Tap Water Results

Is Carol Stream, IL 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 Carol Stream Water System. 1 PFAS were detected below the limits.

2 public water systems serve parts of Carol Stream. The largest, Carol Stream Water System, serves 39,854 people. Your water bill names your system.

Largest system

Carol Stream Water System

39,854 people · Purchased surface water · EPA ID IL0430200

Buys treated water from Du Page Water Commission.

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
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: 1.05 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: 0

Across Illinois, 13 of 479 water systems EPA tested had PFAS above a 2024 federal limit, and 18 systems were above the lead action level in results from the last five years. Illinois results.

Carol Stream homes and lead pipes

38%
of homes built before 1980 (Illinois 64%, US 50%)
2%
built before 1950 (Illinois 26%)
33%
of households rent (Illinois 33%)

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 Carol Stream village (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Carol Stream

  • Illinois American Water – Liberty Ridge West
    3,307 people · Purchased surface water · Illinois · reported ZIPs here
    No PFAS above limits

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Glendale Heights 3 mi
Glendale Heights Water System
Glendale Heights Water SystemNone above limits0 ppb
Bartlett 4 mi
Bartlett Water System
Bartlett Water SystemNone above limits20 ppb
Hanover Park 4 mi
Hanover Park Water System
Hanover Park Water SystemNone above limits2.47 ppb
Wheaton 5 mi
Wheaton Water System
Wheaton Water SystemNone above limits2.32 ppb
West Chicago 5 mi
West Chicago Water System
West Chicago Water SystemNone above limits0.52 ppb
Glen Ellyn 5 mi
Glen Ellyn Water System
Glen Ellyn Water SystemNone above limits1.87 ppb
Carol Stream ZIP codes (1)
  • 60188

Questions

Is Carol Stream tap water safe to drink?

Carol Stream Water System 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 Carol Stream, IL?

2 public water systems serve parts of Carol Stream. The largest is Carol Stream Water System (39,854 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Carol Stream tap water have PFAS?

Carol Stream Water System had 1 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Carol Stream homes have lead pipes?

Census estimates put 38% of Carol Stream homes as built before 1980 (Illinois: 64%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Carol Stream Water System'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.