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Tap water quality report

Fremont, CA

EPA monitoring detected 25 contaminants across the 1 water supplier serving Fremont. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
344,000
people served
25
contaminants found
California rankings Lead in California PFAS in California

What was found in Fremont's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
1000000 µg/L 10000%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Nitrate
3353.84 µg/L 34%
of the EPA limit 10000 µg/L
 1/1 SYR4
Fluoride
1060 µg/L 27%
of the EPA limit 4000 µg/L
 1/1 SYR4
Barium
260 µg/L 13%
of the EPA limit 2000 µg/L
 1/1 SYR4
TTHM
97 µg/L 121%
of the EPA limit, in the worst sample — 80 µg/L
 1/1 SYR4
Copper
81 µg/L 6.2%
of the EPA limit 1300 µg/L
 1/1 SYR4
Chloroform
49.13 µg/L
No EPA limit set
 1/1 SYR4
Bromoform
37.28 µg/L
No EPA limit set
 1/1 SYR4
Total Haloacetic Acids (HAA5)
35 µg/L 58%
of the EPA limit 60 µg/L
 1/1 SYR4
Dibromochloromethane
31.62 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
31 µg/L
No EPA limit set
 1/1 SYR4
Dichloroacetic Acid
20 µg/L
No EPA limit set
 1/1 SYR4
Trichloroacetic Acid
15 µg/L
No EPA limit set
 1/1 SYR4
Selenium
13 µg/L 26%
of the EPA limit 50 µg/L
 1/1 SYR4
Dibromoacetic Acid
12 µg/L
No EPA limit set
 1/1 SYR4
Chromium
10 µg/L 10%
of the EPA limit 100 µg/L
 1/1 SYR4
Arsenic
5.6 µg/L 56%
of the EPA limit 10 µg/L
 1/1 SYR4
Combined Uranium
3.3 µg/L 11%
of the EPA limit 30 µg/L
 1/1 SYR4
Di(2-ethylhexyl) Phthalate
3.3 µg/L 55%
of the EPA limit 6 µg/L
 1/1 SYR4
Monochloroacetic Acid
2 µg/L
No EPA limit set
 1/1 SYR4
Bromate
1.1 µg/L 11%
of the EPA limit 10 µg/L
 1/1 SYR4
Monobromoacetic Acid
1.1 µg/L
No EPA limit set
 1/1 SYR4
Asbestos
1 MFL 14%
of the EPA limit 7 MFL
 1/1 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.0320 µg/L 16%
of the EPA limit 0.2000 µg/L
 1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 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 single worst sample on record — 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 Fremont

SupplierPopulation served
ALAMEDA COUNTY WATER DISTRICT 344,000

Frequently asked questions about Fremont tap water

Is Fremont tap water safe to drink?

EPA testing detected 25 contaminants in the water serving Fremont. 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 Fremont?

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

What contaminants are in Fremont's water?

The contaminants EPA monitoring detected in Fremont include Nitrate-Nitrite, Nitrate, Fluoride, Barium, TTHM. The full list, with the highest level found 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.