The Southeast Metro Stormwater Authority (SEMSWA) is responsible for stormwater services as well as various drainage and flood control facilities within its service area, which contains the City of Centennial, developed areas of western unincorporated Arapahoe County and a small portion of Douglas County.

The Southeast Metro Stormwater Authority (SEMSWA) was formed on September 19, 2006 by an intergovernmental agreement between the City of Centennial, County of Arapahoe, Arapahoe County Water & Wastewater Authority, East Cherry Creek Valley Water and Sanitation District and Inverness Water and Sanitation District.  SEMSWA is a political subdivision and a public corporation of the State, falling under the guidelines of Colorado State statute for a "drainage authority" (29-1-204.2 C.R.S.).

SEMSWA reviews and approves various plans and reports for storm water compliance through the planning and development process. These plans and reports include but are not limited to: 

  • Land use cases
  • Construction documents
  • Drainage plans and reports
  • Grading, erosion and sediment control plans and reports
  • Floodplain development

SEMSWA is responsible for managing the City of Centennial's federally mandated MS-4 permit as well as enforcing the various drainage and storm water regulations and ensuring that the applicant is aware of them. For more information, visit SEMSWA or call (303) 858-8844.

Quick Contact Info:

City of Centennial
13133 East Arapahoe Road
Centennial, CO  80112

(303) 325-8000 - 24 Hour Citizen Response Center
(720) 488-0933 - Fax Number



ADA Notice

Contact Us

City of Centennial
Powered by Real Time Solutions - Website Design & Document Management