Tap Water Quality Report
Tap water quality in PARAMOUNT, California
Tap water in PARAMOUNT, California receives a grade of F (57/100) from TapWaterSafety.org. It's served by PARAMOUNT - CITY, WATER DEPT.. The most significant water quality concerns are: PFAS contamination; Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Perfluorohexane sulfonate (PFHXS) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in PARAMOUNT's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving PARAMOUNT.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS) 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 9.01 ppb, 2253x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 35.8 ppb, 358x above the EWG health guideline of 0.1 ppb.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.339 ppt, 339x above the EWG health guideline of 0.001 ppt.
EPA compliance record
Official U.S. EPA records for PARAMOUNT - CITY, WATER DEPT. (system ID CA1910105) 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 PARAMOUNT
Filters matched to the specific contaminants in PARAMOUNT'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 PARAMOUNT'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 |
9.01 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 2253× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
35.8 ppb | 0.1 | 60.0 | 60 | — | — | — | 358× over |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.339 ppt | 0.001 | 10.0 | — | — | — | — | 339× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
13.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 89× over |
| Bromodichloromethane Disinfection byproduct |
3.96 ppb | 0.06 | — | — | — | — | — | 66× over |
| Dibromochloromethane Disinfection byproduct |
4.61 ppb | 0.1 | — | — | — | — | — | 46× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
1.79 ppb | 0.06 | — | — | — | — | — | 30× over |
| Dibromoacetic acid Disinfection byproduct |
0.446 ppb | 0.03 | — | — | — | — | — | 15× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
2.91 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 9.7× over |
| Chloroform Disinfection byproduct |
2.93 ppb | 0.4 | — | — | — | — | — | 7.3× over |
| Trichloroacetic acid Disinfection byproduct |
0.693 ppb | 0.1 | — | — | — | — | — | 6.9× over |
| Uranium Radiological |
2.1 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 4.9× over |
| Chromium (hexavalent) Heavy metal |
0.0871 ppb | 0.02 | — | — | — | — | — | 4.4× over |
| Dichloroacetic acid Disinfection byproduct |
0.879 ppb | 0.2 | — | — | — | — | — | 4.4× over |
| 1,4-Dioxane Semi-volatile organic compound |
1.4 ppb | 0.35 | — | — | 50 | 1 | — | 4.0× over |
| Bromoform Disinfection byproduct |
1.43 ppb | 0.5 | — | — | — | — | — | 2.9× over |
| Nitrate and nitrite* Inorganic |
0.287 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.0× over |
| Radium, combined (-226 and -228)* Radiological |
0.07 pCi/L | 0.05 | 5.0 | — | — | — | — | 1.4× over |
| Nitrate Inorganic |
0.134 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Chlorate Disinfection byproduct |
173.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
153.3 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
5.28 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
9.38 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
1.18 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
9.33 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.132 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0292 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.594 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.000941 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.247 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.29 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 PARAMOUNT - CITY, WATER DEPT..