Improving Stormwater Management

Too much rain, not absorbed into the ground, becomes stormwater runoff. This can cause flooding. Stormwater runoff is also one of the major causes of water pollution in Chester County. Pollutants such as soil and automotive fluid are carried off in the runoff. This polluted runoff is not treated and flows to the nearest stream. Improving the management of stormwater runoff can be accomplished in two key steps:
  • find ways to increase the amount of rainwater that can be absorbed into the ground (at home, your business and in your community) and 
  • prevent pollutants from entering the water.       
For more information, check out the resources below.   


PA Act 167 Stormwater Management Plan 

  • The Pennsylvania Stormwater Management Act of 1978 (PA Act 167) requires counties to prepare stormwater management plans for all watersheds within the county. As of July 2, 2013, Act 167 plans have been completed and approved for all of Chester County's watersheds. The approved Act 167 Plans in Chester County include plans for five individual watersheds and the most recent plan covers the entire county. Click here for more information.

Public Education Brochures


The County's MS4 Stormwater Program

  • The County Of Chester is required, similar to municipalities, under the Pennsylvania Department of Environmental Protection's Municipal Separate Storm Sewer System (MS4), to obtain a permit to discharge stormwater from their storm sewer system to waters of the Commonwealth. The purpose of this permit program is to eliminate or minimize the impacts from County operations and facilities on the water quality of our streams and waterways. To learn more about Chester County's MS4 Stormwater Program, click here.

Links to Useful Stormwater Sites

County-wide Act 167 Stormwater Management Plan Model Ordinance
(PADEP Approved July 2, 2013)

This Model Ordinance presents a comprehensive compilation of components necessary for effective stormwater management, and it reflects a moderate level of restrictions in its numeric standards. The components included are based on technically sound principles and represent the best and most responsive balance of inputs received from a wide range of technical resources and stakeholders. Act 167 requires that within 6 months following PADEP approval of the County-wide Act 167 Stormwater Management Plan, all Chester County municipalities adopt the ordinance requirements included in the Plan.