[2020 AR] MS4s

2020 Report

Regulated Stormwater- MS4s

All Municipal Separate Storm Sewer Systems (MS4s) in the watershed have adopted stormwater regulations that set water quality requirements, consistent with Regulation 72, for construction and post-construction of new development and redevelopment projects within their jurisdictions.

Further information on each MS4’s program can be found in their annual reports that are to be submitted to the Division by March 10 (Phase II MS4s) and April 1 (Phase I MS4s).

Initially considered a non-point source, regulated stormwater in the Cherry Creek Basin is governed by Regulation 61 and Colorado Discharge Permit COR080000, which includes program requirements specific to water quality. MS4 Permit Holders in the Cherry Creek Basin have developed programs that go above and beyond minimum requirements for other regulated stormwater in the State.

Further information on each MS4’s program can be found in their annual reports in the links below.

MS4 Annual Reports

Find Out More About MS4s

Grass Swale

Above & Beyond

Each of the MS4 permittees in the Cherry Creek Basin have sophisticated programs and projects, as evidenced by the Southeast Metro Stormwater Authority (also called SEMSWA) 2018 Capital Improvement Projects. What CCBWQA calls a Pollutant Reduction Facility, MS4’s call Control Measures.

SEMSWA Projects 2020

2020 Stormwater Permits and Inspections for Construction and Post-Construction Development

* Includes compliance inspections