Water Quality Report · Updated May 12, 2026
SUBURBAN WATER SYSTEMS-LA MIRADA
SUBURBAN WATER SYSTEMS-LA MIRADA delivers tap water graded F (47/100) by TapWaterSafety.org. The utility serves approximately 56,793 residents in COVINA, California using surface water (purchased). The most significant water quality concerns are: PFAS contamination; Arsenic significantly above health guideline; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. For questions, the utility can be reached at 626-543-2532.
Is COVINA tap water safe to drink?
SUBURBAN WATER SYSTEMS-LA MIRADA delivers tap water that earns a grade of F (47/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 56,793 residents in COVINA, drawing from surface water (purchased).
Public testing data identifies 18 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Perfluorohexane sulfonate (PFHXS), Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Bromodichloromethane, Perfluorodecanoic acid (PFDA), Dibromochloromethane, Dibromoacetic acid, Chromium (hexavalent), Perfluorononanoic acid (PFNA), Perfluorooctanoic acid (PFOA), Bromoform, Trichloroacetic acid, Chloroform, Perfluorooctane sulfonate (PFOS), Dichloroacetic acid, Uranium. 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 COVINA residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for SUBURBAN WATER SYSTEMS-LA MIRADA.
PFAS contamination
Severe concernPerfluorononanoic acid (PFNA), Perfluorooctane 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 5.2 ppb, 1300x above the EWG health guideline of 0.004 ppb.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.7 ppt, 700x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 24.2 ppb, 403x above the EWG health guideline of 0.06 ppb.
Contact SUBURBAN WATER SYSTEMS-LA MIRADA
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 COVINA
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 47/100 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 |
5.2 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1300× over |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.7 ppt | 0.001 | 10.0 | — | — | — | — | 700× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
24.2 ppb | 0.06 | — | — | — | — | — | 403× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
26.5 ppb | 0.15 | 80.0 | 100 | — | — | — | 176× over |
| Bromodichloromethane Disinfection byproduct |
6.5 ppb | 0.06 | — | — | — | — | — | 108× over |
| Perfluorodecanoic acid (PFDA) PFAS |
0.65 ppt | 0.006 | — | — | — | — | — | 108× over |
| Dibromochloromethane Disinfection byproduct |
8.96 ppb | 0.1 | — | — | — | — | — | 90× over |
| Dibromoacetic acid Disinfection byproduct |
2.65 ppb | 0.03 | — | — | — | — | — | 88× over |
| Chromium (hexavalent) Heavy metal |
0.623 ppb | 0.02 | — | — | — | — | — | 31× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.14 ppt | 0.006 | 10.0 | — | — | — | — | 23× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.7 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 19× over |
| Bromoform Disinfection byproduct |
5.83 ppb | 0.5 | — | — | — | — | — | 12× over |
| Trichloroacetic acid Disinfection byproduct |
1.17 ppb | 0.1 | — | — | — | — | — | 12× over |
| Chloroform Disinfection byproduct |
4.59 ppb | 0.4 | — | — | — | — | — | 11× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
3.27 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 11× over |
| Dichloroacetic acid Disinfection byproduct |
1.29 ppb | 0.2 | — | — | — | — | — | 6.4× over |
| Uranium Radiological |
1.3 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 3.0× over |
| Molybdenum Other |
22.1 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
105.2 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.171 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Manganese Heavy metal |
39.3 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perchlorate Disinfection byproduct |
0.175 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.0075 ppb | 0.06 | 5.0 | — | — | — | — | Below guideline |
| Vanadium Other |
1.36 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chloromethane Other |
0.0168 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Cobalt Other |
0.388 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
3.2 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
2.32 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.55 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.897 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.548 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.15 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.41 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.176 ppb | — | — | — | — | — | — | 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.
SUBURBAN WATER SYSTEMS-LA MIRADA 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 COVINA water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.