COUNTY SERVICE AREA 7
PWS ID: CA4100509 · REDWOOD CITY, California 94063
Population Served
300
Total Violations
84
Health-Based Violations
13
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 68
- County
- San Mateo
- School/Daycare
- No
- MCL Violations
- 12
- Monitoring Violations
- 45
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 8 | 2018 |
| Total Haloacetic Acids (HAA5) | MCL | 4 | 2025 |
| Toluene | MR | 2 | 2004 |
| Benzene | MR | 2 | 2004 |
| Ethylbenzene | MR | 2 | 2004 |
| DICHLOROMETHANE | MR | 2 | 2004 |
| Tetrachloroethylene | MR | 2 | 2004 |
| 1,1,1-Trichloroethane | MR | 2 | 2004 |
| 1,1,2-Trichloroethane | MR | 2 | 2004 |
| 1,2-Dichloroethane | MR | 2 | 2004 |
| o-Dichlorobenzene | MR | 2 | 2004 |
| 1,2-Dichloropropane | MR | 2 | 2004 |
| p-Dichlorobenzene | MR | 2 | 2004 |
| Vinyl chloride | MR | 2 | 2004 |
| Styrene | MR | 2 | 2004 |
| Xylenes, Total | MR | 2 | 2004 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| Carbon tetrachloride | MR | 2 | 2004 |
| CHLOROBENZENE | MR | 2 | 2004 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2004 |
| trans-1,2-Dichloroethylene | MR | 2 | 2004 |
| 1,1-Dichloroethylene | MR | 2 | 2004 |
| Trichloroethylene | MR | 2 | 2004 |
| cis-1,2-Dichloroethylene | MR | 2 | 2004 |
| Lead and Copper Rule | MR | 1 | 1993 |
| Surface Water Treatment Rule | TT | 1 | 1992 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.