Fair Water Quality
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
41.0
|
15 ppb | 1 ppb | Exceeded |
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFOS | 26.0 ppt | 4 ppt | 4 ppt | Exceeded |
| PFHxS | 22.0 ppt | 10 ppt | 10 ppt | Exceeded |
| PFOS | 12.0 ppt | 4 ppt | 4 ppt | Exceeded |
| PFHxS | 9.8 ppt | 10 ppt | 10 ppt | Below limit |
| PFBA | 6.3 ppt | No standard | 500 ppt | Unregulated |
| PFBS | 6.1 ppt | 2000 ppt | 100 ppt | Below limit |
| PFOA | 5.1 ppt | 4 ppt | 4 ppt | Exceeded |
| PFOA | 4.8 ppt | 4 ppt | 4 ppt | Exceeded |
Water Quality Summary
Tap water quality in Pleasanton, California (94566) receives an overall grade of C (Fair) with a score of 55 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 26 points below the California state average of 81. Compared to the national average (75), this area scores significantly lower. The area is served by 5 water systems providing water to approximately 138,777 people, using surface water and groundwater sources. Testing has found elevated levels of Lead that warrant attention. Notably, 5 PFAS compounds exceed EPA limits — a significant concern given the persistent nature of these chemicals. Over the past 5 years, water systems here have accumulated 2 violations, including 1 health-based violations.
A score of 55/100 indicates fair water quality in Pleasanton, CA. While the water meets minimum federal standards, there are noteworthy concerns — either elevated contaminant levels approaching regulatory limits, a moderate violation history, or both. Residents may want to review specific contaminant data and consider targeted filtration, especially for sensitive groups like children and pregnant women.
Health Information
Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.
Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.
Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.
If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.
Common Questions
Tap water in Pleasanton, California receives a grade of C (Fair) with a score of 55/100. While it generally meets minimum federal standards, there are some areas of concern including violation history or elevated contaminant levels. Sensitive populations (children, pregnant women, elderly) may want to consider additional filtration.
ZIP code 94566 is served by 5 water systems using surface water, groundwater sources, providing water to approximately 138,777 people. Multiple source types mean your water may come from a blend of surface and underground sources.
Yes — lead levels in Pleasanton, California are 41.0 ppb, which exceeds the EPA action level of 15 ppb. This is a serious concern. We strongly recommend using a certified lead-removal filter for all drinking and cooking water, and having your water independently tested.
Yes — 14 PFAS compounds were detected in water serving Pleasanton, California, and 5 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 Pleasanton, California have received 2 violations in the last 5 years, including 1 health-based violation. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Based on detected contaminants (lead, PFAS), residents in Pleasanton, 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.