Dewey County, South Dakota Water Systems

Dewey County, South Dakota

11 community water systems on record — 5 active, 6 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace South Dakota’s official records. Always confirm current status with South Dakota before making decisions based on this information.

Community water systems in Dewey County, South Dakota

System name	City	Population served	Status
CHEYENNE RIVER WATER AUTHORITY	EAGLE BUTTE	60	Inactive
CHEYENNE RIVER WATER AUTHORITY	EAGLE BUTTE	94	Inactive
CHEYENNE RIVER WATER AUTHORITY	EAGLE BUTTE	75	Inactive
CHEYENNE RIVER WATER AUTHORITY	EAGLE BUTTE	150	Inactive
CHEYENNE RIVER WATER AUTHORITY	EAGLE BUTTE	65	Inactive
CHEYENNE RIVER WATER AUTHORITY	EAGLE BUTTE	26	Inactive
EAGLE BUTTE	EAGLE BUTTE	4,000	Active
ISABEL	ISABEL	145	Active
T C & G RURAL WATER SYSTEM	MOBRIDGE	166	Active
TIMBER LAKE	TIMBER LAKE	499	Active
TRI-COUNTY RURAL WATER SYSTEM	EAGLE BUTTE	2,190	Active