Tomales Water Quality
Latest water quality information for Tomales, California
Last update on March 2025
Not legally unsafe but concerning.
Exceeds 0 EPA limits and 12 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.
Arsenic
0.2000 ppbPotential Health Effects
Cancer
Boron
151 ppmPotential Health Effects
Reproductive issues
Bromodichloromethane
6 ppbPotential Health Effects
Cancer
Bromoform
1.10 ppbPotential Health Effects
Cancer
Cadmium
0.2000 ppbPotential Health Effects
Kidney damage, cancer
Chloroform
12.40 ppbPotential Health Effects
Cancer
Dibromochloromethane
3.70 ppbPotential Health Effects
Cancer
Lead
0.5000 ppbPotential Health Effects
Neurotoxicity
Lead Level
0.5000 ppbPotential Health Effects
Neurotoxicity
Sodium
24.10 ppmPotential Health Effects
Hypertension
Thallium
0.2000 ppbPotential Health Effects
Organ damage, neurotoxicity
Total Thms
22.80 ppbPotential Health Effects
Cancer
Other Detected Contaminants
| Contaminant | Detected Level | EPA Limit | Recommended | Status |
|---|---|---|---|---|
| Antimony | 0.5000 ppb | 6 ppb | 1 ppb | Within limits |
| Barium | 54.50 ppb | 2000 ppb | 2000 ppb | Within limits |
| Calcium | 18.30 ppm | Not established | 80 ppm | Within limits |
| Chloride | 38.10 ppm | 250 ppm | 250 ppm | Within limits |
| Cobalt | 0.5000 ppb | Not established | 70 ppb | Within limits |
| Conductivity | 341 µS/cm | Not established | 800 µS/cm | Within limits |
| Copper | 84.40 ppb | 1300 ppb | 300 ppb | Within limits |
| Fluoride | 55.90 ppb | 4000 ppb | 2000 ppb | Within limits |
| Magnesium | 12.70 ppm | Not established | 30 ppm | Within limits |
| Manganese | 1.10 ppb | 50 ppb | 50 ppb | Within limits |
| Molybdenum | 0.1000 ppb | Not established | 40 ppb | Within limits |
| Nickel | 2.50 ppb | Not established | 70 ppb | Within limits |
| Odor | 1.20 TON | 3 TON | 3 TON | Within limits |
| Ph Level | 7.40 pH units | 8.50 pH units | 8.50 pH units | Within limits |
| Potassium | 1.80 ppb | Not established | 5000 ppb | Within limits |
| Selenium | 0.4000 ppb | 50 ppb | 30 ppb | Within limits |
| Silica | 16 ppm | Not established | 25 ppm | Within limits |
| Silver | 0.3000 ppb | 100 ppb | 100 ppb | Within limits |
| Strontium | 177 ppb | Not established | 1500 ppb | Within limits |
| Sulfate | 11.80 ppm | 250 ppm | 250 ppm | Within limits |
| Total Dissolved Solids | 177 ppm | 500 ppm | 500 ppm | Within limits |
| Vanadium | 0.2000 ppb | 21 ppb | 21 ppb | Within limits |
| Zinc | 49.10 ppb | 5000 ppb | 5000 ppb | Within limits |
| No additional contaminants detected. | ||||
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Reverse osmosis systems can remove up to 99% of dissolved contaminants from water including heavy metals, fluoride, nitrates, and arsenic.