Tap Water Quality Report
Tap water quality in MADERA, California
Tap water in MADERA, California receives a grade of C (79/100) from TapWaterSafety.org. It's served by CITY OF MADERA. The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Arsenic significantly above health guideline; Chromium (hexavalent) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in MADERA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving MADERA.
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.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.14 ppb, 285x above the EWG health guideline of 0.004 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 1.54 ppb, 77x above the EWG health guideline of 0.02 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF MADERA (system ID CA2010002) 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 MADERA
Filters matched to the specific contaminants in MADERA's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
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 MADERA'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 (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Arsenic Heavy metal |
1.14 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 285× over |
| Chromium (hexavalent) Heavy metal |
1.54 ppb | 0.02 | — | — | — | — | — | 77× over |
| Nitrate Inorganic |
1.79 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 13× over |
| 1,2-Dibromo-3-chloropropane (DBCP) Other |
0.0163 ppb | 0.0017 | 0.2 | — | — | — | — | 9.6× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.597 ppb | 0.15 | 80.0 | 100 | — | — | — | 4.0× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.233 ppb | 0.06 | 5.0 | — | — | — | — | 3.9× over |
| Radium, combined (-226 and -228) Radiological |
0.12 pCi/L | 0.05 | 5.0 | — | — | — | — | 2.4× over |
| Bromoform Disinfection byproduct |
0.597 ppb | 0.5 | — | — | — | — | — | 1.2× over |
| Vanadium Other |
21.5 ppb | 21.0 | — | — | — | — | — | 1.0× over |
| Molybdenum Other |
2.8 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
8.84 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0138 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Barium Heavy metal |
18.4 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Manganese Heavy metal |
2.34 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Strontium Radiological |
0.208 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.0843 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 CITY OF MADERA.