Stormwater Management

Wilton's Stormwater Program

Wilton riverscapeThe purpose of the EPA’s Municipal Separate Storm Sewer System (MS4) Program is to mitigate the effects of storm water pollution.

Rainwater that falls on paved streets, lawns, parking lots, and sidewalks becomes polluted stormwater. The more impervious the surface, the more stormwater runoff and impact to receiving water bodies. Typical pollutants in stormwater are trash, oil, fertilizers, sediment, sand, and bacteria. In fact, 40% of known pollution to the nation’s waters is caused by stormwater.

Wilton must comply with the requirements of MS4, and we have submitted a Notice of Intent (NOI) to comply. The links section of this page provides more details on our plans.

We have six ways we are working to clean up the stormwater in Wilton before it reaches our beautiful riverways.

1. Education

Get the Scoop on Poop! - Information from our Spokes-pooch for Dog Owners
Get Pumped! - Information for Homeowners with Septic Systems
Green Grass Clear Water - Information on how to maintain a healthy lawn and a healthy river

2. Public Involvement


DrainStorm drain stenciling! - 10 students from High Mowing High School and two adults led the effort to stencil the storm drains in Wilton.  Approximately 30 storm drains were stenciled in an afternoon. This gentle reminder helps keep solid waste out of the waterways of Wilton.


Town-wide clean up - residents picked up over 73 bags of trash and solid waste.  Residents picked up blue bags and gloves at various locations in Wilton including Town Hall.  On  clean up day, blue bags were gathered and transported to the Recycling Center by our Emergency Services Director, Dave Boissonnault.  Participants were encouraged to post photos on social media with the #hashtag  #NHMS4 and #Wilton4Stormwater.


LogoMichele Decoteau, Stormwater Manager was on the Podcast: Before the Checks are Signed on March 4, 2020, discussing stormwater and the MS4 Permit. Listen here!


The presentation summarizes Wilton’s stormwater program plans and was approved at the Select Board meeting on October 22, 2018. Wilton's Stormwater Program presentation

3. Illicit Discharge Detection and Elimination (IDDE) - coming soon!

IDDE regulations
SSO Inventory
Stormwater system mapping

4. Stormwater Management at Construction Sites

Stormwater regulations for new construction - Section H of the Wilton Land Use Regulations addresses stormwater for new construction. 

5. Post Construction Stormwater Management - coming soon!

Stormwater regulations for Post -construction
Green infrastructure

6. Good Housekeeping

Operation and Maintenance for Town-owned properties

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