Colusa County, California Water Systems

Colusa County, California

11 community water systems on record — 9 active, 2 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 California’s official records. Always confirm current status with California before making decisions based on this information.

Community water systems in Colusa County, California

System name	City	Population served	Status
ARBUCKLE PUBLIC UTILITY DISTRICT	ARBUCKLE	2,778	Active
CITY OF COLUSA	COLUSA	6,447	Active
CITY OF WILLIAMS	WILLIAMS	5,538	Active
COLUSA CO. SERVICE AREA #1-CENTURY RANCH	CITY OF COLUSA	246	Active
COLUSA CO. SERVICE AREA #2-STONYFORD	CITY OF COLUSA	250	Active
COLUSA CO. WWD #1 - GRIMES	GRIMES	512	Active
COLUSA CO. WWD #2 - PRINCETON	PRINCETON	382	Active
COLUSA MOBILE TRAILER PARK	COLUSA	140	Inactive
DEL ORO WATER CO.-WALNUT RANCH	CHICO	182	Inactive
DEL ORO WC - ARBUCKLE DISTRICT	CHICO	185	Active
MAXWELL PUBLIC UTILITY DISTRICT	MAXWELL	1,175	Active