Water Quality in WEST COVINA, CA (91791)
EPA violation data for public water systems serving ZIP code 91791.
135
Total Violations
19
Health-Based
116
Monitoring / Reporting
122
Resolved
What does this mean?
122 of 135 violations have been resolved. 19 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 116 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 (135 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| Long Term 2 Enhanced Surface Water Treatment Rule | Health-Based | N/A | N/A | Sep 8, 2025 | Active | N/A |
| Long Term 2 Enhanced Surface Water Treatment Rule | Health-Based | N/A | N/A | Sep 8, 2025 | Active | N/A |
| Long Term 2 Enhanced Surface Water Treatment Rule | Health-Based | N/A | N/A | Jul 17, 2025 | Active | N/A |
| Long Term 2 Enhanced Surface Water Treatment Rule | Health-Based | N/A | N/A | Jul 17, 2025 | Active | N/A |
| Long Term 2 Enhanced Surface Water Treatment Rule | Health-Based | N/A | N/A | Jul 17, 2025 | Active | N/A |
| Consumer Confidence Rule | Monitoring | N/A | N/A | Jun 30, 2025 | Active | N/A |
| Lead and Copper Rule | Monitoring | N/A | N/A | Dec 31, 2024 | Active | N/A |
| Lead and Copper Rule | Monitoring | N/A | N/A | Dec 31, 2024 | Active | N/A |
| Lead and Copper Rule | Monitoring | N/A | N/A | Dec 31, 2024 | Active | N/A |
| Lead and Copper Rule | Monitoring | N/A | N/A | Dec 31, 2024 | Active | N/A |
Lead & Copper Levels
Violation Timeline
2025(6)
Long Term 2 Enhanced Surface Water Treatment Rule
45
Long Term 2 Enhanced Surface Water Treatment Rule
45
Long Term 2 Enhanced Surface Water Treatment Rule
45
Long Term 2 Enhanced Surface Water Treatment Rule
45
Long Term 2 Enhanced Surface Water Treatment Rule
45
Consumer Confidence Rule
72
2024(23)
Lead and Copper Rule
52
Lead and Copper Rule
52
Lead and Copper Rule
52
Lead and Copper Rule
52
Lead and Copper Rule
59
Lead and Copper Rule
59
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Lead and Copper Rule
52
Lead and Copper Rule
52
TTHM
27
TTHM
27
TTHM
27
TTHM
27
Total Haloacetic Acids (HAA5)
27
Total Haloacetic Acids (HAA5)
27
Total Haloacetic Acids (HAA5)
27
Total Haloacetic Acids (HAA5)
27
TTHM
02
TTHM
02
TTHM
02
TTHM
02
How Does This Compare?
WEST COVINA (91791) has 135 recorded violations, including 19 health-based. 13 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
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 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.