
Keeping Our Waterways Clean
Stormwater pollution in San Mateo County is an issue that affects creeks, San Francisco Bay, and the Pacific Ocean. Stormwater is runoff from rain, snowmelt, and irrigation that flows over surfaces like roads and sidewalks without soaking into the ground. Stormwater runoff in San Mateo County enters storm drains and travels underground to local creeks and waterways before eventually reaching the San Francisco Bay or the Pacific Ocean—without being treated at a water treatment facility.
As a result, pollutants such as trash, oil, soaps, pet waste, sewage, automotive fluids, construction materials, paint, sediment, and even food waste can contaminate our waterways, harming both aquatic and human life. To protect water quality, it is strictly prohibited to dump, spill, or discharge these pollutants into the storm drain system. Preventing stormwater pollution is a shared responsibility, and everyone can take part.
How to Prevent Stormwater Pollution
Together we can keep our waterways clean.
Pick Up After Pets
Stop poo-llution by making sure to carry pet waste bags on walks and using them to bag pet waste and dispose the waste into a garbage bin. Pet waste can carry bacteria that is harmful to both humans and other animals. This small act helps keep our public spaces clean and protects waterways.

Pick Up Trash
Make sure trash, recycling, compost, and yard waste are properly secured in bins and disposed of correctly to prevent litter from washing into storm drains. Simple things like making sure there is a lid on bins when put out for pick up, or bagging trash securely can go a long way in keeping our road and water ways trash free.

Pick Eco-Friendly Products
Consider choosing products with minimal packaging or those that use recycled materials to further decrease environmental impact. Additionally, support brands that prioritize sustainability in their manufacturing processes. By making these conscious choices, you contribute to a healthier planet and encourage industries to adopt more eco-friendly practices

Tarp Your Load
Litter and debris placed in truck beds can end up in local waterways and harm wildlife especially if not properly covered and secured. Not only does this practice help protect the environment, but it also ensures safety for other drivers. Loose debris can become hazardous projectiles.
Learn More About Keeping our Waterways Clean
Everyone can help prevent stormwater pollution.
San Mateo County Watersheds
A watershed is the area of land where all the water drains into a particular creek, bay, or ocean. Everyone lives in a watershed, and activities in this area can impact water and habitat quality for wildlife and people. Pollution in one part of a watershed can affect areas downstream. Human actions—whether positive or negative—can influence the health of a watershed, including the water quality, wildlife, vegetation, and overall quality of life. In San Mateo County, most stormwater runoff eventually travels from storm drains and creeks and flows into the San Francisco Bay or the Pacific Ocean.
Use this map to find out what watershed your home, office, or school is in.
Integrated Pest Management Policy
Integrated Pest Management (IPM) is an ecosystem-based approach aimed at long-term pest prevention through techniques such as biological controls, mechanical controls, cultural controls, and reduced-risk chemicals. Under the San Mateo Countywide Water Pollution Prevention Program Model Integrated Pest Management (IPM) Policy (PDF), pesticides are applied only when necessary with a focus on targeting specific pests while minimizing risks to human health and the environment. This strategy applies to various County-managed properties, including parks, roadsides, and municipal buildings.