Is Plainfield, 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 Plainfield Water Works. 3 PFAS were detected below the limits.

2 public water systems serve parts of Plainfield. The largest, Plainfield Water Works, serves 34,477 people. Your water bill names your system.

Largest system

Plainfield Water Works

34,477 people · Groundwater · EPA ID IN5232020

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: 1.14 ppb at the 90th percentile (Nov 2026, 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.

Plainfield homes and lead pipes

28%

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

built before 1950 (Indiana 21%)

38%

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. 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 Plainfield town (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Plainfield

Plainfield Re-Entry Educational Facility Water System
4,500 people · Groundwater · Indiana · lists this city
Lead near 2027 level

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Brownsburg 10 mi Brownsburg Water Works	Brownsburg Water Works	None above limits	0 ppb
Indianapolis 13 mi Citizens Water – Indianapolis	Citizens Water – Indianapolis	None above limits	3.44 ppb
Greenwood 15 mi Indiana American Water – Johnson County	Indiana American Water – Johnson County	None above limits	2 ppb
Zionsville 21 mi Citizens Water – Whitestown	Citizens Water – Whitestown	None above limits	0.33 ppb
Franklin 22 mi Indiana American Water – Johnson County	Indiana American Water – Johnson County	None above limits	2 ppb
Carmel 22 mi Carmel Water Department	Carmel Water Department	None above limits	2.94 ppb

Plainfield ZIP codes (2)

46168
46231

Questions

Is Plainfield tap water safe to drink?

Plainfield Water Works 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 Plainfield, IN?

2 public water systems serve parts of Plainfield. The largest is Plainfield Water Works (34,477 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Plainfield tap water have PFAS?

Plainfield Water Works had 3 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Plainfield homes have lead pipes?

Census estimates put 28% of Plainfield 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. Plainfield Water Works'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.