Good Water Quality
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFOS | 16.0 ppt | 4 ppt | 4 ppt | Exceeded |
| PFPeA | 15.0 ppt | No standard | — | Unregulated |
| PFHxA | 13.0 ppt | No standard | 400 ppt | Unregulated |
| PFOS | 13.0 ppt | 4 ppt | 4 ppt | Exceeded |
| PFBA | 9.5 ppt | No standard | 500 ppt | Unregulated |
| PFBA | 8.6 ppt | No standard | 500 ppt | Unregulated |
| PFBA | 7.3 ppt | No standard | 500 ppt | Unregulated |
| PFOA | 7.0 ppt | 4 ppt | 4 ppt | Exceeded |
Water Quality Summary
Tap water quality in La Mirada, California (90638) receives an overall grade of B (Good) with a score of 84 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is roughly in line with the California state average of 81. The area is served by 3 water systems providing water to approximately 166,014 people, using surface water and groundwater sources. Notably, 4 PFAS compounds exceed EPA limits — a significant concern given the persistent nature of these chemicals. The area has a clean violation record over the past 5 years — a positive indicator of consistent water quality management.
A score of 84/100 means the water in La Mirada, CA is generally good and meets EPA standards, with only minor areas of concern. There may be low levels of detectable contaminants or a small number of non-critical violations. Most residents can feel comfortable with their tap water quality, though basic filtration can provide an extra layer of protection.
Common Questions
Based on EPA data, tap water in La Mirada, California receives a grade of B (Good) with a score of 84/100. This indicates the water meets federal standards and has relatively few concerns. However, individual homes may still have localized issues such as lead from old plumbing.
ZIP code 90638 is served by 3 water systems using surface water, groundwater sources, providing water to approximately 166,014 people. Multiple source types mean your water may come from a blend of surface and underground sources.
No lead data is currently available for ZIP code 90638. This may mean lead testing results haven't been reported recently, or the serving water system uses monitoring waivers. You can request a free lead test kit from most water utilities or purchase a certified home testing kit.
Yes — 15 PFAS compounds were detected in water serving La Mirada, California, and 4 exceed EPA maximum contaminant levels. PFAS are persistent chemicals linked to cancer, immune system effects, and developmental issues. A reverse osmosis or activated carbon filter certified for PFAS removal is recommended.
Water systems serving La Mirada, California have zero violations in the last 5 years. This is a positive indicator of consistent regulatory compliance and water quality management.
Based on detected contaminants (PFAS), residents in La Mirada, California should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.
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