Tap Water Quality Report
Tap water quality in HIGHLAND, California
Tap water in HIGHLAND, California receives a grade of D (62/100) from TapWaterSafety.org. It's served by EAST VALLEY WATER DISTRICT. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in HIGHLAND's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving HIGHLAND.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 23.5 ppb, 392x above the EWG health guideline of 0.06 ppb.
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 24.0 ppb, 160x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.537 ppb.
Recommended filters for HIGHLAND
Filters matched to the specific contaminants in HIGHLAND's water supply.
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 HIGHLAND'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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
23.5 ppb | 0.06 | — | — | — | — | — | 392× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
24.0 ppb | 0.15 | 80.0 | 100 | — | — | — | 160× over |
| Arsenic Heavy metal |
0.537 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 134× over |
| Dibromoacetic acid Disinfection byproduct |
3.96 ppb | 0.03 | — | — | — | — | — | 132× over |
| Bromodichloromethane Disinfection byproduct |
6.49 ppb | 0.06 | — | — | — | — | — | 108× over |
| Dibromochloromethane Disinfection byproduct |
9.85 ppb | 0.1 | — | — | — | — | — | 99× over |
| Nitrate Inorganic |
5.34 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 38× over |
| Chromium (hexavalent) Heavy metal |
0.544 ppb | 0.02 | — | — | — | — | — | 27× over |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.024 ppt | 0.001 | 10.0 | — | — | — | — | 24× over |
| Nitrate and nitrite Inorganic |
2.18 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 16× over |
| Trichloroacetic acid Disinfection byproduct |
1.53 ppb | 0.1 | — | — | — | — | — | 15× over |
| Uranium Radiological |
5.34 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 12× over |
| Dichloroacetic acid Disinfection byproduct |
1.93 ppb | 0.2 | — | — | — | — | — | 9.6× over |
| Bromoform Disinfection byproduct |
4.27 ppb | 0.5 | — | — | — | — | — | 8.5× over |
| Chloroform Disinfection byproduct |
3.41 ppb | 0.4 | — | — | — | — | — | 8.5× over |
| Chlorate Disinfection byproduct |
47.4 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
3.82 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
4.16 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.425 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.31 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Aluminum Heavy metal |
0.38 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Strontium Radiological |
0.304 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.28 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.893 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.209 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, 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 EAST VALLEY WATER DISTRICT.