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Tap water quality report

Davis, CA

EPA monitoring detected 15 contaminants across the 3 water suppliers serving Davis. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
117,113
people served
15
contaminants found
California rankings Lead in California PFAS in California

What was found in Davis'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
10396 µg/L 104%
of the EPA limit, in the worst sample — 10000 µg/L
 3/3 SYR4
Nitrate-Nitrite
6100 µg/L 61%
of the EPA limit 10000 µg/L
 2/3 SYR4
Fluoride
410 µg/L 10%
of the EPA limit 4000 µg/L
 3/3 SYR4
Copper
400 µg/L 31%
of the EPA limit 1300 µg/L
 2/3 SYR4
Barium
230 µg/L 12%
of the EPA limit 2000 µg/L
 3/3 SYR4
Chromium
53 µg/L 53%
of the EPA limit 100 µg/L
 3/3 SYR4
Selenium
45 µg/L 90%
of the EPA limit 50 µg/L
 2/3 SYR4
Lithium
37.3 µg/L
No EPA limit set
 2/3 UCMR-5
Gross Beta Particle Activity
15.58 pCi/L
No EPA limit set
 1/3 SYR4
Lead
11 µg/L 73%
of the EPA limit 15 µg/L
 2/3 SYR4
Combined Uranium
9.5658 µg/L 32%
of the EPA limit 30 µg/L
 2/3 SYR4
Arsenic
8.4 µg/L 84%
of the EPA limit 10 µg/L
 3/3 SYR4
Picloram
1.1 µg/L 0.2%
of the EPA limit 500 µg/L
 1/3 SYR4
TTHM
0.6300 µg/L 0.8%
of the EPA limit 80 µg/L
 1/3 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 3/3 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 Davis

SupplierPopulation served
CITY OF DAVIS 67,457
UC - DAVIS 49,616
ROLLING ACRES MUTUAL WATER COMPANY 40

Frequently asked questions about Davis tap water

Is Davis tap water safe to drink?

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

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

What contaminants are in Davis's water?

The contaminants EPA monitoring detected in Davis include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. 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.