FOSTER CITY, CA · San Mateo County
ESTERO MUNICIPAL IMPROVEMENT DISTRICT 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)
- CA4110021
- System type
- Community Water System
- Population served
- 36,556
- Service connections
- 8,035
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
Violation history
Monitoring and Reporting (DBP)
—TTHM
July 1, 2022 – September 30, 2022
ResolvedTreatment Technique (SWTR and GWR)
Health-basedSurface Water Treatment Rule
April 1, 1992 – April 13, 1992
ResolvedNotification, Public
—No contaminant on record
August 1, 1987 – August 31, 1987
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, 2022 – September 30, 2022 | Monitoring and Reporting (DBP) | TTHM | — | Resolved |
| April 1, 1992 – April 13, 1992 | Treatment Technique (SWTR and GWR) | Surface Water Treatment Rule | Health-based | Resolved |
| August 1, 1987 – August 31, 1987 | Notification, Public | — | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- February 21, 2023State Compliance achieved4 linked violations
Contact
DANISH, ZAHEED
650-520-4620
FOSTER CITY, CA 94404