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Tap water quality report

San Bruno, CA

EPA monitoring detected 17 contaminants across the 1 water supplier serving San Bruno. 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
42,631
people served
17
contaminants found
California rankings Lead in California PFAS in California

What was found in San Bruno'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
1700 µg/L 17%
of the EPA limit 10000 µg/L
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Nitrate-Nitrite
1500 µg/L 15%
of the EPA limit 10000 µg/L
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2017
1/1 SYR4
Fluoride
157 µg/L 3.9%
of the EPA limit 4000 µg/L
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
TTHM
45.99499999999999 µg/L 57%
of the EPA limit 80 µg/L
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Chloroform
44.7 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Lithium
40 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2025
1/1 UCMR-5
Total Haloacetic Acids (HAA5)
32.58 µg/L 54%
of the EPA limit 60 µg/L
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Chromium
20 µg/L 20%
of the EPA limit 100 µg/L
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Dichloroacetic Acid
18.45 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Trichloroacetic Acid
13.924999999999999 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Bromodichloromethane
7.255 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Dibromochloromethane
4.1475 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Monochloroacetic Acid
3.2 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Bromoform
2.649999999999999 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.9299999999999993 µg/L
No EPA limit set
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Toluene
0.7800 µg/L 0.1%
of the EPA limit 1000 µg/L
Main supplier: CITY OF SAN BRUNO · 42,631 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF SAN BRUNO · 42,631 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 San Bruno

SupplierPopulation served
CITY OF SAN BRUNO 42,631

Frequently asked questions about San Bruno tap water

Is San Bruno tap water safe to drink?

EPA testing detected 17 contaminants in the water serving San Bruno. 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 San Bruno?

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

What contaminants are in San Bruno's water?

The contaminants EPA monitoring detected in San Bruno include Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Chloroform. 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.