Mendota Water Quality

Latest water quality information for Mendota, California

Last update on March 2025

Very bad

Unsafe water with serious health risks.

Exceeds 1 EPA limits and 10 recommended standards.

Water Provider

mendota, city of

Owner Type

L (Local Government)

Population Served

11,404

Data Sources

2014-2023

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.

Ph Level

9.50 pH units

1.1x

EPA limits: 8.50 pH units

Above EPA regulatory threshold

Potential Health Effects

Skin/eye irritation

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

1.30 ppb

325.0x

Recommended: 0.004000 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Boron

334.70 ppm

669.4x

Recommended: 0.5000 ppm

Above health-based recommendations

Potential Health Effects

Reproductive issues

Bromodichloromethane

1.20 ppb

20.0x

Recommended: 0.0600 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Bromoform

15.50 ppb

31.0x

Recommended: 0.5000 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Chloroform

0.5000 ppb

1.2x

Recommended: 0.4000 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Dibromochloromethane

4.10 ppb

41.0x

Recommended: 0.1000 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Magnesium

793.30 ppm

26.4x

Recommended: 30 ppm

Above health-based recommendations

Potential Health Effects

Diarrhea

Sodium

62.50 ppm

3.1x

Recommended: 20 ppm

Above health-based recommendations

Potential Health Effects

Hypertension

Total Thms

23.80 ppb

158.7x

Recommended: 0.1500 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Other Detected Contaminants

Contaminant	Detected Level	EPA Limit	Recommended	Status
Aluminum	52.20 ppb	200 ppb	600 ppb	Within limits
Calcium	5.30 ppm	Not established	80 ppm	Within limits
Chloride	33.90 ppm	250 ppm	250 ppm	Within limits
Conductivity	288.80 µS/cm	Not established	800 µS/cm	Within limits
Fluoride	366.70 ppb	4000 ppb	2000 ppb	Within limits
Mercury	0.3000 ppb	2 ppb	1.20 ppb	Within limits
Molybdenum	4 ppb	Not established	40 ppb	Within limits
Potassium	726.70 ppb	Not established	5000 ppb	Within limits
Silica	21.90 ppm	Not established	25 ppm	Within limits
Specific Conductivity	498 µmhos/cm	Not established	800 µmhos/cm	Within limits
Strontium	91.70 ppb	Not established	1500 ppb	Within limits
Sulfate	36.70 ppm	250 ppm	250 ppm	Within limits
Total Dissolved Solids	361.60 ppm	500 ppm	500 ppm	Within limits
Turbidity	0.3000 NTU	1 NTU	0.3000 NTU	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.