Within the City of Centennial, the Southeast Metro Stormwater Authority (SEMSWA) is the responsible agency that reviews and approves stormwater plans, grading and erosion control plans, and is the City’s designated Floodplain Administrator.

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.

Flood Awareness

Flooding isn't only caused by rain. Flooding can also occur from melting snow, inadequate drainage systems and failed dams. What this means to you:

  • Every property is at risk for flooding. Properties located in a floodplain are high risk and are more susceptible to flooding. Flooding is the nation's number one natural disaster. 
  • Flooding can happen anywhere and at any time, including in areas along smaller creeks and streams that are not shown on any flood map. Even streets can flood.
  • The Federal Emergency Management Agency (FEMA) has not mapped all floodplain areas. 

Know Your Flood Risk

Contact the Southeast Metro Stormwater Authority (SEMSWA) for flood map information.

If your property is in the floodplain, you need to know:

  • You should consider flood insurance; homeowner's insurance does not cover flooding.
  • Any improvements to your property within the floodplain require a floodplain development permit.  Contact SEMSWA for permitting information.

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

 

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