What was found in Grand Junction'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 | 100 µg/L 1% of the EPA limit 10000 µg/L Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 1000 µg/L — GRAND JUNCTION CITY OF · 26,000 people · 2019 | 3/6 | SYR4 |
| Fluoride | 691 µg/L 17% of the EPA limit 4000 µg/L Main supplier: UTE WCD · 92,580 people · 2017
Highest in the city: 790.5 µg/L — GRAND JUNCTION CITY OF · 26,000 people · 2019 | 3/6 | SYR4 |
| Nitrate-Nitrite | 140 µg/L 1.4% of the EPA limit 10000 µg/L Highest in the city: GRAND JUNCTION CITY OF · 26,000 people · 2017 | 2/6 | SYR4 |
| TTHM | 50.345 µg/L 63% of the EPA limit 80 µg/L Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 68.064 µg/L — KANNAH CREEK · 435 people · 2019 | 3/6 | SYR4 |
| Nitrite | 50 µg/L 5% of the EPA limit 1000 µg/L Highest in the city: GRAND JUNCTION CITY OF · 26,000 people · 2017 | 1/6 | SYR4 |
| Chloroform | 26.29 µg/L No EPA limit set Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 48.995 µg/L — GRAND JUNCTION CITY OF · 26,000 people · 2019 | 3/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 40.025 µg/L 67% of the EPA limit 60 µg/L Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 43.555 µg/L — GRAND JUNCTION CITY OF · 26,000 people · 2019 | 3/6 | SYR4 |
| Barium | 40.75 µg/L 2% of the EPA limit 2000 µg/L Highest in the city: KANNAH CREEK · 435 people · 2019 | 2/6 | SYR4 |
| Trichloroacetic Acid | 20.395 µg/L No EPA limit set Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 24.845 µg/L — GRAND JUNCTION CITY OF · 26,000 people · 2019 | 3/6 | SYR4 |
| Dichloroacetic Acid | 21.18 µg/L No EPA limit set Main supplier: UTE WCD · 92,580 people · 2019 | 3/6 | SYR4 |
| Bromodichloromethane | 3.459 µg/L No EPA limit set Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 5.646 µg/L — GRAND JUNCTION CITY OF · 26,000 people · 2019 | 3/6 | SYR4 |
| Dibromoacetic Acid | 0.3260 µg/L No EPA limit set Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 1.55 µg/L — GRAND JUNCTION CITY OF · 26,000 people · 2019 | 3/6 | SYR4 |
| Monochloroacetic Acid | 1.123 µg/L No EPA limit set Main supplier: UTE WCD · 92,580 people · 2019
Highest in the city: 1.471 µg/L — KANNAH CREEK · 435 people · 2019 | 3/6 | SYR4 |
| Vinyl Chloride | 1.2 µg/L 60% of the EPA limit 2 µg/L Highest in the city: GRAND JUNCTION CITY OF · 26,000 people · 2019 | 1/6 | SYR4 |
| Xylenes, Total | 0.8100 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: GRAND JUNCTION CITY OF · 26,000 people · 2019 | 1/6 | SYR4 |
| Dibromochloromethane | 0.7740 µg/L No EPA limit set Highest in the city: GRAND JUNCTION CITY OF · 26,000 people · 2019 | 2/6 | SYR4 |
| Toluene | 0.5200 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the city: GRAND JUNCTION CITY OF · 26,000 people · 2019 | 1/6 | SYR4 |
| Ethylbenzene | 0.2200 µg/L 0% of the EPA limit 700 µg/L Highest in the city: GRAND JUNCTION CITY OF · 26,000 people · 2019 | 1/6 | SYR4 |
| Lead | 0.0014 mg/L 9.3% of the EPA limit 0.0150 mg/L Main supplier: UTE WCD · 92,580 people · 2025
Highest in the city: 0.0082 mg/L — GRAND JUNCTION CITY OF · 26,000 people · 2025 | 5/6 | 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 Grand Junction
| Supplier | Population served |
|---|---|
| UTE WCD | 92,580 |
| GRAND JUNCTION CITY OF | 26,000 |
| KANNAH CREEK | 435 |
| TWIN RIVERS MHP, LLC | 67 |
| LITTLE PARK WATER COOP | 51 |
| PARK PLACE MHP | 35 |
Frequently asked questions about Grand Junction tap water
Is Grand Junction tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Grand Junction. 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 Grand Junction?
6 public water suppliers report drinking-water monitoring for Grand Junction, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Grand Junction's water?
The contaminants EPA monitoring detected in Grand Junction include Nitrate, Fluoride, Nitrate-Nitrite, TTHM, Nitrite. 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.