Poor Water Quality
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
40.0
|
15 ppb | 1 ppb | Exceeded |
| Copper |
1521.0
|
1300 ppb | 300 ppb | Exceeded |
Water Quality Summary
Tap water quality in Saint Helena, California (94574) receives an overall grade of D (Poor) with a score of 51 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 30 points below the California state average of 81. Compared to the national average (75), this area scores significantly lower. The area is served by 4 water systems providing water to approximately 6,328 people, using surface water and groundwater sources. Testing has found elevated levels of Lead, Copper that warrant attention. Over the past 5 years, water systems here have accumulated 23 violations, including 17 health-based violations.
A score of 51/100 signals poor water quality in Saint Helena, CA. Significant issues have been identified, which may include multiple violations, contaminant levels near or above regulatory limits, or PFAS contamination. We recommend reviewing the detailed contaminant data below, considering a certified water filter, and checking your utility's Consumer Confidence Report for the latest information.
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.
Copper can leach into water from copper plumbing, especially in newer homes or when water is acidic.
Short-term exposure above 1,300 ppb can cause gastrointestinal distress. Long-term exposure may cause liver or kidney damage. People with Wilson's disease are especially vulnerable.
Copper pipes, fittings, and faucets are the most common source. Corrosive (low-pH) water accelerates copper leaching.
If copper levels are elevated, flush pipes by running water for 15–30 seconds before use. Reverse osmosis and distillation systems effectively remove copper.
Common Questions
Tap water in Saint Helena, California receives a grade of D (Poor) with a score of 51/100. This indicates significant water quality concerns based on violation history, contaminant levels, or enforcement actions. We recommend reviewing the specific contaminants detected below and considering a certified water filter.
ZIP code 94574 is served by 4 water systems using surface water, groundwater sources, providing water to approximately 6,328 people. Multiple source types mean your water may come from a blend of surface and underground sources.
Yes — lead levels in Saint Helena, California are 40.0 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.
No PFAS ("forever chemicals") were detected in water systems serving Saint Helena, California during the most recent EPA monitoring period (UCMR5). However, not all water systems have been tested for all PFAS compounds, and new contamination can occur over time.
Water systems serving Saint Helena, California have received 23 violations in the last 5 years, including 17 health-based violations. 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, copper), residents in Saint Helena, California should consider: NSF/ANSI 53 certified filter — specifically rated for lead reduction. Pitcher filters (like Brita Longlast or PUR) and under-sink systems both work. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.
Explore Nearby