CHICO, CA · Colusa County
DEL ORO WATER CO.-WALNUT RANCH Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of December 15, 2015. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.
If you are a resident looking for your current water provider, see water systems in Colusa County, CA.
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.
System facts
- System ID (PWSID)
- CA0600011
- System type
- Community Water System
- Population served
- 182
- Service connections
- 78
- Ownership
- local government
- Water source
- groundwater (wells)
Violation history
Maximum Contaminant Level Violation, Average
Health-basedArsenic
July 1, 2010 – September 30, 2010
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
April 1, 2010 – June 30, 2010
ResolvedNotification, Public
—No contaminant on record
December 1, 1982 – December 31, 1982
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
October 30, 1980 – October 29, 1981
Archived
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| July 1, 2010 – September 30, 2010 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| April 1, 2010 – June 30, 2010 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| December 1, 1982 – December 31, 1982 | Notification, Public | — | — | Archived |
| October 30, 1980 – October 29, 1981 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- July 15, 2010State Administrative/Compliance Order without penalty issued19 linked violations
Last known contact on file (system is inactive)
FORTINO, ROBERT
530-809-3970
CHICO, CA 95927