Is Beloit, WI tap water safe?

Data: U.S. EPA · How we read the data · How we check it

No federal limits exceeded in EPA data for City of Beloit. 1 PFAS were detected below the limits.

City of Beloit supplies Beloit (36,677 people).

Water system

City of Beloit

36,677 people · Groundwater · EPA ID WI1540112

PFAS	Highest average	Limit	Status
PFOA Not detected	–	4 ppt	Not detected
PFOS Not detected	–	4 ppt	Not detected
PFHxS Not detected	–	10 ppt	Not detected
PFNA Not detected	–	10 ppt	Not detected
HFPO-DA (GenX) Not detected	–	10 ppt	Not detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 4.5 ppb at the 90th percentile (Sep 2023, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 2

Across Wisconsin, 18 of 196 water systems EPA tested had PFAS above a 2024 federal limit, and 4 systems were above the lead action level in results from the last five years. Wisconsin results.

Beloit homes and lead pipes

78%

of homes built before 1980 (Wisconsin 57%, US 50%)

39%

built before 1950 (Wisconsin 23%)

41%

of households rent (Wisconsin 32%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Beloit city (tables B25034, B25003). Estimates for small places have a margin of error.

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Janesville 11 mi Janesville Water Utility	Janesville Water Utility	None above limits	2.4 ppb
Fitchburg 38 mi Fitchburg Utility District 1	Fitchburg Utility District 1	None above limits	2.3 ppb
Madison 44 mi Madison Water Utility	Madison Water Utility	None above limits	1.8 ppb
Muskego 51 mi Muskego Water Utility	Muskego Water Utility	None above limits	3.89 ppb
Waukesha 52 mi Waukesha Water Utility	Waukesha Water Utility	None above limits	0.56 ppb
New Berlin 55 mi New Berlin Water Utility	New Berlin Water Utility	None above limits	0.33 ppb

Beloit ZIP codes (1)

53511

Questions

Is Beloit tap water safe to drink?

City of Beloit had 2 health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Beloit, WI?

City of Beloit, which serves 36,677 people.

Does Beloit tap water have PFAS?

City of Beloit had 1 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Beloit homes have lead pipes?

Census estimates put 78% of Beloit homes as built before 1980 (Wisconsin: 57%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. City of Beloit's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.