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Tap water quality report

Markesan, WI

EPA monitoring detected 15 contaminants across the 1 water supplier serving Markesan. 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
1,365
people served
15
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Markesan'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
9100 µg/L 91%
of the EPA limit 10000 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Nitrate-Nitrite
8420 µg/L 84%
of the EPA limit 10000 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2017
1/1 SYR4
Copper
151 µg/L 12%
of the EPA limit 1300 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2017
1/1 SYR4
Fluoride
128 µg/L 3.2%
of the EPA limit 4000 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2017
1/1 SYR4
Barium
84.25 µg/L 4.2%
of the EPA limit 2000 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2017
1/1 SYR4
Lead
5.96 µg/L 40%
of the EPA limit 15 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2017
1/1 SYR4
TTHM
3.52 µg/L 4.4%
of the EPA limit 80 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
1.3875 pCi/L 28%
of the EPA limit 5 pCi/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2014
1/1 SYR4
Dibromochloromethane
1.285 µg/L
No EPA limit set
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Bromoform
1.0475 µg/L
No EPA limit set
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Bromodichloromethane
0.9770 µg/L
No EPA limit set
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
0.5595 µg/L 0.9%
of the EPA limit 60 µg/L
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Dibromoacetic Acid
0.5240 µg/L
No EPA limit set
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Dichloroacetic Acid
0.1800 µg/L
No EPA limit set
Main supplier: MARKESAN WATERWORKS · 1,365 people · 2019
1/1 SYR4
Lead
0.0071 mg/L 47%
of the EPA limit 0.0150 mg/L
Main supplier: MARKESAN WATERWORKS · 1,365 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 Markesan

SupplierPopulation served
MARKESAN WATERWORKS 1,365

Frequently asked questions about Markesan tap water

Is Markesan tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Markesan. 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 Markesan?

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

What contaminants are in Markesan's water?

The contaminants EPA monitoring detected in Markesan 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.