The #1 cause of water pollution in the Neponset River Watershed is polluted stormwater runoff. This website is a resource to help residents, business owners, property managers, commercial and industrial entities, and municipal employees reduce stormwater pollution. For any questions, please email Suzanna Sullivan, Water Stewardship Manager at the Neponset River Watershed Association, at


Dog waste contains harmful bacteria that can pollute local waterways — and if not picked up can pose a health threat to swimmers, wildlife, and water quality.

  • Picking up after your dog helps prevent disease, protects your local water resources, and keeps the beaches open!
  • Whenever you’re out with your dog, carry a plastic bag to pick up any waste—and dispose of it in a trash can.

It’s a lot of poop!

According to the Environmental Protection Agency (EPA), the average dog produces approximately ¾ pound of waste per day!

The EPA also estimate that two or three days’ worth of droppings from a population of about 100 dogs would contribute enough bacteria to temporarily close a bay and all watershed areas within 20 miles of it to swimming and shell fishing.

Improperly maintained septic systems also impact water quality

Poorly maintained septic systems may leak and release an overload of nutrients and pathogens (bacteria and viruses), which can eventually enter our waterways and create public health problems. Learn more…

And fertilizers can cause problems, too!

Improperly applied fertilizer can easily wash into local waterways through storm drain systems and cause problems in local streams and ponds. Fertilizers cause algae to grow, which can deplete oxygen, hurt aquatic wildlife, and make boating, fishing, and swimming unpleasant. Learn more…


The #1 cause of water pollution in the Neponset River Watershed is polluted stormwater runoff.

Polluted stormwater happens when bacteria, chemicals, and trash get washed into storm drains from impervious surfaces, like streets, driveways, parking lots; industrial sites, and construction sites.

After the polluted runoff enters our storm drains, it empties — untreated — into local streams and ponds and affects our drinking water resources, swimming, boating, fishing, wildlife, and fish habitats.

The Neponset Stormwater Partnership (NSP) is a regional cooperation and resource-sharing program in the Neponset Watershed that was formed to help reduce the water quality problems caused by polluted stormwater runoff.

NSP partners include the towns of Avon, Canton, Dedham, Foxborough, Medfield, Milton, Norwood, Quincy, Randolph, Sharon, Stoughton, Walpole, and Westwood, along with the Metropolitan Area Planning Council (MAPC).

Learn more about polluted stormwater.

Read below to learn how you can help to reduce stormwater pollution in your community.


Make simple changes around your home. Limit lawn chemical use and always pick up after your dog!


Maintain the area around your property and follow guidelines to reduce contaminants.


Protect your business and your clients by installing construction site stormwater best management practices.


Take steps to reduce or eliminate the cause of polluted runoff to minimize the risk of costly clean-ups.

Report a Problem. Ask a Question.

Seen dumping in a storm drain? Spotted pollution in a waterway? Have a stormwater question?

Email us at, or give us a call at 781-575-0354 x 300. If we can’t solve the problem or answer the question on the spot, we will relay it to the appropriate agency for further action.

The NSP is Managed by NepRWA

The Neponset Stormwater Partnership is managed by the Neponset River Watershed Association (NepRWA), a non-profit grass-roots organization founded in 1967, with a mission to protect and restore the natural resources of the Neponset River, its tributaries, and surrounding watershed lands for the benefit of present and future generations.

You can learn more about NepRWA and the programs they manage at

For more information about the NSP, contact NepRWA Managing Director for Community Resilience, Kerry Snyder, (781) 575-0354 x300