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Tap water quality report

Mountain View, CA

EPA monitoring detected 20 contaminants across the 1 water supplier serving Mountain View. 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.

1
water supplier
81,501
people served
20
contaminants found
California rankings Lead in California PFAS in California

What was found in Mountain View'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
6565.5 µg/L 66%
of the EPA limit 10000 µg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Nitrate-Nitrite
6280 µg/L 63%
of the EPA limit 10000 µg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2018
1/1 SYR4
Fluoride
160 µg/L 4%
of the EPA limit 4000 µg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Barium
150 µg/L 7.5%
of the EPA limit 2000 µg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2018
1/1 SYR4
TTHM
77.6545 µg/L 97%
of the EPA limit 80 µg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Chloroform
62.940999999999995 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
55.145 µg/L 92%
of the EPA limit 60 µg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Dibromochloromethane
32.476 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Dichloroacetic Acid
28.85 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Trichloroacetic Acid
26.089999999999996 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Bromodichloromethane
24.788 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Bromoform
20.354000000000003 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Dibromoacetic Acid
14.720000000000002 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Lithium
9.3 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2023
1/1 UCMR-5
Monobromoacetic Acid
4.109999999999999 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Monochloroacetic Acid
3.605 µg/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Diquat
2.4 µg/L 12%
of the EPA limit 20 µg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2019
1/1 SYR4
Gross Beta Particle Activity
2.3 pCi/L
No EPA limit set
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2013
1/1 SYR4
Combined Radium (-226 And -228)
1.01 pCi/L 20%
of the EPA limit 5 pCi/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2013
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF MOUNTAIN VIEW · 81,501 people · 2025
1/1 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 Mountain View

SupplierPopulation served
CITY OF MOUNTAIN VIEW 81,501

Frequently asked questions about Mountain View tap water

Is Mountain View tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Mountain View. 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 Mountain View?

1 public water supplier report drinking-water monitoring for Mountain View, California to the EPA. Each is listed above with its population served.

What contaminants are in Mountain View's water?

The contaminants EPA monitoring detected in Mountain View include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. 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.