Water Quality in SAN FRANCISCO, CA (94104)
EPA violation data for public water systems serving ZIP code 94104.
19
Total Violations
4
Health-Based
15
Monitoring / Reporting
19
Resolved
What does this mean?
19 of 19 violations have been resolved. 4 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 15 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.
Violations Detail (19 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Health-Based | N/A | N/A | Jan 31, 2025 | Resolved | N/A |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Health-Based | N/A | N/A | Jan 31, 2025 | Resolved | N/A |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Health-Based | N/A | N/A | Jan 31, 2025 | Resolved | N/A |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Health-Based | N/A | N/A | Jan 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Aug 31, 2024 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Aug 31, 2024 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Aug 31, 2024 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Aug 31, 2024 | Resolved | N/A |
| Surface Water Treatment Rule | Monitoring | N/A | N/A | Aug 31, 2024 | Resolved | N/A |
| Surface Water Treatment Rule | Monitoring | N/A | N/A | Aug 31, 2024 | Resolved | N/A |
Lead & Copper Levels
Violation Timeline
2025(4)
Stage 1 Disinfectants and Disinfection Byproducts Rule
12
Stage 1 Disinfectants and Disinfection Byproducts Rule
12
Stage 1 Disinfectants and Disinfection Byproducts Rule
12
Stage 1 Disinfectants and Disinfection Byproducts Rule
12
2024(12)
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Surface Water Treatment Rule
36
Surface Water Treatment Rule
36
Surface Water Treatment Rule
36
Surface Water Treatment Rule
36
Chlorine
27
Chlorine
27
Chlorine
27
Chlorine
27
How Does This Compare?
SAN FRANCISCO (94104) has 19 recorded violations, including 4 health-based. All violations have been resolved, which is a positive sign for current water quality. Consider testing your tap water independently for added peace of mind.
Recommended Water Filters
Based on the contaminants detected in your area, these filter types may help improve your water quality.
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) certified
Always look for filters certified by NSF International for the specific contaminants you want to remove.