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.
EPA compliance record
Official U.S. EPA records for AZUSA LIGHT AND WATER (system ID CA1910007) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for AZUSA
Filters matched to the specific contaminants in AZUSA's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
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.