What was found in Commerce City's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 7481 µg/L 75% of the EPA limit 10000 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Nitrate | 7480.5 µg/L 75% of the EPA limit 10000 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Fluoride | 1518.5 µg/L 38% of the EPA limit 4000 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Barium | 91.30000000000001 µg/L 4.6% of the EPA limit 2000 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2017 | 1/1 | SYR4 |
| 1,1-Dichloroethylene | 76.1049999999993 µg/L 1087% of the EPA limit, at the 95th percentile of samples — 7 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| TTHM | 63.86 µg/L 80% of the EPA limit 80 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 40.565 µg/L 68% of the EPA limit 60 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Lithium | 26.7 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2024 | 1/1 | UCMR-5 |
| Combined Uranium | 20.15 µg/L 67% of the EPA limit 30 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2017 | 1/1 | SYR4 |
| Bromoform | 9.2 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2018 | 1/1 | SYR4 |
| Dibromochloromethane | 8.995 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2018 | 1/1 | SYR4 |
| Chloroform | 8.049999999999999 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2018 | 1/1 | SYR4 |
| Bromodichloromethane | 5.4 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2018 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.671499999999999 pCi/L 31% of the EPA limit 15 pCi/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2017 | 1/1 | SYR4 |
| Selenium | 3.6399999999999992 µg/L 7.3% of the EPA limit 50 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2017 | 1/1 | SYR4 |
| Xylenes, Total | 1.43 µg/L 0% of the EPA limit 10000 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 1.2799999999999998 µg/L 26% of the EPA limit 5 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.1 µg/L 18% of the EPA limit 6 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| cis-1,2-Dichloroethylene | 0.9700 µg/L 1.4% of the EPA limit 70 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2019 | 1/1 | SYR4 |
| Picloram | 0.2750 µg/L 0.1% of the EPA limit 500 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2018 | 1/1 | SYR4 |
| Cadmium | 0.2000 µg/L 4% of the EPA limit 5 µg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2017 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 0.1750 pCi/L 3.5% of the EPA limit 5 pCi/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2012 | 1/1 | SYR4 |
| Pfpea | 0.0114 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2024 | 1/1 | UCMR-5 |
| Pfba | 0.0095 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0044 µg/L No EPA limit set Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SOUTH ADAMS COUNTY WSD · 75,559 people · 2025 | 1/1 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Commerce City
| Supplier | Population served |
|---|---|
| SOUTH ADAMS COUNTY WSD | 75,559 |
Frequently asked questions about Commerce City tap water
Is Commerce City tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Commerce City. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Commerce City?
1 public water supplier report drinking-water monitoring for Commerce City, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Commerce City's water?
The contaminants EPA monitoring detected in Commerce City include Nitrate-Nitrite, Nitrate, Fluoride, Barium, 1,1-Dichloroethylene. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.