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Tap water quality report

Dayton, WY

EPA monitoring detected 12 contaminants across the 1 water supplier serving Dayton. 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.

1
water supplier
824
people served
12
contaminants found
Wyoming rankings Lead in Wyoming PFAS in Wyoming

What was found in Dayton'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
Nitrate-Nitrite
1300 µg/L 13%
of the EPA limit 10000 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2019
1/1 SYR4
Fluoride
132.2 µg/L 3.3%
of the EPA limit 4000 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2019
1/1 SYR4
Copper
113 µg/L 8.7%
of the EPA limit 1300 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2017
1/1 SYR4
Cyanide
32 µg/L 16%
of the EPA limit 200 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2019
1/1 SYR4
TTHM
31 µg/L 39%
of the EPA limit 80 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
20.6 µg/L 34%
of the EPA limit 60 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2019
1/1 SYR4
Lead
3 µg/L 20%
of the EPA limit 15 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2017
1/1 SYR4
Thallium, Total
1.31 µg/L 66%
of the EPA limit 2 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2019
1/1 SYR4
Hexachlorobenzene
0.0200 µg/L 2%
of the EPA limit 1 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2018
1/1 SYR4
Bhc-Gamma
0.0048 µg/L 2.4%
of the EPA limit 0.2000 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2018
1/1 SYR4
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2023
1/1 LCR
Heptachlor Epoxide
0.0037 µg/L 1.9%
of the EPA limit 0.2000 µg/L
Main supplier: DAYTON, TOWN OF · 824 people · 2018
1/1 SYR4
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 Dayton

SupplierPopulation served
DAYTON, TOWN OF 824

Frequently asked questions about Dayton tap water

Is Dayton tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Dayton. 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 Dayton?

1 public water supplier report drinking-water monitoring for Dayton, Wyoming to the EPA. Each is listed above with its population served.

What contaminants are in Dayton's water?

The contaminants EPA monitoring detected in Dayton include Nitrate-Nitrite, Fluoride, Copper, Cyanide, 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.