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Tap water quality report

Wiley, CO

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Wiley. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
1,905
people served
21
contaminants found
Colorado rankings Lead in Colorado PFAS in Colorado

What was found in Wiley'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.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
3578 µg/L 89%
of the EPA limit 4000 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2018
2/2 SYR4
Nitrate
600 µg/L 6%
of the EPA limit 10000 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2019
1/2 SYR4
TTHM
53.685 µg/L 67%
of the EPA limit 80 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2019
Highest in the city: 67.72 µg/L — WILEY TOWN OF · 405 people · 2019
2/2 SYR4
Gross Beta Particle Activity
50.3 pCi/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2016
2/2 SYR4
Gross Alpha, Excl. Radon And U
50 pCi/L 333%
of the EPA limit, at the 95th percentile of samples — 15 pCi/L
Main supplier: MAY VALLEY WA · 1,500 people · 2019
2/2 SYR4
Bromoform
19.98 µg/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2019
Highest in the city: 45 µg/L — WILEY TOWN OF · 405 people · 2019
2/2 SYR4
Combined Radium (-226 And -228)
25 pCi/L 500%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Main supplier: MAY VALLEY WA · 1,500 people · 2019
2/2 SYR4
Dibromochloromethane
18.42 µg/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2019
Highest in the city: 18.66 µg/L — WILEY TOWN OF · 405 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
9.896 µg/L 16%
of the EPA limit 60 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2019
Highest in the city: 14.864 µg/L — WILEY TOWN OF · 405 people · 2019
2/2 SYR4
Bromodichloromethane
12.52 µg/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2019
2/2 SYR4
Chloroform
12.08 µg/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2019
2/2 SYR4
Barium
10.6 µg/L 0.5%
of the EPA limit 2000 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2018
2/2 SYR4
Selenium
5 µg/L 10%
of the EPA limit 50 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2018
Highest in the city: 10 µg/L — WILEY TOWN OF · 405 people · 2019
2/2 SYR4
Dibromoacetic Acid
3.65 µg/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2019
Highest in the city: 6.534 µg/L — WILEY TOWN OF · 405 people · 2019
2/2 SYR4
Arsenic
3.75 µg/L 38%
of the EPA limit 10 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2018
2/2 SYR4
Chromium
3 µg/L 3%
of the EPA limit 100 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2018
1/2 SYR4
Monobromoacetic Acid
2.925 µg/L
No EPA limit set
Highest in the city: WILEY TOWN OF · 405 people · 2019
1/2 SYR4
Monochloroacetic Acid
2.6 µg/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2019
2/2 SYR4
Dichloroacetic Acid
2.555 µg/L
No EPA limit set
Main supplier: MAY VALLEY WA · 1,500 people · 2019
1/2 SYR4
Toluene
1.365 µg/L 0.1%
of the EPA limit 1000 µg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2019
1/2 SYR4
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: MAY VALLEY WA · 1,500 people · 2025
2/2 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 Wiley

SupplierPopulation served
MAY VALLEY WA 1,500
WILEY TOWN OF 405

Frequently asked questions about Wiley tap water

Is Wiley tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Wiley. 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 Wiley?

2 public water suppliers report drinking-water monitoring for Wiley, Colorado to the EPA. Each is listed above with its population served.

What contaminants are in Wiley's water?

The contaminants EPA monitoring detected in Wiley include Fluoride, Nitrate, TTHM, Gross Beta Particle Activity, Gross Alpha, Excl. Radon And U. 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.