San Joaquin Water Quality
Latest water quality information for San Joaquin, California
Last update on March 2025
Unsafe water with serious health risks.
Exceeds 2 EPA limits and 11 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.
Turbidity
1.10 NTUPotential Health Effects
Infection risk
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
3 ppbPotential Health Effects
Cancer
Boron
511 ppmPotential Health Effects
Reproductive issues
Bromodichloromethane
0.5000 ppbPotential Health Effects
Cancer
Bromoform
2.50 ppbPotential Health Effects
Cancer
Dibromochloromethane
0.6000 ppbPotential Health Effects
Cancer
Silica
40 ppmPotential Health Effects
None
Sodium
90 ppmPotential Health Effects
Hypertension
Total Thms
2.80 ppbPotential Health Effects
Cancer
Uranium
2.70 ppbPotential Health Effects
Cancer, kidney damage
Other Detected Contaminants
| Contaminant | Detected Level | EPA Limit | Recommended | Status |
|---|---|---|---|---|
| Aluminum | 52.60 ppb | 200 ppb | 600 ppb | Within limits |
| Calcium | 12.90 ppm | Not established | 80 ppm | Within limits |
| Chloride | 39.80 ppm | 250 ppm | 250 ppm | Within limits |
| Conductivity | 448.60 µS/cm | Not established | 800 µS/cm | Within limits |
| Fluoride | 960 ppb | 4000 ppb | 2000 ppb | Within limits |
| Magnesium | 2.70 ppm | Not established | 30 ppm | Within limits |
| Manganese | 5.50 ppb | 50 ppb | 50 ppb | Within limits |
| Mercury | 0.3000 ppb | 2 ppb | 1.20 ppb | Within limits |
| Molybdenum | 7.30 ppb | Not established | 40 ppb | Within limits |
| Potassium | 3.70 ppb | Not established | 5000 ppb | Within limits |
| Strontium | 140.20 ppb | Not established | 1500 ppb | Within limits |
| Sulfate | 88.90 ppm | 250 ppm | 250 ppm | Within limits |
| Total Dissolved Solids | 262 ppm | 500 ppm | 500 ppm | Within limits |
| Zinc | 29.40 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.