Water Quality in OAKLEY, CA (94561)
EPA violation data for public water systems serving ZIP code 94561.
44
Total Violations
41
Health-Based
3
Monitoring / Reporting
41
Resolved
What does this mean?
41 of 44 violations have been resolved. 41 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 3 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 (44 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | Health-Based | N/A | N/A | Oct 16, 2024 | Active | N/A |
| LEAD AND COPPER RULE REVISIONS | Monitoring | N/A | N/A | Oct 16, 2024 | Active | N/A |
| Arsenic | Health-Based | N/A | 0.011 | Sep 30, 2024 | Resolved | Skin damage; circulatory system problems; increased risk of cancer |
| Arsenic | Health-Based | N/A | 0.012 | Sep 30, 2024 | Resolved | Skin damage; circulatory system problems; increased risk of cancer |
| Arsenic | Health-Based | N/A | 0.013 | Sep 30, 2024 | Resolved | Skin damage; circulatory system problems; increased risk of cancer |
| Arsenic | Health-Based | N/A | 0.011 | Jun 30, 2024 | Resolved | Skin damage; circulatory system problems; increased risk of cancer |
| Arsenic | Health-Based | N/A | 0.013 | Jun 30, 2024 | Resolved | Skin damage; circulatory system problems; increased risk of cancer |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | May 31, 2024 | Resolved | N/A |
| Arsenic | Health-Based | N/A | 0.011 | Mar 31, 2024 | Resolved | Skin damage; circulatory system problems; increased risk of cancer |
| Arsenic | Health-Based | N/A | 0.012 | Mar 31, 2024 | Resolved | Skin damage; circulatory system problems; increased risk of cancer |
Lead & Copper Levels
Violation Timeline
2024(10)
LEAD AND COPPER RULE REVISIONS
2E
LEAD AND COPPER RULE REVISIONS
4G
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Revised Total Coliform Rule
3A
Arsenic
02
Arsenic
02
2023(11)
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
Arsenic
02
How Does This Compare?
OAKLEY (94561) has 44 recorded violations, including 41 health-based. 3 remain unresolved. 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.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
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.