Tap Water Quality Report
Tap water quality in PLEASANTON, California
Tap water in PLEASANTON, California receives a grade of F (48/100) from TapWaterSafety.org. It's served by 2 public water systems, primarily DUBLIN SAN RAMON SERVICES DISTRICT. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS)* significantly above health guideline; Arsenic* significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Perfluorohexane sulfonate (PFHXS) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in PLEASANTON's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utilities serving PLEASANTON.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS)*, Perfluorooctanoic acid (PFOA)* detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS)* significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS)* detected at 20.8 ppt, 20750x above the EWG health guideline of 0.001 ppt.
Arsenic* significantly above health guideline
Moderate concernArsenic* detected at 1.42 ppb, 355x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 35.5 ppb, 355x above the EWG health guideline of 0.1 ppb.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 23.6 ppt, 23575x above the EWG health guideline of 0.001 ppt.
Water systems serving PLEASANTON
PLEASANTON is served by 2 public water systems. Click any utility to see its complete grade card and treatment plant contact info.
DUBLIN SAN RAMON SERVICES DISTRICT
- PFAS contamination
- Perfluorohexane sulfonate (PFHXS)* significantly above health guideline
- Arsenic* significantly above health guideline
CITY OF PLEASANTON
- PFAS contamination
- Perfluorohexane sulfonate (PFHXS) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
Recommended filters for PLEASANTON
Filters matched to the specific contaminants in PLEASANTON's water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in PLEASANTON's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
23.6 ppt | 0.001 | 10.0 | — | — | — | — | EPA violation |
| Perfluorohexane sulfonate (PFHXS)* PFAS |
20.8 ppt | 0.001 | 10.0 | — | — | — | — | EPA violation |
| Perfluorooctane sulfonate (PFOS) PFAS |
28.1 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Perfluorooctane sulfonate (PFOS)* PFAS |
25.2 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.1 ppb | 0.1 | 60.0 | 60 | — | — | — | 361× over |
| Arsenic* Heavy metal |
1.42 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 355× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
12.5 ppb | 0.06 | — | — | — | — | — | 209× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
25.9 ppb | 0.15 | 80.0 | 100 | — | — | — | 172× over |
| Chromium (hexavalent) Heavy metal |
3.34 ppb | 0.02 | — | — | — | — | — | 167× over |
| Dibromoacetic acid Disinfection byproduct |
3.96 ppb | 0.03 | — | — | — | — | — | 132× over |
| Bromodichloromethane Disinfection byproduct |
5.78 ppb | 0.06 | — | — | — | — | — | 96× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.545 ppt | 0.006 | 10.0 | — | — | — | — | 91× over |
| Perfluoroheptane sulfonic acid (PFHpS)* PFAS |
0.09 ppt | 0.001 | — | — | — | — | — | 90× over |
| Dibromochloromethane Disinfection byproduct |
7.44 ppb | 0.1 | — | — | — | — | — | 74× over |
| Perfluorooctanoic acid (PFOA) PFAS |
3.87 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 43× over |
| Dichloroacetic acid Disinfection byproduct |
6.58 ppb | 0.2 | — | — | — | — | — | 33× over |
| Perfluorooctanoic acid (PFOA)* PFAS |
2.95 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 33× over |
| Chloroform Disinfection byproduct |
5.82 ppb | 0.4 | — | — | — | — | — | 15× over |
| Nitrate Inorganic |
1.95 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 14× over |
| Trichloroacetic acid Disinfection byproduct |
1.26 ppb | 0.1 | — | — | — | — | — | 13× over |
| Bromoform Disinfection byproduct |
5.46 ppb | 0.5 | — | — | — | — | — | 11× over |
| Nitrate* Inorganic |
1.21 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 8.6× over |
| Uranium Radiological |
1.9 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 4.4× over |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
3.28 ppt | 1.0 | — | — | — | — | — | 3.3× over |
| Bromate* Disinfection byproduct |
0.241 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 2.4× over |
| Perfluoropentane sulfonic acid (PFPeS)* PFAS |
2.12 ppt | 1.0 | — | — | — | — | — | 2.1× over |
| Uranium* Radiological |
0.65 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 1.5× over |
| Chlorate Disinfection byproduct |
283.6 ppb | 210.0 | — | — | — | — | — | 1.4× over |
| N-Nitrosodimethylamine (NDMA)* Other |
3.1 ppt | 3.0 | — | — | — | — | — | 1.0× over |
| Barium Heavy metal |
225.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Aluminum* Heavy metal |
70.9 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Barium* Heavy metal |
62.5 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Thallium* Heavy metal |
0.00804 ppb | 0.1 | 2.0 | — | — | — | — | Below guideline |
| Vanadium Other |
1.35 ppb | 21.0 | — | — | — | — | — | Below guideline |
| 4,8-dioxa-3H-perfluorononanoic acid (ADONA) PFAS |
0.03 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Selenium* Heavy metal |
0.741 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Molybdenum Other |
0.588 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.646 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Beryllium* Heavy metal |
0.00893 ppb | 1.0 | 4.0 | — | — | 1 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.15 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
5.33 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
4.05 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA)* PFAS |
3.67 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
2.87 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
5.35 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
2.42 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS)* PFAS |
4.51 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.18 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA)* PFAS |
1.31 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA)* PFAS |
1.06 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA)* PFAS |
0.638 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.814 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Bromide* Other |
227.4 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total)* Heavy metal |
0.254 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.747 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from DUBLIN SAN RAMON SERVICES DISTRICT.