts. All four Tiki Cat wet recipes in the study made the wet list, and no other brand placed four. Third, only two traditional kibbles made the dry list. The rest are freeze-dried or air-dried, which lines up with the lead finding above. These results cover the named recipes only; most of each brand’s line was never tested.
Wondering about the brand in your own cupboard? I went through the supermarket names one at a time in whether Fancy Feast, Friskies and Sheba have lead. The complete list of all 100 foods tested is on the Clean Label Project’s tested products page.
So, About Our Bowl
If you skimmed those highlights, you may have spotted a familiar name at the top. Yes, that Smalls. The same Smalls that has been our top pick in our guide to what to feed a cat since well before this study existed.
Smalls is also one of only three cat food brands the Clean Label Project currently certifies (Bixbi and Freshpet are the others). I will be honest: I did not pick Smalls for its heavy metal numbers. I picked it because it is fresh, gently cooked, high in moisture, and built on meat instead of filler, and because it is what Arya and Fawn eat most days, which is not nothing for two cats with opinions. Learning it also tests among the cleanest foods on the market was a very pleasant bonus.
Full disclosure, because you deserve it: we are a Smalls affiliate, so if you sign up through our link we earn a commission at no extra cost to you. We recommended it before the money and would stand by it without it. See Smalls plans and pricing here.
And because I promised honesty: the Smalls recipe on the list is Smooth Bird, its chicken recipe. That is the one the lab tested, so it is the one this study vouches for. If your cat eats a fish-based Smalls recipe, the same check-before-you-assume rule applies.
What to Actually Do With This (Without Panicking)
None of this means starting over. It requires a few smarter defaults.
- Let wet or fresh food lead. This study adds a new reason to the ones in our feeding guide: wet formats carried about a third of the lead of dry food per calorie, on top of the moisture and protein advantages.
- Keep kibble in a supporting role. We feed some ourselves, a small portioned lunch, served in a puzzle feeder. Dry food is not the enemy. A bowl of it left out all day as the whole diet is.
- Default to poultry and rotate. If your cat eats a fish-based food every single day, work in chicken, turkey, or duck. You do not have to drop fish; just do not make it the only thing in the bowl.
- Read past the first ingredient. Count the plant ingredients in the top ten. In this sample, more plant ingredients meant more glyphosate, and split labels tended to carry more lead.
- Ask your brand one question. Do you test the finished product for heavy metals, not just the ingredients? Brands that screen routinely tend to deliver more consistent results batch to batch.
Bonus: that puzzle feeder pulls double duty (the Catstages Buggin’ Out Puzzle & Slow Feeder is a good one). Making a meal into a small hunt is one of the easiest enrichment upgrades there is, and it is a staple of fixing indoor cat boredom. You will find our favorite feeders and food puzzles in our cat enrichment toy roundup.
Chaddy tip: Switching foods because of this study? Go slow. Mix the new food in over about seven to ten days, a little more each day, or you will trade a lab result for an upset stomach and a cat who now distrusts the new bowl.
If your cat is eating well but still bouncing off the walls, the bowl is not the problem. Get the free Indoor Cat Boredom Fix Kit, a seven-day plan that pairs mealtime with play so your cat burns energy on your schedule, not at 3am.
The Bottom Line
Heavy metals in cat food are close to universal, and there are no contaminant-specific limits for cat food. You cannot get to zero. You can get a lot lower: lean on poultry over fish, let wet or fresh food lead, keep kibble in a supporting role, and favor short, meat-forward labels.
Our own answer has not changed, it just got some lab data behind it. Smalls is what we feed Arya and Fawn, and after this study I feel even better about it.
Frequently Asked Questions
Is there lead in cat food?
Almost certainly. In the Clean Label Project’s 2026 testing of 100 cat foods, lead was detected in 99% of products. The levels varied widely, with the worst products carrying about 3.5 times the lead of a typical one, so choosing well still makes a real difference.
Is wet or dry cat food safer for heavy metals?
Per calorie, dry kibble carried roughly three times the lead of wet or air-dried food. Wet food did carry more of the plasticizer DEHP, likely from cans and pouches, so no format is perfect. Overall, wet or fresh food leading the diet with dry in a supporting role is a sensible default.
Is fish-based cat food bad for cats?
Not automatically, but it is the riskiest category. Fish and seafood recipes averaged about 18 times the mercury of other proteins, and only about one in four met the study’s purity standard. A few fish recipes did test clean. If your cat eats seafood daily, rotate in poultry.
Which cat foods tested cleanest in 2026?
The Clean Label Project named a Clean Sixteen for wet food and one for dry and freeze-dried food. The wet list includes Smalls, Applaws, Freshpet, Friskies, Instinct, Nulo, Fancy Feast, Pro Plan, Reveal, Sheba and Tiki Cat recipes. All 32 names are on our Clean 16 cat food list.
Is Smalls cat food on the Clean Label Project list?
Yes. Its Smooth Bird Chicken Recipe was named one of the 16 cleanest wet cat foods in the 2026 study, and Smalls is one of three cat food brands the Clean Label Project certifies.
Is the Clean Label Project legit?
It is a nonprofit that used an ISO 17025 accredited lab and published its methodology and limitations, including that each product came from a single batch. It also runs a certification program that brands take part in, which has drawn criticism from parts of the food industry. Treat it as a useful data point, not the final word.
