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Tap water quality report

Alpine, CA

EPA monitoring detected 15 contaminants across the 2 water suppliers serving Alpine. 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
9,700
people served
15
contaminants found
California rankings Lead in California PFAS in California

What was found in Alpine'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
6596 µg/L 66%
of the EPA limit 10000 µg/L
Main supplier: Viejas Community System · 9,600 people · 2019
Highest in the city: 13275 µg/L — WILLOWSIDE TERRACE WATER ASSOCIATION · 100 people · 2019
2/2 SYR4
Fluoride
304 µg/L 7.6%
of the EPA limit 4000 µg/L
Main supplier: Viejas Community System · 9,600 people · 2018
1/2 SYR4
Barium
57.99999999999999 µg/L 2.9%
of the EPA limit 2000 µg/L
Main supplier: Viejas Community System · 9,600 people · 2018
1/2 SYR4
TTHM
25.85 µg/L 32%
of the EPA limit 80 µg/L
Main supplier: Viejas Community System · 9,600 people · 2019
1/2 SYR4
Lithium
21.4 µg/L
No EPA limit set
Main supplier: Viejas Community System · 9,600 people · 2024
1/2 UCMR-5
Combined Uranium
19.860449999999997 µg/L 66%
of the EPA limit 30 µg/L
Main supplier: Viejas Community System · 9,600 people · 2016
2/2 SYR4
Toluene
18 µg/L 1.8%
of the EPA limit 1000 µg/L
Main supplier: Viejas Community System · 9,600 people · 2018
1/2 SYR4
Gross Alpha, Excl. Radon And U
5.477999999999999 pCi/L 37%
of the EPA limit 15 pCi/L
Main supplier: Viejas Community System · 9,600 people · 2016
1/2 SYR4
Arsenic
5.279999999999999 µg/L 53%
of the EPA limit 10 µg/L
Main supplier: Viejas Community System · 9,600 people · 2018
1/2 SYR4
Total Haloacetic Acids (HAA5)
4.909999999999999 µg/L 8.2%
of the EPA limit 60 µg/L
Main supplier: Viejas Community System · 9,600 people · 2019
1/2 SYR4
Dichloromethane
2.3 µg/L 46%
of the EPA limit 5 µg/L
Main supplier: Viejas Community System · 9,600 people · 2018
1/2 SYR4
Selenium
2.14 µg/L 4.3%
of the EPA limit 50 µg/L
Main supplier: Viejas Community System · 9,600 people · 2018
1/2 SYR4
Combined Radium (-226 And -228)
1.22025 pCi/L 24%
of the EPA limit 5 pCi/L
Main supplier: Viejas Community System · 9,600 people · 2018
1/2 SYR4
PFBS
0.0243 µg/L
No EPA limit set
Main supplier: Viejas Community System · 9,600 people · 2024
1/2 UCMR-5
Lead
0.00080 mg/L 5.3%
of the EPA limit 0.0150 mg/L
Main supplier: Viejas Community System · 9,600 people · 2025
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 Alpine

SupplierPopulation served
Viejas Community System 9,600
WILLOWSIDE TERRACE WATER ASSOCIATION 100

Frequently asked questions about Alpine tap water

Is Alpine tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Alpine. 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 Alpine?

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

What contaminants are in Alpine's water?

The contaminants EPA monitoring detected in Alpine include Nitrate, Fluoride, Barium, TTHM, Lithium. 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.