Drinking water quality · 2023
· Verified
· PWSID CA0110008
What's in City of Pleasanton — Pleasanton, Ca, CA tap water
3 contaminants in City of Pleasanton — Pleasanton, Ca, CA's water sat at or above a federal limit, led by PFOS at 6.8x the limit.
- !3 contaminants at or above a federal limit — worst is PFOS at 6.8x
- !2 contaminants within 20% of a limit
- !15 of 27 core regulated contaminants reported — 12 never appear in this report
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −60 contaminants at or above a federal limit
- −8 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −6 core regulated contaminants never reported (15/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- PFOS6.8× the federal limit27.2 ng/L · limit 4 ng/L
Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 90% of CA systems that report it · higher than 90% of U.S. systems
- Perfluorohexanesulfonic acid2.3× the federal limit23.2 ng/L · limit 10 ng/L
Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
Higher than 85% of CA systems that report it · higher than 90% of U.S. systems
- PFOA1.1× the federal limit4.45 ng/L · limit 4 ng/L
Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 55% of CA systems that report it · higher than 65% of U.S. systems
- TTHM98% of the federal limit78 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
Higher than 95% of CA systems that report it · higher than 90% of U.S. systems
- HAA592% of the federal limit55 ug/L · limit 60 ug/L
Long-term exposure above the federal limit is associated with an increased cancer risk.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
+29 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Chloramine | 2.41 mg/L | 4 mg/L |
| Nitrate | 3 mg/L | 10 mg/L |
| Copper | 0.33 mg/L | 1.3 mg/L |
| Fluoride | 0.68 mg/L | 4 mg/L |
| Barium | 152 ug/L | 2000 ug/L |
| Turbidity | 0.06 NTU | 1 NTU |
| Chloride | 84 mg/L | — |
| Sulfate | 57 mg/L | — |
| Boron | 606 ug/L | — |
| Chromium, Hexavalent | 4.6 ug/L | — |
| Lead | 0 ug/L | 15 ug/L |
| Manganese | Not detected ug/L | — |
| Potassium | 2.1 mg/L | — |
| Selenium | Not detected ug/L | 50 ug/L |
| Silica | 21 mg/L | — |
| Sodium | 61 mg/L | — |
| Total Coliform | 0 % | 0 % |
| Hexafluoropropylene oxide dimer acid | Not detected ng/L | 10 ng/L |
| Perfluorobutanesulfonic acid | 5.9 ng/L | 500 ng/L |
| Perfluorohexanoic acid | 4.2 ng/L | — |
| Perfluorononanoic acid | Not detected ng/L | 10 ng/L |
| Alkalinity | 266 mg/L | — |
| Hardness | 309 mg/L | — |
| pH | 8.7 | — |
| Specific Conductance | 826 | — |
| TOC | 1.1 | — |
| Total Dissolved Solids | 506 mg/L | — |
| Gross Alpha | Not detected pCi/L | 15 pCi/L |
| Uranium | Not detected pCi/L | 20 pCi/L |
What this report doesn't tell you
12 of the 27 contaminants a community water system normally reports do not appear anywhere in City of Pleasanton — Pleasanton, Ca, CA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Maximum contaminant level exceededHealth-based2 violations on record · most recent Nov 1995resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗