Hydrohistorian
Water providers in Douglas County, Colorado
Who is my water provider?
Type a Colorado address, or use your location. This names the community water systems whose EPA service-area boundary contains that point.
Blue is a boundary a utility or county traced; amber is one EPA modelled from census places. Click an area for the system. Systems with no boundary on file are in the table but not on the map.
Towns in Douglas County
Each names the systems whose service area covers it.
- Castle Pines
- Castle Pines Village
- Castle Rock
- Highlands Ranch
- Larkspur
- Lone Tree
- Louviers
- Meridian
- Meridian Village
- Parker
- Perry Park
- Roxborough Park
- Sedalia
- Sierra Ridge
- Stepping Stone
- Stonegate
- The Pinery
- Westcreek
Every community water system in Douglas County
Common questions
How many water providers are in Douglas County, Colorado?
27 community water systems serve Douglas County, Colorado. The largest is Town of Castle Rock, which reports serving 110,298 people.
Who is my water provider in Douglas County?
It depends on your address: 27 community systems serve parts of Douglas County. Enter an address in the lookup on this page and it will name the systems whose EPA service-area boundary contains that point.
Why is a system in Douglas County missing from the map?
3 of the 27 systems here have no service-area boundary in EPA's file, so they cannot be drawn. They are still in the table on this page, with their source and compliance record.
Nearby counties
Systems and counties from EPA SDWIS federal reporting, fetched 2026-09-08; boundaries from EPA's Community Water System Service Area Boundaries (v3, 2026). A county row here is the county SDWIS files for the system, which is where it serves customers, not necessarily where its intakes are. Report a problem →