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Tap water quality report

Westport, SD

EPA monitoring detected 7 contaminants across the 2 water suppliers serving Westport. 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
188
people served
7
contaminants found
South Dakota rankings Lead in South Dakota PFAS in South Dakota

What was found in Westport'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
2600 µg/L 65%
of the EPA limit 4000 µg/L
Main supplier: LONG LAKE COLONY · 100 people · 2019
1/2 SYR4
Copper
50 µg/L 3.8%
of the EPA limit 1300 µg/L
Main supplier: LONG LAKE COLONY · 100 people · 2019
Highest in the city: 718.4999999999991 µg/L — WESTPORT SANITARY DISTRICT · 88 people · 2017
2/2 SYR4
Barium
21.7 µg/L 1.1%
of the EPA limit 2000 µg/L
Main supplier: LONG LAKE COLONY · 100 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
20.269999999999996 µg/L 34%
of the EPA limit 60 µg/L
Highest in the city: WESTPORT SANITARY DISTRICT · 88 people · 2019
1/2 SYR4
TTHM
11.809999999999999 µg/L 15%
of the EPA limit 80 µg/L
Highest in the city: WESTPORT SANITARY DISTRICT · 88 people · 2019
1/2 SYR4
Lead
8.029999999999994 µg/L 54%
of the EPA limit 15 µg/L
Main supplier: LONG LAKE COLONY · 100 people · 2019
2/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: LONG LAKE COLONY · 100 people · 2025
Highest in the city: 0.0020 mg/L — WESTPORT SANITARY DISTRICT · 88 people · 2024
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 Westport

SupplierPopulation served
LONG LAKE COLONY 100
WESTPORT SANITARY DISTRICT 88

Frequently asked questions about Westport tap water

Is Westport tap water safe to drink?

EPA testing detected 7 contaminants in the water serving Westport. 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 Westport?

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

What contaminants are in Westport's water?

The contaminants EPA monitoring detected in Westport include Fluoride, Copper, Barium, Total Haloacetic Acids (HAA5), 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.