Water Quality Report · Updated May 12, 2026
SOUTH ADAMS COUNTY WSD
SOUTH ADAMS COUNTY WSD delivers tap water graded D (62/100) by TapWaterSafety.org. The utility serves approximately 75,559 residents in COMMERCE CITY, Colorado using surface water (purchased). The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. For questions, the utility can be reached at 720-206-0565.
Is COMMERCE CITY tap water safe to drink?
SOUTH ADAMS COUNTY WSD delivers tap water that earns a grade of D (62/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including arsenic significantly above health guideline.
The utility serves 75,559 residents in COMMERCE CITY, drawing from surface water (purchased).
Public testing data identifies 15 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Haloacetic acids (HAA5), Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Dibromoacetic acid, Trichloroacetic acid, Bromodichloromethane, Dibromochloromethane, Dichloroacetic acid, Nitrate, Nitrate and nitrite, Bromoform, Chloroform, Chromium (hexavalent), 1,4-Dioxane. 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 COMMERCE CITY residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for SOUTH ADAMS COUNTY WSD.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 4.75 ppb, 1188x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 25.7 ppb, 257x above the EWG health guideline of 0.1 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 15.0 ppb, 250x above the EWG health guideline of 0.06 ppb.
Contact SOUTH ADAMS COUNTY WSD
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 COMMERCE CITY
Filters matched to the specific contaminants in this water supply.
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 62/100 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 |
4.75 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1188× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
25.7 ppb | 0.1 | 60.0 | 60 | — | — | — | 257× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
15.0 ppb | 0.06 | — | — | — | — | — | 250× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
35.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 235× over |
| Dibromoacetic acid Disinfection byproduct |
4.07 ppb | 0.03 | — | — | — | — | — | 136× over |
| Trichloroacetic acid Disinfection byproduct |
12.4 ppb | 0.1 | — | — | — | — | — | 124× over |
| Bromodichloromethane Disinfection byproduct |
5.69 ppb | 0.06 | — | — | — | — | — | 95× over |
| Dibromochloromethane Disinfection byproduct |
8.8 ppb | 0.1 | — | — | — | — | — | 88× over |
| Dichloroacetic acid Disinfection byproduct |
7.94 ppb | 0.2 | — | — | — | — | — | 40× over |
| Nitrate Inorganic |
4.25 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 30× over |
| Nitrate and nitrite Inorganic |
4.25 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 30× over |
| Bromoform Disinfection byproduct |
12.6 ppb | 0.5 | — | — | — | — | — | 25× over |
| Chloroform Disinfection byproduct |
8.2 ppb | 0.4 | — | — | — | — | — | 20× over |
| Chromium (hexavalent) Heavy metal |
0.31 ppb | 0.02 | — | — | — | — | — | 16× over |
| 1,4-Dioxane Semi-volatile organic compound |
1.1 ppb | 0.35 | — | — | 50 | 1 | — | 3.1× over |
| Uranium Radiological |
0.37 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Chlorate Disinfection byproduct |
42.1 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
4.75 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Molybdenum Other |
2.86 ppb | 40.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.15 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
1.15 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
4.57 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
0.925 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
19.8 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.219 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
3.86 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
2.85 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.11 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.647 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
4.75 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.617 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
17.5 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.
SOUTH ADAMS COUNTY WSD service area
This water system serves 1 community in Adams County, Colorado. Click any city for its dedicated tap water quality page.
Find the right filter for COMMERCE CITY water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.