Tap Water Quality Report
Tap water quality in ROSEMEAD, California
Tap water in ROSEMEAD, California receives a grade of D (62/100) from TapWaterSafety.org. It's served by CAL AMERICAN WATER CO. The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Arsenic* significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in ROSEMEAD's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving ROSEMEAD.
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 1.1 ppb, 275x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 11.1 ppb, 186x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for CAL AMERICAN WATER CO (system ID CA5610040) 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 ROSEMEAD
Filters matched to the specific contaminants in ROSEMEAD'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 ROSEMEAD'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 |
1.1 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 275× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
11.1 ppb | 0.06 | — | — | — | — | — | 186× over |
| Radon* Radiological |
258.72 pCi/L | 1.5 | — | — | — | — | — | 172× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
22.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 149× over |
| Dibromoacetic acid Disinfection byproduct |
3.01 ppb | 0.03 | — | — | — | — | — | 100× over |
| Dibromochloromethane Disinfection byproduct |
8.25 ppb | 0.1 | — | — | — | — | — | 82× over |
| Bromodichloromethane Disinfection byproduct |
4.13 ppb | 0.06 | — | — | — | — | — | 69× over |
| Chromium (hexavalent) Heavy metal |
0.363 ppb | 0.02 | — | — | — | — | — | 18× over |
| Bromoform Disinfection byproduct |
8.2 ppb | 0.5 | — | — | — | — | — | 16× over |
| Dichloroacetic acid Disinfection byproduct |
2.02 ppb | 0.2 | — | — | — | — | — | 10× over |
| Chloroform Disinfection byproduct |
1.72 ppb | 0.4 | — | — | — | — | — | 4.3× over |
| Trichloroacetic acid Disinfection byproduct |
0.389 ppb | 0.1 | — | — | — | — | — | 3.9× over |
| Uranium* Radiological |
1.09 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 2.5× over |
| Nitrate* Inorganic |
0.173 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.2× over |
| Nitrate and nitrite* Inorganic |
0.16 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.1× over |
| Bromochloromethane Other |
0.02 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Vanadium Other |
4.09 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
29.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Selenium* Heavy metal |
2.65 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Dichloromethane (methylene chloride)* Volatile organic compound |
0.323 ppb | 4.0 | 5.0 | — | — | — | — | Below guideline |
| Molybdenum Other |
2.94 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid* Disinfection byproduct |
1.07 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.81 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.149 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.293 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Xylenes (total)* Volatile organic compound |
0.0318 ppb | 1800.0 | 10000.0 | — | — | — | — | Below guideline |
| Dibromomethane* Other |
1.33 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride* Inorganic |
0.631 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
16.2 ppb | — | — | — | — | — | — | Below guideline |
| Nitrite* Inorganic |
0.0128 ppm | — | 1.0 | — | — | — | — | 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 CAL AMERICAN WATER CO.