The Southeast Metro Stormwater Authority (SEMSWA) provides Stormwater Management Services to property owners in the City of Centennial, unincorporated Arapahoe County*, and a small portion of northern Douglas County**. SEMSWA’s purpose is to: • Protect people and property from flooding • Comply with federal environmental regulations • Provide a funding mechanism for stormwater services SEMSWA was formed in 2006 by an Intergovernmental Agreement among the following entities: • City of Centennial • Arapahoe County • Arapahoe Water and Waste Water Authority • East Cherry Creek Valley Water and Sanitation District • Inverness Water and Sanitation District