Stormwater Management

The rivers and streams in Hanover are nature's natural drainage system.  All precipitation falling from the sky is either absorbed into the ground or runs into a river or stream, eventually ending up in the Drinkwater River, Indian Head River, Third Herring Brook, North River, and ultimately flowing out to sea.  Man-made development impacts these rivers and streams, causing stormwater to flow more rapidly into the rivers and streams than nature intended.  This rapid flow picks up contaminants that impact the natural ecosystems as well as the Town's drinking water.  We rely upon nature for our very survival.  In order to preserve the delicate balance of these fragile ecosystems,  we all need to do our part to minimize man's impact on the natural order.

Stormwater Image 1


As an operator of a municipally separate storm sewer system (MS4), the Town of Hanover has both a moral and a legal obligation under the Federal Clean Water Act to control the quantity of pollutants and quality of stormwater being discharged into the rivers and streams from our catch basins.  The drainage systems in neighborhoods are designed to treat the stormwater as best they can before discharging the water to the streams.  In the neighborhoods built since the 1980s, there are often large man-made retention ponds that are designed to both control the rate of flow of the discharge as well as separate out solids that may have been washed into the drainage system.  This is just one way that we are doing our part to minimize man's impact on the environment as a result of development.  In fact, we have a comprehensive stormwater management program with many best management practices (BMP's), all of which are designed to incrementally improve the rivers and streams.  One component of our plan is to partner with the local watershed association, the North and South Rivers Watershed Association (NSRWA), to help advance the goal of cleaner rivers and streams.

Stormwater Image 2

How can you help?

While the Town has a specific ongoing program for stormwater management, we encourage everyone living, working, or travelling through Hanover to do your part to minimize your personal impact on the environment.  It isn't hard. Collectively, little changes in our daily habits and lifestyles will have major positive impacts on the environment.  Only by working together will we sustain a healthy environment for generations to come.  It is important both for our survival and for an overall improvement to our quality of life.

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Stormwater Management Plan

NPDES Reports

To see what the Town of Hanover has done over the past few years to improve the quality of our stormwater discharges, please click on the following annual stormwater reports: 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019

NPDES Permit Notice of Intent

2018 Town of Hanover Small MS4 General Permit Notice of Intent


Questions / Comments

Please direct any questions or comments to the Department of Public Works at