Water Quality Report · Updated May 12, 2026
PARAMOUNT - CITY, WATER DEPT.
PARAMOUNT - CITY, WATER DEPT. delivers tap water graded F (53/100) by TapWaterSafety.org. The utility serves approximately 55,200 residents in PARAMOUNT, California using surface water (purchased). 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. For questions, the utility can be reached at 562-220-2100.
Is PARAMOUNT tap water safe to drink?
PARAMOUNT - CITY, WATER DEPT. delivers tap water that earns a grade of F (53/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 55,200 residents in PARAMOUNT, drawing from surface water (purchased).
Public testing data identifies 18 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Haloacetic acids (HAA5), Perfluorohexane sulfonate (PFHXS), Total trihalomethanes (TTHMs), Bromodichloromethane, Dibromochloromethane, Haloacetic acids (HAA9), Dibromoacetic acid, Perfluorooctane sulfonate (PFOS), Chloroform, Trichloroacetic acid, Uranium, Chromium (hexavalent), Dichloroacetic acid, 1,4-Dioxane, Bromoform, Nitrate and nitrite*, Radium, combined (-226 and -228)*. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for PARAMOUNT residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for PARAMOUNT - CITY, WATER DEPT..
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.
Contact PARAMOUNT - CITY, WATER DEPT.
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for PARAMOUNT
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 53/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
PARAMOUNT - CITY, WATER DEPT. service area
This water system serves 1 community in Los Angeles County, California. Click any city for its dedicated tap water quality page.
Find the right filter for PARAMOUNT water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.