Saint Helena Water Quality
Latest water quality information for Saint Helena, California
Last update on March 2025
Unsafe water with serious health risks.
Exceeds 1 EPA limits and 6 recommended standards.
Contaminants exceeding EPA limits
What it means: This refers to substances in the water that are found at levels higher than what the EPA allows. The EPA (Environmental Protection Agency) is a U.S. government agency that sets legal limits for harmful contaminants to protect public health. Exceeding these limits means the water may pose health risks based on federal safety standards.
Odor
6 TONPotential Health Effects
Aesthetic concern
Contaminants exceeding recommended standards
What it means: This refers to substances in the water that are above health-based guidelines set by organizations such as the World Health Organization (WHO) and the U.S. Environmental Protection Agency (EPA). These standards, while not always legally enforceable, are based on scientific research to protect health. Exceeding them may indicate potential health concerns.
Boron
162 ppmPotential Health Effects
Reproductive issues
Bromodichloromethane
7.10 ppbPotential Health Effects
Cancer
Chloroform
45.80 ppbPotential Health Effects
Cancer
Dibromochloromethane
1.10 ppbPotential Health Effects
Cancer
Total Thms
52.80 ppbPotential Health Effects
Cancer
Other Detected Contaminants
| Contaminant | Detected Level | EPA Limit | Recommended | Status |
|---|---|---|---|---|
| Calcium | 12.50 ppm | Not established | 80 ppm | Within limits |
| Chloride | 7.10 ppm | 250 ppm | 250 ppm | Within limits |
| Color | 2.30 CU | 15 CU | 15 CU | Within limits |
| Conductivity | 409 µS/cm | Not established | 800 µS/cm | Within limits |
| Fluoride | 310 ppb | 4000 ppb | 2000 ppb | Within limits |
| Magnesium | 13.10 ppm | Not established | 30 ppm | Within limits |
| Nickel | 10.20 ppb | Not established | 70 ppb | Within limits |
| O Xylene | 0.6000 ppb | 10000 ppb | 10000 ppb | Within limits |
| Ph Level | 4 pH units | 8.50 pH units | 8.50 pH units | Within limits |
| Potassium | 2.60 ppb | Not established | 5000 ppb | Within limits |
| Sodium | 9.20 ppm | Not established | 20 ppm | Within limits |
| Strontium | 150 ppb | Not established | 1500 ppb | Within limits |
| Sulfate | 35.40 ppm | 250 ppm | 250 ppm | Within limits |
| Total Dissolved Solids | 120.90 ppm | 500 ppm | 500 ppm | Within limits |
| Trichlorofluoromethane | 0.9000 ppb | Not established | 1300 ppb | Within limits |
| Zinc | 1.10 ppb | 5000 ppb | 5000 ppb | Within limits |
| No additional contaminants detected. | ||||
How to best protect from water pollution?
Reduce your water pollution exposure in California
Carbon Filter
Carbon filters are effective at removing many common contaminants including chlorine, sediment, volatile organic compounds (VOCs), and improves taste and odor.
Reverse Osmosis
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