Water Quality Report · Updated October 07, 2026
SUBURBAN WATER SYSTEMS-SAN JOSE
SUBURBAN WATER SYSTEMS-SAN JOSE delivers tap water graded C (66/100) by TapWaterSafety.org. The utility serves approximately 168,843 residents in COVINA, California using surface water (purchased). The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Chromium (hexavalent) significantly above health guideline; Arsenic 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-SAN JOSE delivers tap water that earns a grade of C (66/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 168,843 residents in COVINA, drawing from surface water (purchased).
Public testing data identifies 17 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA5), Chromium (hexavalent), Arsenic, Total trihalomethanes (TTHMs), Haloacetic acids (HAA9), Dibromoacetic acid, Bromodichloromethane, Dibromochloromethane, Nitrate, Dichloroacetic acid, Chloroform, Nitrate and nitrite, Trichloroacetic acid, Bromoform, Uranium, Perchlorate, Trichloroethylene. 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.
EPA compliance record
Official U.S. EPA records for SUBURBAN WATER SYSTEMS-SAN JOSE (system ID CA1910205) 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.
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-SAN JOSE.
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.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 5.38 ppb, 269x above the EWG health guideline of 0.02 ppb.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 0.585 ppb, 146x above the EWG health guideline of 0.004 ppb.
Contact SUBURBAN WATER SYSTEMS-SAN JOSE
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.
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.
Score breakdown
This utility's overall score of 66/100 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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Chromium (hexavalent) Heavy metal |
5.38 ppb | 0.02 | — | — | — | — | — | 269× over |
| Arsenic Heavy metal |
0.585 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 146× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
18.9 ppb | 0.15 | 80.0 | 100 | — | — | — | 126× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
6.65 ppb | 0.06 | — | — | — | — | — | 111× over |
| Dibromoacetic acid Disinfection byproduct |
2.43 ppb | 0.03 | — | — | — | — | — | 81× over |
| Bromodichloromethane Disinfection byproduct |
4.63 ppb | 0.06 | — | — | — | — | — | 77× over |
| Dibromochloromethane Disinfection byproduct |
6.15 ppb | 0.1 | — | — | — | — | — | 61× over |
| Nitrate Inorganic |
4.03 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 29× over |
| Dichloroacetic acid Disinfection byproduct |
2.72 ppb | 0.2 | — | — | — | — | — | 14× over |
| Chloroform Disinfection byproduct |
4.19 ppb | 0.4 | — | — | — | — | — | 10× over |
| Nitrate and nitrite Inorganic |
1.2 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 8.6× over |
| Trichloroacetic acid Disinfection byproduct |
0.839 ppb | 0.1 | — | — | — | — | — | 8.4× over |
| Bromoform Disinfection byproduct |
3.88 ppb | 0.5 | — | — | — | — | — | 7.8× over |
| Uranium Radiological |
1.1 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 2.6× over |
| Perchlorate Disinfection byproduct |
1.66 ppb | 1.0 | — | — | — | — | — | 1.7× over |
| Trichloroethylene Volatile organic compound |
0.589 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | 1.5× over |
| Chlorate Disinfection byproduct |
94.6 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
5.08 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
5.59 ppb | 40.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0312 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Barium Heavy metal |
41.5 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| N-Nitrosodimethylamine (NDMA) Other |
0.164 ppt | 3.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
3.07 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Selenium Heavy metal |
0.143 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Bromochloromethane Other |
0.000258 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.16 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Chloromethane Other |
0.00283 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.025 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.52 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.000529 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Butylated hydroxyanisole Other |
0.00265 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
2.73 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.351 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.
SUBURBAN WATER SYSTEMS-SAN JOSE 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.