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Tap water quality report

Sister Bay, WI

EPA monitoring detected 21 contaminants across the 1 water supplier serving Sister Bay. 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
1,000
people served
21
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Sister Bay'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
2800 µg/L 28%
of the EPA limit 10000 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Nitrate-Nitrite
2050 µg/L 21%
of the EPA limit 10000 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
Copper
761.5 µg/L 59%
of the EPA limit 1300 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
Fluoride
540 µg/L 14%
of the EPA limit 4000 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
Barium
63.25 µg/L 3.2%
of the EPA limit 2000 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
TTHM
13.48 µg/L 17%
of the EPA limit 80 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Lead
9.715 µg/L 65%
of the EPA limit 15 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
Dibromochloromethane
4.93 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Bromoform
4.26 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Gross Alpha, Excl. Radon And U
3.95183 pCi/L 26%
of the EPA limit 15 pCi/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
Combined Radium (-226 And -228)
3.643 pCi/L 73%
of the EPA limit 5 pCi/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
Bromodichloromethane
3.475 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Chloroform
2.9 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
2.526 µg/L 4.2%
of the EPA limit 60 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Tetrachloroethylene
2.16 µg/L 43%
of the EPA limit 5 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2018
1/1 SYR4
Dibromoacetic Acid
1.28 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Combined Uranium
1.16 µg/L 3.9%
of the EPA limit 30 µg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2017
1/1 SYR4
Dichloroacetic Acid
0.9270 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Trichloroacetic Acid
0.6195 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Monobromoacetic Acid
0.4800 µg/L
No EPA limit set
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2019
1/1 SYR4
Lead
0.0061 mg/L 41%
of the EPA limit 0.0150 mg/L
Main supplier: SISTER BAY WATERWORKS · 1,000 people · 2023
1/1 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 Sister Bay

SupplierPopulation served
SISTER BAY WATERWORKS 1,000

Frequently asked questions about Sister Bay tap water

Is Sister Bay tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Sister Bay. 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 Sister Bay?

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

What contaminants are in Sister Bay's water?

The contaminants EPA monitoring detected in Sister Bay include Nitrate, Nitrate-Nitrite, Copper, Fluoride, 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.