Tap Water Quality Report
Tap water quality in ROSEVILLE, California
Tap water in ROSEVILLE, California receives a grade of C (72/100) from TapWaterSafety.org. It's served by CITY OF ROSEVILLE. The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) 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 ROSEVILLE's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving ROSEVILLE.
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 18.3 ppb, 304x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 43.3 ppb, 289x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.23 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF ROSEVILLE (system ID CA3110008) 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 ROSEVILLE
Filters matched to the specific contaminants in ROSEVILLE'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 ROSEVILLE'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 |
| Haloacetic acids (HAA9) Disinfection byproduct |
18.3 ppb | 0.06 | — | — | — | — | — | 304× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
43.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 289× over |
| Trichloroacetic acid Disinfection byproduct |
14.8 ppb | 0.1 | — | — | — | — | — | 148× over |
| Chloroform Disinfection byproduct |
40.6 ppb | 0.4 | — | — | — | — | — | 101× over |
| Arsenic Heavy metal |
0.23 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 58× over |
| Dichloroacetic acid Disinfection byproduct |
10.5 ppb | 0.2 | — | — | — | — | — | 52× over |
| Chromium (hexavalent) Heavy metal |
0.991 ppb | 0.02 | — | — | — | — | — | 50× over |
| Bromodichloromethane Disinfection byproduct |
2.61 ppb | 0.06 | — | — | — | — | — | 43× over |
| Nitrate Inorganic |
0.458 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 3.3× over |
| Nitrate and nitrite Inorganic |
0.357 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.5× over |
| Chlorate Disinfection byproduct |
135.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Dibromochloromethane Disinfection byproduct |
0.0483 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Vanadium Other |
3.53 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0284 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.0 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0223 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.121 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.616 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.144 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
7.29 ppb | — | — | — | — | — | — | Below guideline |
| Testosterone Other |
0.02 ppt | — | — | — | — | — | — | 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 ROSEVILLE.