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Tap water quality report

Muir Beach, CA

EPA monitoring detected 15 contaminants across the 2 water suppliers serving Muir Beach. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
411
people served
15
contaminants found
California rankings Lead in California PFAS in California

What was found in Muir Beach's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
1200 µg/L 12%
of the EPA limit 10000 µg/L
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2019
2/2 SYR4
Fluoride
367 µg/L 9.2%
of the EPA limit 4000 µg/L
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2017
Highest in the city: 485.5 µg/L — GREEN GULCH FARM · 75 people · 2019
2/2 SYR4
Barium
150 µg/L 7.5%
of the EPA limit 2000 µg/L
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2017
Highest in the city: 200 µg/L — GREEN GULCH FARM · 75 people · 2019
2/2 SYR4
TTHM
32.2 µg/L 40%
of the EPA limit 80 µg/L
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
2/2 SYR4
Bromoform
8.56 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
Highest in the city: 15.27 µg/L — GREEN GULCH FARM · 75 people · 2019
2/2 SYR4
Dibromochloromethane
13.8 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
2/2 SYR4
Total Haloacetic Acids (HAA5)
10.7 µg/L 18%
of the EPA limit 60 µg/L
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
2/2 SYR4
Bromodichloromethane
8.26 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
2/2 SYR4
Monochloroacetic Acid
7.07 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
2/2 SYR4
Dibromoacetic Acid
3.324 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
Highest in the city: 4.946 µg/L — GREEN GULCH FARM · 75 people · 2019
2/2 SYR4
Chloroform
4.32 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
1/2 SYR4
Dichloroacetic Acid
2.778 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
1/2 SYR4
Trichloroacetic Acid
2.65 µg/L
No EPA limit set
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2018
1/2 SYR4
Arsenic
2.2 µg/L 22%
of the EPA limit 10 µg/L
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2017
1/2 SYR4
Lead
0.0100 mg/L 67%
of the EPA limit 0.0150 mg/L
Main supplier: MUIR BEACH COMMUNITY · 336 people · 2023
2/2 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Muir Beach

SupplierPopulation served
MUIR BEACH COMMUNITY 336
GREEN GULCH FARM 75

Frequently asked questions about Muir Beach tap water

Is Muir Beach tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Muir Beach. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Muir Beach?

2 public water suppliers report drinking-water monitoring for Muir Beach, California to the EPA. Each is listed above with its population served.

What contaminants are in Muir Beach's water?

The contaminants EPA monitoring detected in Muir Beach include Nitrate, Fluoride, Barium, TTHM, Bromoform. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.