What was found in Douglas'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 | 970 µg/L 9.7% of the EPA limit 10000 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019
Highest in the city: 7402.5 µg/L — FAIRWAY ESTATES · 135 people · 2019 | 3/6 | SYR4 |
| Copper | 383.2 µg/L 29% of the EPA limit 1300 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2018
Highest in the city: 607.5 µg/L — SUNDANCE MEADOWS SPID · 50 people · 2018 | 6/6 | SYR4 |
| Fluoride | 590 µg/L 15% of the EPA limit 4000 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 3/6 | SYR4 |
| Barium | 100 µg/L 5% of the EPA limit 2000 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 1/6 | SYR4 |
| TTHM | 66.465 µg/L 83% of the EPA limit 80 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 6/6 | SYR4 |
| Chloroform | 46.4 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 6/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 33.83 µg/L 56% of the EPA limit 60 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 6/6 | SYR4 |
| Lead | 25 µg/L 167% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2018 | 6/6 | SYR4 |
| Combined Uranium | 14 µg/L 47% of the EPA limit 30 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019
Highest in the city: 22.315 µg/L — DOUGLAS KOA CG & PINE MEADOWS MHP · 165 people · 2018 | 3/6 | SYR4 |
| Bromodichloromethane | 17.5 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 6/6 | SYR4 |
| Trichloroacetic Acid | 13.55 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 2/6 | SYR4 |
| Arsenic | 7 µg/L 70% of the EPA limit 10 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019
Highest in the city: 13.4 µg/L — FAIRWAY ESTATES · 135 people · 2019 | 3/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 12.3 pCi/L 82% of the EPA limit 15 pCi/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 3/6 | SYR4 |
| Bromoform | 2.97 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019
Highest in the city: 11.64 µg/L — FAIRWAY ESTATES · 135 people · 2019 | 6/6 | SYR4 |
| Dibromochloromethane | 6.69 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019
Highest in the city: 9.075 µg/L — FAIRWAY ESTATES · 135 people · 2019 | 6/6 | SYR4 |
| Dichloroacetic Acid | 8.075 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 3/6 | SYR4 |
| Selenium | 3.8 µg/L 7.6% of the EPA limit 50 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019
Highest in the city: 5.75 µg/L — FAIRWAY ESTATES · 135 people · 2019 | 2/6 | SYR4 |
| Dibromoacetic Acid | 2.67 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019
Highest in the city: 3.975 µg/L — FAIRWAY ESTATES · 135 people · 2017 | 6/6 | SYR4 |
| Combined Radium (-226 And -228) | 3.71 pCi/L 74% of the EPA limit 5 pCi/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 3/6 | SYR4 |
| Monochloroacetic Acid | 1.995 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 1/6 | SYR4 |
| Cadmium | 1.6 µg/L 32% of the EPA limit 5 µg/L Highest in the city: FAIRWAY ESTATES · 135 people · 2019 | 1/6 | SYR4 |
| Antimony, Total | 1 µg/L 17% of the EPA limit 6 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 1/6 | SYR4 |
| Thallium, Total | 0.8000 µg/L 40% of the EPA limit 2 µg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 2/6 | SYR4 |
| Monobromoacetic Acid | 0.6160 µg/L No EPA limit set Main supplier: DOUGLAS, CITY OF · 6,400 people · 2019 | 2/6 | SYR4 |
| Lead | 0.0060 mg/L 40% of the EPA limit 0.0150 mg/L Main supplier: DOUGLAS, CITY OF · 6,400 people · 2024 | 6/6 | 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 Douglas
| Supplier | Population served |
|---|---|
| DOUGLAS, CITY OF | 6,400 |
| LONE TREE VILLAGE MHP | 475 |
| RIDGEWATER IMPROVEMENT DISTRICT | 218 |
| DOUGLAS KOA CG & PINE MEADOWS MHP | 165 |
| FAIRWAY ESTATES | 135 |
| SUNDANCE MEADOWS SPID | 50 |
Frequently asked questions about Douglas tap water
Is Douglas tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Douglas. 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 Douglas?
6 public water suppliers report drinking-water monitoring for Douglas, Wyoming to the EPA. Each is listed above with its population served.
What contaminants are in Douglas's water?
The contaminants EPA monitoring detected in Douglas include Nitrate-Nitrite, Copper, Fluoride, Barium, TTHM. 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.