ANGWIN, CA · Napa County
LA TIERRA HEIGHTS MUTUAL Water System
Current status
No open violations on record as of July 4, 2026.
This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.
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)
- CA2800525
- System type
- Community Water System
- Population served
- 67
- Service connections
- 19
- Ownership
- privately owned
- Water source
- groundwater (wells)
Violation history
Monitoring, Routine (RTCR)
—Revised Total Coliform Rule
October 1, 2022 – December 31, 2022
ResolvedFollow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
July 1, 2020 – June 22, 2021
ResolvedFollow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
October 1, 2019 – September 7, 2020
ResolvedMonitoring, Regular
—Nitrate
January 1, 2019 – December 31, 2019
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
August 1, 2014 – August 31, 2014
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
February 1, 2006 – February 28, 2006
ResolvedNotification, Public
—No contaminant on record
September 1, 1984 – September 30, 1984
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 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 |
|---|---|---|---|---|
| October 1, 2022 – December 31, 2022 | Monitoring, Routine (RTCR) | Revised Total Coliform Rule | — | Resolved |
| July 1, 2020 – June 22, 2021 | Follow-up Or Routine LCR Tap M/R | Lead and Copper Rule | — | Resolved |
| October 1, 2019 – September 7, 2020 | Follow-up Or Routine LCR Tap M/R | Lead and Copper Rule | — | Resolved |
| January 1, 2019 – December 31, 2019 | Monitoring, Regular | Nitrate | — | Resolved |
| August 1, 2014 – August 31, 2014 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
| February 1, 2006 – February 28, 2006 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
| September 1, 1984 – September 30, 1984 | Notification, Public | — | — | Archived |
| October 1, 1981 – September 30, 1982 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | 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
- June 22, 2021State Compliance achieved5 linked violations
- February 20, 2020State Administrative/Compliance Order without penalty issued2 linked violations
- March 28, 2006State Compliance achieved3 linked violations
Contact
COX, KEN
707-965-2874
ANGWIN, CA 94508