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Tap water quality report

Pleasanton, CA

EPA monitoring detected 26 contaminants across the 3 water suppliers serving Pleasanton. 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
175,989
people served
26
contaminants found
California rankings Lead in California PFAS in California

What was found in Pleasanton'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
5650 µg/L 56%
of the EPA limit 10000 µg/L
 1/3 SYR4
Barium
330 µg/L 17%
of the EPA limit 2000 µg/L
 1/3 SYR4
Fluoride
210 µg/L 5.3%
of the EPA limit 4000 µg/L
 1/3 SYR4
TTHM
58.45 µg/L 73%
of the EPA limit 80 µg/L
 3/3 SYR4
Glyphosate
50 µg/L 7.1%
of the EPA limit 700 µg/L
 1/3 SYR4
Total Haloacetic Acids (HAA5)
26.6 µg/L 44%
of the EPA limit 60 µg/L
 2/3 SYR4
Dibromochloromethane
23.7 µg/L
No EPA limit set
 2/3 SYR4
Bromoform
23.26 µg/L
No EPA limit set
 3/3 SYR4
Chloroform
20.73 µg/L
No EPA limit set
 2/3 SYR4
Lithium
16.8 µg/L
No EPA limit set
 1/3 UCMR-5
Dibromoacetic Acid
13.7 µg/L
No EPA limit set
 2/3 SYR4
Dichloroacetic Acid
12.4 µg/L
No EPA limit set
 2/3 SYR4
Trichloroacetic Acid
12.3 µg/L
No EPA limit set
 2/3 SYR4
Bromodichloromethane
8.98 µg/L
No EPA limit set
 2/3 SYR4
Combined Uranium
2.831 µg/L 9.4%
of the EPA limit 30 µg/L
 1/3 SYR4
Monobromoacetic Acid
2 µg/L
No EPA limit set
 1/3 SYR4
Gross Beta Particle Activity
0.5290 pCi/L
No EPA limit set
 1/3 SYR4
Lead
0.0410 mg/L 273%
above the EPA limit of 0.0150 mg/L
 3/3 LCR
PFOS
0.0260 µg/L
No EPA limit set
 1/3 UCMR-5
PFHXS
0.0220 µg/L
No EPA limit set
 1/3 UCMR-5
Pfba
0.0063 µg/L
No EPA limit set
 1/3 UCMR-5
PFBS
0.0061 µg/L
No EPA limit set
 1/3 UCMR-5
PFOA
0.0051 µg/L
No EPA limit set
 1/3 UCMR-5
Pfpes
0.0043 µg/L
No EPA limit set
 1/3 UCMR-5
Pfhxa
0.0041 µg/L
No EPA limit set
 1/3 UCMR-5
Pfpea
0.0041 µg/L
No EPA limit set
 1/3 UCMR-5
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 Pleasanton

SupplierPopulation served
DUBLIN SAN RAMON SERVICES DISTRICT 98,776
CITY OF PLEASANTON 76,689
CASTLEWOOD DOMESTIC WATER SYSTEM 524

Frequently asked questions about Pleasanton tap water

Is Pleasanton tap water safe to drink?

EPA testing detected 26 contaminants in the water serving Pleasanton. 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 Pleasanton?

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

What contaminants are in Pleasanton's water?

The contaminants EPA monitoring detected in Pleasanton include Nitrate, Barium, Fluoride, TTHM, Glyphosate. 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.