Is Zionsville, IN tap water safe?

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

No federal limits exceeded in EPA data for Citizens Water – Whitestown. 4 PFAS were detected below the limits.

3 public water systems serve parts of Zionsville. The largest, Citizens Water – Whitestown, serves 15,695 people. Your water bill names your system.

Largest system

Citizens Water – Whitestown

15,695 people · Purchased surface water · EPA ID IN5206014

Buys treated water from Citizens Water – Indianapolis.

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: 0.33 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 1

Across Indiana, 6 of 219 water systems EPA tested had PFAS above a 2024 federal limit, and 6 systems were above the lead action level in results from the last five years. Indiana results.

Zionsville homes and lead pipes

24%

of homes built before 1980 (Indiana 55%, US 50%)

built before 1950 (Indiana 21%)

16%

of households rent (Indiana 29%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.

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

Other water systems serving Zionsville

Pine Ridge Water System
135 people · Groundwater · Indiana · lists this city
Not in EPA's PFAS sample
Zionsville MHP Trust
57 people · Groundwater · Indiana · lists this city
Coliform bacteria violations

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Carmel 9 mi Carmel Water Department	Carmel Water Department	None above limits	2.94 ppb
Westfield 9 mi Carmel Water Department	Carmel Water Department	None above limits	2.94 ppb
Brownsburg 11 mi Brownsburg Water Works	Brownsburg Water Works	None above limits	0 ppb
Noblesville 17 mi Indiana American Water – Noblesville	Indiana American Water – Noblesville	None above limits	3 ppb
Indianapolis 17 mi Citizens Water – Indianapolis	Citizens Water – Indianapolis	None above limits	3.44 ppb
Lawrence 20 mi City of Lawrence Utilities	City of Lawrence Utilities	None above limits	0.76 ppb

Zionsville ZIP codes (2)

46075
46077

Questions

Is Zionsville tap water safe to drink?

Citizens Water – Whitestown had 1 health-based violation 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 Zionsville, IN?

3 public water systems serve parts of Zionsville. The largest is Citizens Water – Whitestown (15,695 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Zionsville tap water have PFAS?

Citizens Water – Whitestown had 4 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Zionsville homes have lead pipes?

Census estimates put 24% of Zionsville homes as built before 1980 (Indiana: 55%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Citizens Water – Whitestown'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.