Tap Water Results

Is Westerville, OH tap water safe?

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

Summary

No federal limits exceeded in EPA data for Del-Co Water Company, Inc.. 5 PFAS were detected below the limits.

3 public water systems serve parts of Westerville. The largest, Del-Co Water Company, Inc., serves 150,000 people. Your water bill names your system.

Largest system

Del-Co Water Company, Inc.

150,000 people · Surface water · EPA ID OH2101412

PFASHighest averageLimitStatus
PFOA
One sample above limit
1.05 ppt4 pptOne sample above limit
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot 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: 0.82 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Full Del-Co Water Company, Inc. results

Across Ohio, 35 of 331 water systems EPA tested had PFAS above a 2024 federal limit, and 3 systems were above the lead action level in results from the last five years. Ohio results.

Westerville homes and lead pipes

46%
of homes built before 1980 (Ohio 63%, US 50%)
7%
built before 1950 (Ohio 25%)
28%
of households rent (Ohio 33%)

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

Other water systems serving Westerville

  • Westerville City Public Water System
    39,000 people · Surface water · Ohio · reported ZIPs here
    Total trihalomethanes (TTHM) violation
  • Aqua Ohio – Huber Ridge Public Water System
    5,393 people · Groundwater · Ohio · reported ZIPs here
    No PFAS above limits

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Gahanna 6 mi
Gahanna City Public Water System
Gahanna City Public Water SystemNone above limits0.5 ppb
Columbus 10 mi
Columbus Public Water System
Columbus Public Water SystemNone above limits1.2 ppb
Dublin 12 mi
Del-Co Water Company, Inc.
Del-Co Water Company, Inc.None above limits0.82 ppb
Reynoldsburg 13 mi
Reynoldsburg City Public Water System
Reynoldsburg City Public Water SystemNone above limits2.1 ppb
Delaware 14 mi
Delaware City Public Water System
Delaware City Public Water SystemNone above limits0 ppb
Pickerington 18 mi
Pickerington City Public Water System
Pickerington City Public Water SystemNone above limits0.6 ppb
Westerville ZIP codes (1)
  • 43081

Questions

Is Westerville tap water safe to drink?

Del-Co Water Company, Inc. has had no 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 Westerville, OH?

3 public water systems serve parts of Westerville. The largest is Del-Co Water Company, Inc. (150,000 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Westerville tap water have PFAS?

Del-Co Water Company, Inc. had 5 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Westerville homes have lead pipes?

Census estimates put 46% of Westerville homes as built before 1980 (Ohio: 63%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Del-Co Water Company, Inc.'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.