Pet waste is a routine part of caring for dogs and cats, but its total volume can become substantial. The available figures range from individual-dog estimates to citywide totals, survey results, disposal choices, and pathogen persistence. Together, they show why timely cleanup matters for yards, sidewalks, stormwater, and nearby water.
Contents
- How much waste dogs produce
- City and regional pet-waste totals
- What cleanup surveys show
- Dog and cat disposal habits
- Why pet waste can affect water
- How long organisms can persist
How much waste dogs produce
The EPA’s Composting Dog Waste booklet gives a typical daily estimate of 0.75 pounds of waste per dog. On an annual basis, the same source estimates 274 pounds per typical dog. That annual figure makes the everyday task easier to picture: one dog can generate hundreds of pounds of waste in a year.
The estimate also scales quickly for people caring for multiple dogs. The EPA booklet says a musher with 20 dogs must dispose of more than 2 tons of dog waste annually. This is a specific example rather than a universal household estimate, but it illustrates how dog count changes the waste-management challenge.
Not every source uses the same per-dog assumption. EPA Rhode Island stormwater guidance generally estimates 0.5 pounds of feces per dog per day. In Rhode Island, the guidance identifies approximately 200,000 dogs. Using that local estimate, the state’s dog population produces about 100,000 pounds of dog waste per day.
These figures should be read as estimates tied to their sources and locations. The 0.75-pound daily figure from the EPA composting booklet and the 0.5-pound daily figure used in Rhode Island guidance are not interchangeable measurements. Differences may reflect the purpose of the guidance, the population being described, and the way “waste” or “feces” is defined.
City and regional pet-waste totals
Local government figures show how quickly individual amounts become a public sanitation and stormwater issue. The Philadelphia Water Department reports about one dog for every four humans in Philadelphia. It also states that dogs create about 0.75 pounds of waste every day in the city, adding up to tens of millions of pounds every year.
Seattle Public Utilities estimates around 187,000 dogs living in Seattle and around 60,000 outdoor cats. Seattle pets collectively produce about 145,000 pounds of waste daily. The figure includes pets collectively, so it should not be treated as a dog-only total.
Other local estimates use different assumptions. The City of Bellevue says 37.4% of Washington households own dogs, and that the average dog-owning household has 1.5 dogs. Bellevue states that each dog produces 0.25 pounds of solid waste and says this equals about 3.75 tons of raw sewage every day. The City of Eden Prairie says dogs produce up to 4 tons of waste each day.
| Location or example | Reported pet-waste statistic | Source label |
|---|---|---|
| Typical dog | 0.75 pounds per day; 274 pounds per year | EPA Composting Dog Waste booklet |
| Rhode Island | About 100,000 pounds per day from approximately 200,000 dogs | EPA Rhode Island stormwater guidance |
| Seattle | About 145,000 pounds per day from city pets | Seattle Public Utilities |
| Eden Prairie | Up to 4 tons of dog waste per day | City of Eden Prairie |
| Musher with 20 dogs | More than 2 tons annually | EPA Composting Dog Waste booklet |
The EPA Composting Dog Waste booklet also estimates that Fairbanks and Anchorage together produce 20 million pounds of dog waste each year. That is a combined estimate for two cities, not a measurement that can be assigned to each city separately.
What cleanup surveys show
Reported cleanup behavior varies by question, location, and year. In a Northern Virginia regional survey, the share of respondents who said they “always” or “usually” picked up after their dog on walks was 92.4% in 2016, 92.7% in 2017, 92.1% in 2018, and 93.0% in 2019.
The same survey reported lower shares in the following measurement years: 85.0% in 2020, 86.4% in 2021, 87.5% in 2022, 88.7% in 2023, and 87.1% in 2024. These results describe survey responses, not a direct count of every dog walk or every dropped stool.
| Measurement year | Always or usually picked up after a dog on walks |
|---|---|
| 2016 | 92.4% |
| 2017 | 92.7% |
| 2018 | 92.1% |
| 2019 | 93.0% |
| 2020 | 85.0% |
| 2021 | 86.4% |
| 2022 | 87.5% |
| 2023 | 88.7% |
| 2024 | 87.1% |
The Northern Virginia survey also asked about picking up after a dog in the yard daily. The reported shares were 44.6% in 2016, 13.3% in 2017, 12.2% in 2018, 16.0% in 2019, 8.3% in 2020, 8.7% in 2021, 9.9% in 2022, 61.5% in 2023, and 59.9% in 2024. The large change between some years is a reason to keep the measurement years visible rather than treating the values as one continuous trend.
The Philadelphia Water Department reports that about 40% of dog owners say they do not always scoop the poop. That wording differs from the Northern Virginia question, so the two percentages should not be combined or treated as directly comparable.
A Salem survey reported a different response distribution for picking up after a pet: 33% said they always picked up, 38% frequently picked up, 12% rarely picked up, 12% sometimes picked up, and 5% never picked up. The source label for these results is Massachusetts DOER / Salem Sound Coast Watch.
Dog and cat disposal habits
A UK companion-animal survey provides detail about what owners do after collecting waste. Among dog owners, 65.2% said they always picked up their dog’s stool, 1.2% said they never picked it up, and 33.6% said they sometimes or usually picked it up. These are survey responses from the UK study and are not a worldwide estimate.
The same survey found that 94.7% of respondents used a waste bin as their main disposal method for dog poo. Cat-litter disposal was also most commonly associated with a bin: 87% of cat owners said they threw waste litter in the bin. However, 10.1% said they flushed waste litter down the toilet, while 5.9% selected “other” or “don’t know.”
The survey also measured litter-tray use. Among cat owners, 29% said their cat never used a litter tray, 30.5% said their cat always used one, and 40.4% said their cat sometimes used one. These categories describe reported behavior and should not be interpreted as a measurement of the amount of litter produced.
For everyday pet care, the practical distinction is between collecting waste and choosing a disposal route. The reported bin percentages indicate that bins are the dominant method in this survey, while the toilet-flushing figure shows that a minority of respondents used a route with different implications for wastewater systems. The data does not establish that every disposal method is suitable in every local system.
Why pet waste can affect water
The EPA Rhode Island stormwater guidance reports that one gram of dog waste contains 23 million fecal coliform bacteria. The figure is a concentration estimate from that guidance, not a count of all bacteria in an entire stool or all pet waste.
The EPA’s Buzzards Bay TMDL provides a small-watershed example of how repeated deposits can affect recreation. In a small bay watershed, droppings from 100 dogs over two to three days can be enough to temporarily close the bay to swimming and shellfishing. This is a local watershed example and should not be read as a universal closure threshold for every bay.
Pet waste can therefore matter even when a single deposit looks small. The relevant setting may include storm drains, streams, beaches, shellfish waters, or a yard where runoff can move material away from the original location. The supplied local studies describe different places and methods, so their figures are most useful as context for the scale and pathways of the issue.
New York City’s DSNY states that a person can be fined up to $250 for failing to clean up after a dog. The amount is a reported maximum penalty for that jurisdiction, not a general rule for all cities.
How long organisms can persist
The EPA’s Lincoln Urban Pollutant Reduction Strategies identifies a range of survival times for organisms associated with fecal contamination. E. coli in dog waste can survive for months, and the source says three days at 140 degrees Fahrenheit are required to kill it.
Toxocara canis roundworm eggs can survive for four years in soil. Baylisascaris procyonis eggs can survive in moist soil for years. Leptospira interrogans survives for weeks to months in soil or water. Ancylostoma species hookworms survive for several days.
Other reported persistence figures include up to six months for Salmonella species in ruminant feces and at least six months for Cryptosporidium parvum. The source says Giardia can persist for months in water and is resistant to drying, chlorine, and temperature extremes. Campylobacter species are described as being rapidly killed by heat, drying, and freezing.
| Organism or group | Reported persistence or condition | Source label |
|---|---|---|
| E. coli in dog waste | Can survive for months; three days at 140°F required to kill it | EPA Lincoln Urban Pollutant Reduction Strategies |
| Toxocara canis eggs | Four years in soil | EPA Lincoln Urban Pollutant Reduction Strategies |
| Salmonella species | Up to six months in ruminant feces | EPA Lincoln Urban Pollutant Reduction Strategies |
| Cryptosporidium parvum | At least six months | EPA Lincoln Urban Pollutant Reduction Strategies |
| Giardia | Months in water; resistant to drying, chlorine, and temperature extremes | EPA Lincoln Urban Pollutant Reduction Strategies |
| Leptospira interrogans | Weeks to months in soil or water | EPA Lincoln Urban Pollutant Reduction Strategies |
| Baylisascaris procyonis eggs | Years in moist soil | EPA Lincoln Urban Pollutant Reduction Strategies |
| Ancylostoma species | Several days | EPA Lincoln Urban Pollutant Reduction Strategies |
The same EPA source cites CDC estimates of 300,000 cryptosporidiosis cases annually, with 90% of those cases of waterborne origin. It also cites an estimate of 2 million giardiasis cases annually, with 90% of those cases of waterborne origin. Those are disease estimates and waterborne-origin proportions cited by the EPA source; they are not claims that pet waste accounts for those cases.
These persistence statistics explain why cleanup is about more than appearance. Removing waste promptly limits the time it remains available for contact or transport, while local rules and waste systems determine the appropriate disposal method.