San Francisco, CA 94129
2 water systems • 5,000 residents
Poor water quality - filtration recommended
Score: 32/100
Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.
Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts
23
Contaminants Detected
244
Violations on Record
32
Health-Based Violations
0
Recent Violations
Grade Breakdown
32 / 100 points
Recommended Water Filters
- ✓Point-of-Use Carbon Filter (NSF-certified for lead)
- ✓Reverse Osmosis or Ion Exchange Filter
- ✓Ultraviolet (UV) Purification
- ✓Whole Home Carbon Filter System
Consult a water quality specialist for personalized recommendations.
San Francisco vs CA & National Average
Detected Contaminants
23 contaminants detected across water systems serving this ZIP code
| Contaminant | Category |
|---|---|
| Nitrate | Agricultural |
| Antimony, Total | Heavy Metal |
| Arsenic | Heavy Metal |
| Barium | Heavy Metal |
| Beryllium, Total | Heavy Metal |
| Cadmium | Heavy Metal |
| Chromium | Heavy Metal |
| Lead and Copper Rule | Heavy Metal |
| Mercury | Heavy Metal |
| Nickel | Heavy Metal |
| Selenium | Heavy Metal |
| Thallium, Total | Heavy Metal |
| CYANIDE | Inorganic |
| Fluoride | Inorganic |
| Coliform (TCR) | Microorganism |
| Revised Total Coliform Rule | Microorganism |
| Carbofuran | Other |
| Consumer Confidence Rule | Other |
| OXAMYL | Other |
| Pentachlorophenol | Other |
| Surface Water Treatment Rule | Other |
| Total Polychlorinated Biphenyls (PCB) | Other |
| Gross Alpha, Excl. Radon and U | Radiological |
Water System Information
- Systems Serving This ZIP:
- PRESIDIO OF SAN FRANCISCO, JOSHUA VALLEY UTILITY COMPANY
- Population Served:
- 5,000
- Systems With Violations:
- 2 of 2
- Major Violations:
- 135
- Enforcement Actions:
- 227
Frequently Asked Questions
What does the grade mean?
Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.
Is my tap water safe to drink?
Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.
How often is the data updated?
We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.
What filters do you recommend?
Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.