Tap Water Quality Report
Tap water quality in AZUSA, California
Tap water in AZUSA, California receives a grade of F (47/100) from TapWaterSafety.org. It's served by AZUSA LIGHT AND WATER. The most significant water quality concerns are: PFAS contamination; Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in AZUSA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving AZUSA.
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.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.47 ppb, 369x above the EWG health guideline of 0.004 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.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 21.7 ppb, 362x above the EWG health guideline of 0.06 ppb.
Recommended filters for AZUSA
Filters matched to the specific contaminants in AZUSA'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 AZUSA'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 |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
1.47 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 369× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
21.7 ppb | 0.06 | — | — | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
34.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 232× over |
| Bromodichloromethane Disinfection byproduct |
7.95 ppb | 0.06 | — | — | — | — | — | 132× over |
| Dibromoacetic acid Disinfection byproduct |
3.04 ppb | 0.03 | — | — | — | — | — | 101× over |
| Dibromochloromethane Disinfection byproduct |
9.36 ppb | 0.1 | — | — | — | — | — | 94× over |
| Trichloroacetic acid Disinfection byproduct |
3.66 ppb | 0.1 | — | — | — | — | — | 37× over |
| Chloroform Disinfection byproduct |
12.7 ppb | 0.4 | — | — | — | — | — | 32× over |
| Dichloroacetic acid Disinfection byproduct |
4.26 ppb | 0.2 | — | — | — | — | — | 21× over |
| Nitrate Inorganic |
2.3 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 16× over |
| Chromium (hexavalent) Heavy metal |
0.303 ppb | 0.02 | — | — | — | — | — | 15× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.23 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 14× over |
| Bromoform Disinfection byproduct |
4.69 ppb | 0.5 | — | — | — | — | — | 9.4× over |
| Nitrate and nitrite Inorganic |
0.9 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 6.4× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
1.01 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 3.4× over |
| Uranium Radiological |
1.06 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 2.5× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.0776 ppb | 0.06 | 5.0 | — | — | — | — | 1.3× over |
| Perchlorate Disinfection byproduct |
0.877 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
76.7 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
86.3 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Vanadium Other |
1.21 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
1.79 ppb | 40.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0099 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.167 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.406 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
1.59 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.41 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.29 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.421 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.376 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.165 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.255 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 AZUSA LIGHT AND WATER.