Mammoth Lakes Water Quality
Latest water quality information for Mammoth Lakes, California
Last update on March 2025
Acceptable water with improvement potential.
Exceeds 0 EPA limits and 5 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
1.50 ppbPotential Health Effects
Cancer
Bromodichloromethane
0.6000 ppbPotential Health Effects
Cancer
Chloroform
11.80 ppbPotential Health Effects
Cancer
Silica
48 ppmPotential Health Effects
None
Total Thms
12.40 ppbPotential Health Effects
Cancer
Other Detected Contaminants
| Contaminant | Detected Level | EPA Limit | Recommended | Status |
|---|---|---|---|---|
| Calcium | 5.70 ppm | Not established | 80 ppm | Within limits |
| Magnesium | 4.40 ppm | Not established | 30 ppm | Within limits |
| Molybdenum | 2.40 ppb | Not established | 40 ppb | Within limits |
| Nickel | 5.50 ppb | Not established | 70 ppb | Within limits |
| Ph Level | 7.60 pH units | 8.50 pH units | 8.50 pH units | Within limits |
| Strontium | 34 ppb | Not established | 1500 ppb | Within limits |
| Total Dissolved Solids | 78 ppm | 500 ppm | 500 ppm | Within limits |
| Zinc | 155 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
Reverse osmosis systems can remove up to 99% of dissolved contaminants from water including heavy metals, fluoride, nitrates, and arsenic.