COUNTY SERVICE AREA 7
PWSID: CA4100509 · Redwood City, CA · Serves 300 people
According to EPA Safe Drinking Water Information System (SDWIS), COUNTY SERVICE AREA 7 (PWSID CA4100509) in Redwood City, CA is listed as a CWS water system covering about 300 people. The same extract lists 7 health-based violation records spanning 2017-2025. Those 7 health-based rows for COUNTY SERVICE AREA 7 cover contaminants such as TTHM, Total Haloacetic Acids (HAA5); they remain historical EPA registry entries, not a current compliance or drinkability score.
COUNTY SERVICE AREA 7 has 7 health-based violation records in this historical extract. Monitoring and reporting records are not included.
PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 2 distinct EPA contaminant codes appear in this system's record, including TTHM, Total Haloacetic Acids (HAA5). Recorded violations span 2017–2025. Day-to-day primacy enforcement for this system runs through the California drinking-water program, not EPA directly.
A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the California state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- CA4100509
- System Type
- CWS
- Water Source
- Surface Water
- Location
- Redwood City, CA
- Population Served
- 300
- Health Violations
- Yes (7)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| TTHM | 4 | 4 |
| Total Haloacetic Acids (HAA5) | 3 | 3 |
Violation History (7)
| Contaminant | Health | Date |
|---|---|---|
| Total Haloacetic Acids (HAA5) | Yes | Jan 1, 2025 |
| Total Haloacetic Acids (HAA5) | Yes | Jan 1, 2025 |
| Total Haloacetic Acids (HAA5) | Yes | Jan 1, 2020 |
| TTHM | Yes | Apr 1, 2018 |
| TTHM | Yes | Jan 1, 2018 |
| TTHM | Yes | Oct 1, 2017 |
| TTHM | Yes | Jul 1, 2017 |
Frequently Asked Questions
What does EPA SDWIS list for COUNTY SERVICE AREA 7?
How many people does COUNTY SERVICE AREA 7 serve?
What violations does COUNTY SERVICE AREA 7 have?
What contaminants have been found in COUNTY SERVICE AREA 7 water?
Compare beyond California
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest COUNTY SERVICE AREA 7 on cumulative violation count (7) and EPA-reported population served (300). Violation-count peers include SANTEE UTILITY COMMISSION, CHEFORNAK WATER SYSTEM, LYNN WATER WORKS.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Nearby Water Systems
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About This Data
COUNTY SERVICE AREA 7 (CA4100509) is drawn from EPA SDWIS. Nearby county systems in this extract include SFPUC CITY DISTRIBUTION DIVISION; CITY OF DALY CITY; CITY OF REDWOOD CITY; CITY OF SAN BRUNO. Health-based rows (7 MCL/TT) are historical registry state, not a current drinkability score.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.