Duncans Mills Water Quality

Latest water quality information for Duncans Mills, California

Last update on March 2025

Very bad

Unsafe water with serious health risks.

Exceeds 2 EPA limits and 10 recommended standards.

Water Provider

sweetwater springs cwd - monte rio

Owner Type

L (Local Government)

Population Served

3,000

Data Sources

2010-2024

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.

Dibromochloropropane

0.3000 ppb

1.5x

EPA limits: 0.2000 ppb

Above EPA regulatory threshold

Potential Health Effects

Cancer

Ethylene Dibromide

0.2000 ppb

4.0x

EPA limits: 0.0500 ppb

Above EPA regulatory threshold

Potential Health Effects

Cancer

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.

Boron

58.20 ppm

116.4x

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

1.60 ppb

3.2x

Recommended: 0.5000 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Chloroform

0.9000 ppb

2.2x

Recommended: 0.4000 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Dibromochloromethane

1.80 ppb

18.0x

Recommended: 0.1000 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Silica

31 ppm

1.2x

Recommended: 25 ppm

Above health-based recommendations

Potential Health Effects

None

Total Thms

5.60 ppb

37.3x

Recommended: 0.1500 ppb

Above health-based recommendations

Potential Health Effects

Cancer

Other Detected Contaminants

Contaminant	Detected Level	EPA Limit	Recommended	Status
Barium	106.80 ppb	2000 ppb	2000 ppb	Within limits
Calcium	17.90 ppm	Not established	80 ppm	Within limits
Chloride	27.60 ppm	250 ppm	250 ppm	Within limits
Color	15 CU	15 CU	15 CU	Within limits
Conductivity	363.10 µS/cm	Not established	800 µS/cm	Within limits
Copper	299.70 ppb	1300 ppb	300 ppb	Within limits
Fluoride	175.70 ppb	4000 ppb	2000 ppb	Within limits
Molybdenum	0.1000 ppb	Not established	40 ppb	Within limits
Ph Level	7.50 pH units	8.50 pH units	8.50 pH units	Within limits
Potassium	1.10 ppb	Not established	5000 ppb	Within limits
Sodium	17.10 ppm	Not established	20 ppm	Within limits
Strontium	141.60 ppb	Not established	1500 ppb	Within limits
Total Dissolved Solids	224.60 ppm	500 ppm	500 ppm	Within limits
Trichlorofluoromethane	0.9000 ppb	Not established	1300 ppb	Within limits
Zinc	218.60 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.