Water Quality Report · Updated May 12, 2026
CITY OF SAN JOSE - EVG/EDV/COY
CITY OF SAN JOSE - EVG/EDV/COY delivers tap water graded F (53/100) by TapWaterSafety.org. The utility serves approximately 101,265 residents in SAN JOSE, California using surface water (purchased). The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Arsenic detected. For questions, the utility can be reached at 408-277-3288.
Is SAN JOSE tap water safe to drink?
CITY OF SAN JOSE - EVG/EDV/COY delivers tap water that earns a grade of F (53/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 101,265 residents in SAN JOSE, drawing from surface water (purchased).
Public testing data identifies 17 contaminants in this water above EWG's health-based guidelines, including: Perfluorohexane sulfonate (PFHXS), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Chromium (hexavalent), Dibromoacetic acid, Dibromochloromethane, Haloacetic acids (HAA9), Bromodichloromethane, Arsenic, Bromoform, Bromate*, Perfluorooctanoic acid (PFOA)*, Nitrate, Nitrate and nitrite, Chloroform, Dichloroacetic acid, Trichloroacetic acid. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for SAN JOSE residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for CITY OF SAN JOSE - EVG/EDV/COY.
PFAS contamination
Severe concernPerfluorooctanoic acid (PFOA)*, Perfluorooctane sulfonate (PFOS) 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 2.3 ppt, 2304x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 40.4 ppb, 269x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.2 ppb.
Contact CITY OF SAN JOSE - EVG/EDV/COY
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for SAN JOSE
Filters matched to the specific contaminants in this 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.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 53/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 |
2.3 ppt | 0.001 | 10.0 | — | — | — | — | 2304× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
40.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 269× over |
| Chromium (hexavalent) Heavy metal |
3.85 ppb | 0.02 | — | — | — | — | — | 192× over |
| Dibromoacetic acid Disinfection byproduct |
4.67 ppb | 0.03 | — | — | — | — | — | 156× over |
| Dibromochloromethane Disinfection byproduct |
13.9 ppb | 0.1 | — | — | — | — | — | 139× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
8.33 ppb | 0.06 | — | — | — | — | — | 139× over |
| Bromodichloromethane Disinfection byproduct |
8.26 ppb | 0.06 | — | — | — | — | — | 138× over |
| Arsenic Heavy metal |
0.2 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 50× over |
| Bromoform Disinfection byproduct |
13.4 ppb | 0.5 | — | — | — | — | — | 27× over |
| Bromate* Disinfection byproduct |
1.68 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 17× over |
| Perfluorooctanoic acid (PFOA)* PFAS |
1.38 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 15× over |
| Nitrate Inorganic |
1.8 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 13× over |
| Nitrate and nitrite Inorganic |
1.83 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 13× over |
| Chloroform Disinfection byproduct |
4.77 ppb | 0.4 | — | — | — | — | — | 12× over |
| Dichloroacetic acid Disinfection byproduct |
1.88 ppb | 0.2 | — | — | — | — | — | 9.4× over |
| Trichloroacetic acid Disinfection byproduct |
0.624 ppb | 0.1 | — | — | — | — | — | 6.2× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.222 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | Below guideline |
| Chlorate Disinfection byproduct |
91.4 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.0256 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Uranium* Radiological |
0.09 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Vanadium Other |
4.03 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
130.9 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Aluminum Heavy metal |
28.0 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Molybdenum Other |
0.669 ppb | 40.0 | — | — | — | — | — | Below guideline |
| N-Nitrosodimethylamine (NDMA)* Other |
0.047 ppt | 3.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid* Disinfection byproduct |
0.0953 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA)* PFAS |
1.54 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.121 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0221 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.775 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.283 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.316 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA)* PFAS |
0.198 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.189 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Bromide* Other |
72.3 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.154 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
5.7 ppb | — | — | — | — | — | — | 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
CITY OF SAN JOSE - EVG/EDV/COY service area
This water system serves 1 community in Santa Clara County, California. Click any city for its dedicated tap water quality page.
Find the right filter for SAN JOSE water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.