CALIFORNIA WATER SERVICE-S SAN FRANCISCO Water Quality Report
Population
64,146
people served
Water Source
🌊 Surface
rivers, lakes, reservoirs
National Rank
Top 43%
of 49,184 US systems
5-Year Record
✅ Clean
no violations
A
Safe
Safety Grade
0 violations in the past 5 years, including 3 health-based
System Details
- PWSID
- CA4110009
- Population Served
- 64,146
- Water Source
- Surface Water
- Owner
- Private
- State
- California
- EPA Region
- 9
Contaminants of Concern
| Contaminant | Status | Violations |
|---|---|---|
| Contaminant 3100 | ✕ Health-Based | 3 |
| Total Coliform | ⚠ Monitoring/Reporting | 1 |
Violation History
2013
1
1992
3
Total violations on record: 4
Service Area
Cities Served
ZIP Codes Served
Recommended Water Filters
Based on contaminants detected in this water system:
UV Water Purifier
Kills bacteria and viruses without chemicals
Removes: Total Coliform
How does this compare?
This systemNational average
Grade A
Avg: B-C
4violations total
14% of national average
National avg: ~28 per system
📍 Mid-to-large system — serves 10× the national average.