pet waste

Reduce Stormwater

One of the main culprits of water pollution in the watershed is stormwater runoff. When rain falls on hard surfaces it washes a number of pollutants into storm drains including: bacteria and parasites from pet waste chemicals from fertilizer, pesticides, herbicides Phosphorous from leaves and grass clippings snow/ice melt chemicals and sand motor oil, antifreeze, […]

Community Water Monitoring Network

The Community Water Monitoring Network or “CWMN” is an Environmental Protection Agency-approved, volunteer-based approach to water quality monitoring that has been running at NepRWA for over 20 years. Covid-19 update: We have developed procedures that will allow CWMN to proceed safely for both volunteers and staff by ensuring compliance with current Commonwealth and CDC social […]

Action Plan

Our mission is to protect the water, wildlife and land of the Neponset River and Watershed. Local People, Local Solutions Since 1967, the members, volunteers and staff of Neponset River Watershed Association have led, and continue to lead, an extraordinarily successful campaign to clean up and protect our water, waterways, and watershed lands. We bring […]

Stormwater BMPs

Several different methods can be used when treating polluted stormwater runoff. Stormwater Runoff As water flows over impervious surfaces, like driveways, sidewalks, and streets, it gets contaminated as it picks up debris, chemicals, dirt, and other pollutants left on the ground. This polluted water then flows into catch basins or storm sewer systems and is […]

Neponset River: 2020 Town Water Quality Reports

  August 10, 2021– Since 1996, the Neponset River Watershed Association (NepRWA) has been collecting water quality data from throughout the Watershed. Samples are collected by volunteers through the Community Water Monitoring Network (CWMN). Every month (May-Oct) volunteers pick up sampling equipment and head to their sites at 6 am to collect water samples.  Some […]

August CWMN Update

Our August water quality results show the harmful effect that polluted stormwater runoff has on the river.

Keep Those Storm Drains Clear!

As you begin to rake your leaves, please consider that any leaves that are left on the pavement can clog storm drains and flood your neighborhood.

Harmful Algal Bloom in Lake Massapoag: Aug 29

Update: Sept. 10, 2019 – 11:28am – Lake Massapoag in Sharon is reopened for all water activities From the Sharon Board of Health: Test results confirmed that there are no harmful levels of blue-green algae. We thank the residents for their patience this past week. August 29, 2019 — Press release from Sharon, MA Board […]

RiverFest 2019 was COOL!

Believe it or not, we are already planning for RiverFest 2020! Please email if you wish to get involved. Although July 20 proved to be one of the hottest days of the summer, it didn’t stop staff and exhibitors from setting up alongside the Neponset River for a day of fun. While the heat […]


NepRWA’s core mission is to protect the water, wildlife and land of the Neponset River Watershed. To carry out this mission, we not only work with individual communities to educate about ways to each of us can ensure clean water and prevent wasteful water use, but we also advocate for changes in public policy. Why […]

Fall Cleanup 2018

Thanks to everyone who helped with the Neponset River Fall Cleanup!

The Kids are Alright!

Students around the Neponset Watershed are learning about real world water issues and doing their part to get the message across.

Neponset River Fall Cleanup 2017

Over 150 people showed up on Sept. 23 to help with the Annual Neponset River Cleanup, including many community volunteers from Hyde Park and all across the watershed. It was a team effort We owe a lot of thanks to our cleanup volunteers, beginning with our Hyde Park planning committee and our incredible group of […]