MS4 Coloring Book

MS4 Coloring Book-1


What Is An “Illicit Discharge”? Federal regulations define an illicit discharge as “…any discharge to an MS4 that is not composed entirely of stormwater…” 

To learn more on illicit discharges, click the link below:

Illicit Discharge Detection and Elimination






What Is Stormwater?

Stormwater is water from rain and melted snow that flows across the ground into the storm sewers found at low points and along the sides of streets. The stormwater flows through a system of pipes and roadside ditches that make up the storm sewer system. The water eventually finds its way to lakes, rivers, streams, wetlands, and the ocean.

What’s The Problem?

Stormwater becomes a problem when it picks up debris, chemicals, dirt and other pollutants which end up in our receiving waters that we use for drinking water and recreation.

What Can You Do To Help?

Properly dispose of hazardous substances such as used oil, cleaning supplies and paint.

Use pesticides, fertilizers, and herbicides properly and efficiently to prevent excess runoff. Avoid blowing grass clippings and leaves into the street. Help keep storm inlets clear of trash and other debris.

Look for signs and other pollutants, such as debris and chemicals, leaving in stormwater runoff or tracked onto roads by construction vehicles. Report poorly managed construction sites that could impact stormwater runoff to our community.

Pick up after your pets and dispose of their waste properly.

Report any discharges from storm system outfalls during times of dry weather. This is a sign that there could be a problem with the storm sewer system.

Install innovative stormwater practices on residential property, such as rain barrels or rain gardens, that capture stormwater and keep it on site instead of letting it drain away into the stormwater system.

For more information, click here


What does it mean to be an MS4 Community?

MS4 Basics


Only Rain in the Drain

Only Rain in the Drain


US Environmental Protection Agency


Northampton County Conservation District


PA Department of Environmental Protection


When It Rains It Drains. Understanding stormwater and how it can affect your money, safety, health and the environment. 

Rain Drain Brochure