Portola Valley Water Quality
Latest water quality information for Portola Valley, California
Last update on March 2025
Acceptable water with improvement potential.
Exceeds 0 EPA limits and 7 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
Bromodichloromethane
1 ppbPotential Health Effects
Cancer
Chloroform
21.30 ppbPotential Health Effects
Cancer
Lead
1 ppbPotential Health Effects
Neurotoxicity
Lead Level
1 ppbPotential Health Effects
Neurotoxicity
Total Thms
23.50 ppbPotential Health Effects
Cancer
Turbidity
0.4000 NTUPotential Health Effects
Infection risk
Other Detected Contaminants
| Contaminant | Detected Level | EPA Limit | Recommended | Status |
|---|---|---|---|---|
| Aluminum | 45.60 ppb | 200 ppb | 600 ppb | Within limits |
| Barium | 12.70 ppb | 2000 ppb | 2000 ppb | Within limits |
| Calcium | 8.20 ppm | Not established | 80 ppm | Within limits |
| Chlorate | 82.50 ppb | Not established | 210 ppb | Within limits |
| Chloride | 7.50 ppm | 250 ppm | 250 ppm | Within limits |
| Cobalt | 0.5000 ppb | Not established | 70 ppb | Within limits |
| Conductivity | 93.70 µS/cm | Not established | 800 µS/cm | Within limits |
| Copper | 48.50 ppb | 1300 ppb | 300 ppb | Within limits |
| Fluoride | 646 ppb | 4000 ppb | 2000 ppb | Within limits |
| Iron | 66.80 ppb | 300 ppb | 300 ppb | Within limits |
| Magnesium | 2.20 ppm | Not established | 30 ppm | Within limits |
| Manganese | 4.20 ppb | 50 ppb | 50 ppb | Within limits |
| Molybdenum | 0.5000 ppb | Not established | 40 ppb | Within limits |
| Nickel | 4 ppb | Not established | 70 ppb | Within limits |
| Odor | 3 TON | 3 TON | 3 TON | Within limits |
| Ph Level | 8.40 pH units | 8.50 pH units | 8.50 pH units | Within limits |
| Selenium | 0.2000 ppb | 50 ppb | 30 ppb | Within limits |
| Silica | 5.40 ppm | Not established | 25 ppm | Within limits |
| Sodium | 11 ppm | Not established | 20 ppm | Within limits |
| Strontium | 72.20 ppb | Not established | 1500 ppb | Within limits |
| Sulfate | 10.30 ppm | 250 ppm | 250 ppm | Within limits |
| Total Dissolved Solids | 70.70 ppm | 500 ppm | 500 ppm | Within limits |
| Zinc | 53.40 ppb | 5000 ppb | 5000 ppb | Within limits |
| No additional contaminants detected. | ||||
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