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Tap water quality report

Calistoga, CA

EPA monitoring detected 23 contaminants across the 2 water suppliers serving Calistoga. 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
5,810
people served
23
contaminants found
California rankings Lead in California PFAS in California

What was found in Calistoga'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
Fluoride
189.5 µg/L 4.7%
of the EPA limit 4000 µg/L
Highest in the city: TUCKER ACRES MUTUAL WATER CO. · 200 people · 2019
1/2 SYR4
Nitrate
170 µg/L 1.7%
of the EPA limit 10000 µg/L
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
TTHM
108.5 µg/L 136%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
2/2 SYR4
Chloroform
89.2 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
79.225 µg/L 132%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Trichloroacetic Acid
50.5 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Barium
49 µg/L 2.5%
of the EPA limit 2000 µg/L
Highest in the city: TUCKER ACRES MUTUAL WATER CO. · 200 people · 2019
1/2 SYR4
Dichloroacetic Acid
33.92 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Bromodichloromethane
22.7 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Chromium
13 µg/L 13%
of the EPA limit 100 µg/L
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Arsenic
11 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Highest in the city: TUCKER ACRES MUTUAL WATER CO. · 200 people · 2019
1/2 SYR4
Dibromochloromethane
9.9 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Monochloroacetic Acid
9.345 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Bromoform
1.95 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Dibromoacetic Acid
1.84 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Copper
1.4 µg/L 0.1%
of the EPA limit 1300 µg/L
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Beryllium, Total
0.1400 µg/L 3.5%
of the EPA limit 4 µg/L
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2019
1/2 SYR4
Thallium, Total
0.1200 µg/L 6%
of the EPA limit 2 µg/L
Highest in the city: TUCKER ACRES MUTUAL WATER CO. · 200 people · 2019
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2022
Highest in the city: 0.0140 mg/L — TUCKER ACRES MUTUAL WATER CO. · 200 people · 2026
2/2 LCR
PFOS
0.0122 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2025
1/2 UCMR-5
PFOA
0.0064 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2025
1/2 UCMR-5
Pfpea
0.0042 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2025
1/2 UCMR-5
Pfhxa
0.0032 µg/L
No EPA limit set
Main supplier: CALISTOGA, CITY OF · 5,610 people · 2025
1/2 UCMR-5
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 Calistoga

SupplierPopulation served
CALISTOGA, CITY OF 5,610
TUCKER ACRES MUTUAL WATER CO. 200

Frequently asked questions about Calistoga tap water

Is Calistoga tap water safe to drink?

EPA testing detected 23 contaminants in the water serving Calistoga. 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 Calistoga?

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

What contaminants are in Calistoga's water?

The contaminants EPA monitoring detected in Calistoga include Fluoride, Nitrate, TTHM, Chloroform, Total Haloacetic Acids (HAA5). 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.