Tap Water Quality Report
Tap water quality in HESPERIA, California
Tap water in HESPERIA, California receives a grade of F (57/100) from TapWaterSafety.org. It's served by HESPERIA WD. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Chromium (hexavalent) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in HESPERIA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving HESPERIA.
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 0.772 ppt, 772x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 20.7 ppb, 207x above the EWG health guideline of 0.1 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 3.75 ppb, 188x above the EWG health guideline of 0.02 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.112 ppb.
Recommended filters for HESPERIA
Filters matched to the specific contaminants in HESPERIA'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.
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.
All contaminants detected in HESPERIA'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 |
0.772 ppt | 0.001 | 10.0 | — | — | — | — | 772× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
20.7 ppb | 0.1 | 60.0 | 60 | — | — | — | 207× over |
| Chromium (hexavalent) Heavy metal |
3.75 ppb | 0.02 | — | — | — | — | — | 188× over |
| Arsenic Heavy metal |
0.112 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 28× over |
| Nitrate and nitrite Inorganic |
1.6 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 11× over |
| Nitrate Inorganic |
1.05 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 7.5× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.607 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 6.7× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.514 ppb | 0.15 | 80.0 | 100 | — | — | — | 3.4× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.869 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 2.9× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.124 ppb | 0.06 | — | — | — | — | — | 2.1× over |
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) Other |
1.73 ppt | 1.0 | — | — | — | — | — | 1.7× over |
| Bromoform Disinfection byproduct |
0.55 ppb | 0.5 | — | — | — | — | — | 1.1× over |
| Vanadium Other |
17.8 ppb | 21.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.00377 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Molybdenum Other |
0.246 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
0.75 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.129 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.314 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.23 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.145 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.107 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.0824 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.201 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.0191 ppb | — | — | — | — | — | — | Below guideline |
| o-toluidine Other |
0.000875 ppb | — | — | — | — | — | — | Below guideline |
| Testosterone Other |
0.006 ppt | — | — | — | — | — | — | 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 HESPERIA WD.