What was found in Pleasanton'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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 4972 µg/L 50% of the EPA limit 10000 µg/L Highest in the city: CITY OF PLEASANTON · 76,689 people · 2019 | 1/3 | SYR4 |
| Barium | 326 µg/L 16% of the EPA limit 2000 µg/L Highest in the city: CITY OF PLEASANTON · 76,689 people · 2018 | 1/3 | SYR4 |
| Fluoride | 160 µg/L 4% of the EPA limit 4000 µg/L Highest in the city: CITY OF PLEASANTON · 76,689 people · 2018 | 1/3 | SYR4 |
| Glyphosate | 50 µg/L 7.1% of the EPA limit 700 µg/L Highest in the city: CITY OF PLEASANTON · 76,689 people · 2018 | 1/3 | SYR4 |
| TTHM | 23.73 µg/L 30% of the EPA limit 80 µg/L Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 45.34 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 10.54 µg/L 18% of the EPA limit 60 µg/L Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 22.4 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 2/3 | SYR4 |
| Bromoform | 2.008 µg/L No EPA limit set Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 22.318 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 3/3 | SYR4 |
| Chloroform | 12.725 µg/L No EPA limit set Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 19.7325 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 3.4 µg/L No EPA limit set Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 17.832 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 2/3 | SYR4 |
| Lithium | 16.8 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| Dichloroacetic Acid | 4.86 µg/L No EPA limit set Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 11.925 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 2.3 µg/L No EPA limit set Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 11.4 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 5.9 µg/L No EPA limit set Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019
Highest in the city: 10.255 µg/L — CITY OF PLEASANTON · 76,689 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 7.615 µg/L No EPA limit set Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 2.831 µg/L 9.4% of the EPA limit 30 µg/L Highest in the city: CITY OF PLEASANTON · 76,689 people · 2018 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.99 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2019 | 1/3 | SYR4 |
| Gross Beta Particle Activity | 0.5290 pCi/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2018 | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: DUBLIN SAN RAMON SERVICES DISTRICT · 98,776 people · 2025
Highest in the city: 0.0410 mg/L — CASTLEWOOD DOMESTIC WATER SYSTEM · 524 people · 2023 | 3/3 | LCR |
| PFOS | 0.0260 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| PFHXS | 0.0220 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| Pfba | 0.0063 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| PFBS | 0.0061 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| PFOA | 0.0051 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| Pfpes | 0.0043 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| Pfhxa | 0.0041 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 1/3 | UCMR-5 |
| Pfpea | 0.0041 µg/L No EPA limit set Highest in the city: CITY OF PLEASANTON · 76,689 people · 2025 | 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 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 Pleasanton
| Supplier | Population 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, Glyphosate, 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.