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Tap water quality report

Egan, SD

EPA monitoring detected 12 contaminants across the 4 water suppliers serving Egan. 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.

4
water suppliers
6,585
people served
12
contaminants found
South Dakota rankings Lead in South Dakota PFAS in South Dakota

What was found in Egan'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
6000 µg/L 60%
of the EPA limit 10000 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2019
1/4 SYR4
Copper
30.49999999999997 µg/L 2.3%
of the EPA limit 1300 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2018
Highest in the city: 121.99999999999989 µg/L — CHESTER SANITARY DISTRICT · 363 people · 2018
4/4 SYR4
TTHM
45.775 µg/L 57%
of the EPA limit 80 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2019
Highest in the city: 77.71999999999998 µg/L — WENTWORTH · 181 people · 2018
4/4 SYR4
Lithium
36.1 µg/L
No EPA limit set
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2024
1/4 UCMR-5
Barium
21.745 µg/L 1.1%
of the EPA limit 2000 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017
1/4 SYR4
Total Haloacetic Acids (HAA5)
12.239999999999998 µg/L 20%
of the EPA limit 60 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2019
Highest in the city: 17.93999999999999 µg/L — WENTWORTH · 181 people · 2018
4/4 SYR4
Lead
3.174999999999996 µg/L 21%
of the EPA limit 15 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2018
Highest in the city: 5.779999999999999 µg/L — CHESTER SANITARY DISTRICT · 363 people · 2018
4/4 SYR4
Selenium
3.359 µg/L 6.7%
of the EPA limit 50 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017
1/4 SYR4
Gross Alpha, Excl. Radon And U
1.6 pCi/L 11%
of the EPA limit 15 pCi/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2018
1/4 SYR4
Chromium
0.7380 µg/L 0.7%
of the EPA limit 100 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017
1/4 SYR4
Antimony, Total
0.5000 µg/L 8.3%
of the EPA limit 6 µg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017
1/4 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2024
4/4 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 Egan

SupplierPopulation served
BIG SIOUX COMMUNITY WATER SYSTEM 5,800
CHESTER SANITARY DISTRICT 363
EGAN 241
WENTWORTH 181

Frequently asked questions about Egan tap water

Is Egan tap water safe to drink?

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

4 public water suppliers report drinking-water monitoring for Egan, South Dakota to the EPA. Each is listed above with its population served.

What contaminants are in Egan's water?

The contaminants EPA monitoring detected in Egan include Nitrate, Copper, TTHM, Lithium, Barium. 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.