Mill Valley Water Quality
Latest water quality information for Mill Valley, California
Last update on March 2025
Acceptable water with improvement potential.
Exceeds 0 EPA limits and 9 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.
Good news! No contaminants were found to exceed EPA limits.
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.
Atrazine
0.2000 ppbPotential Health Effects
Endocrine disruption
Boron
106.80 ppmPotential Health Effects
Reproductive issues
Bromodichloromethane
6.20 ppbPotential Health Effects
Cancer
Chloroform
13.40 ppbPotential Health Effects
Cancer
Dibromochloromethane
2.60 ppbPotential Health Effects
Cancer
Hexachlorobenzene
0.2000 ppbPotential Health Effects
Cancer
Lindane
0.1000 ppbPotential Health Effects
Neurotoxicity, cancer
Polychlorinated Biphenyls
0.2000 ppbPotential Health Effects
Cancer
Total Thms
22.90 ppbPotential Health Effects
Cancer
Other Detected Contaminants
| Contaminant | Detected Level | EPA Limit | Recommended | Status |
|---|---|---|---|---|
| Alachlor | 0.4000 ppb | 2 ppb | 2 ppb | Within limits |
| Calcium | 13.90 ppm | Not established | 80 ppm | Within limits |
| Chlorate | 29.10 ppb | Not established | 210 ppb | Within limits |
| Chloride | 16.90 ppm | 250 ppm | 250 ppm | Within limits |
| Conductivity | 265.70 µS/cm | Not established | 800 µS/cm | Within limits |
| Dalapon | 5.20 ppb | 200 ppb | 200 ppb | Within limits |
| Dinoseb | 0.8000 ppb | 7 ppb | 7 ppb | Within limits |
| Fluoride | 655.30 ppb | 4000 ppb | 2000 ppb | Within limits |
| Hexachlorocyclopentadiene | 0.5000 ppb | 50 ppb | 2 ppb | Within limits |
| Magnesium | 10.50 ppm | Not established | 30 ppm | Within limits |
| Molybdenum | 0.1000 ppb | Not established | 40 ppb | Within limits |
| Nickel | 6.20 ppb | Not established | 70 ppb | Within limits |
| Pentachlorophenol | 0.1000 ppb | 1 ppb | 0.3000 ppb | Within limits |
| Ph Level | 6.70 pH units | 8.50 pH units | 8.50 pH units | Within limits |
| Picloram | 0.3000 ppb | 500 ppb | 166 ppb | Within limits |
| Potassium | 1.30 ppb | Not established | 5000 ppb | Within limits |
| Silvex | 0.4000 ppb | 50 ppb | 50 ppb | Within limits |
| Sodium | 18.80 ppm | Not established | 20 ppm | Within limits |
| Specific Conductivity | 184.40 µmhos/cm | Not established | 800 µmhos/cm | Within limits |
| Strontium | 139.60 ppb | Not established | 1500 ppb | Within limits |
| Sulfate | 17.40 ppm | 250 ppm | 250 ppm | Within limits |
| Total Dissolved Solids | 137.80 ppm | 500 ppm | 500 ppm | Within limits |
| Zinc | 188.70 ppb | 5000 ppb | 5000 ppb | Within limits |
| No additional contaminants detected. | ||||
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