Pet Waste

Be the solution and help Stop Poo-llution in San Mateo County!

Pets bring joy and companionship, but their waste can create environmental challenges when not managed properly. A single gram of dog waste can contain 23 million bacteria!

When pet waste is left on the ground, it can be washed into storm drains by rain or runoff, eventually making its way to streams, creeks, the San Francisco Bay or the Pacific Ocean. While certain types of ‘poop’ can make good fertilizer, dog waste in particular does not. For most plants it is actually too acidic, due to their diets, which often causes burning and browning if left on plants and grasses for too long.

Why is it important?

person signing Scoop the Poop pledge at San Mateo County Sustainability Department water protection booth at a community event

Pet waste is a significant source of pollution that can affect both human health and the environment. According to the EPA, the bacteria found in pet waste can lead to illnesses such as salmonellosis, toxocariasis, and toxoplasmosis. These pathogens can be transmitted through contaminated soil, water, or direct contact, which creates risks to both people and wildlife, especially aquatic wildlife. Children and those with compromised immune systems playing in parks or in waterways are at greater risk.

How You Can Help

Addressing pet waste is a key step in maintaining good water quality, and everyone can participate.

pet disposal station at waterfront park location

Pick it up and bag it!

Always carry poop bags to clean up after your dog. Dispose of the bag in a proper trash receptacle—leaving bags in parks or trails is considered littering and may result in fines. Promptly picking up waste helps prevent soil and water contamination. Although plastic bags are not environmentally ideal, the pollution from untreated pet waste poses a greater environmental hazard. Landfills are designed to manage waste safely.

Take the Scoop the Poop Pledge

green waste bin with red X indicating no pet waste in green bin or compost

Do Not Compost Pet Waste!

Pet waste is not suitable for composting. It contains parasites and pathogens that can pose health risks. Stick to putting it in the trash to ensure safety.

Consider All Pets!

Clean up after all household pets, including cats and other animals. Keeping our community and waterways clean is a shared responsibility.

Featured Resource

De Anza trail at Junipero Sera Park in San Mateo County allows dogs on leash

Pet Friendly Parks in San Mateo County

Many parks and trails in San Mateo County welcome dogs on leash, including Coyote Point Recreation Area, Junipero Serra Park, and Pillar Point Bluff. For a full list of County parks and trails, visit smcgov.org/dogs-at-SMC-parks.