Tap Water Quality Report
Tap water quality in COMMERCE CITY, Colorado
Tap water in COMMERCE CITY, Colorado receives a grade of D (62/100) from TapWaterSafety.org. It's served by SOUTH ADAMS COUNTY WSD. 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. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in COMMERCE CITY's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving COMMERCE CITY.
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.
EPA compliance record
Official U.S. EPA records for SOUTH ADAMS COUNTY WSD (system ID CO0101140) 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 COMMERCE CITY
Filters matched to the specific contaminants in COMMERCE CITY's water supply.
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 COMMERCE CITY'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 |
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, 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 SOUTH ADAMS COUNTY WSD.