Tap Water Results

Is Woodstock, 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 Woodstock Water System.

Woodstock Water System supplies Woodstock (25,630 people).

Water system

Woodstock Water System

25,630 people · Groundwater · EPA ID IL1110950

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: 7 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 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.

Woodstock homes and lead pipes

39%
of homes built before 1980 (Illinois 64%, US 50%)
18%
built before 1950 (Illinois 26%)
28%
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. How to check your own line.

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

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Crystal Lake 7 mi
Crystal Lake Water System
Crystal Lake Water SystemNone above limits6.8 ppb
McHenry 8 mi
McHenry Water System
McHenry Water SystemNone above limits6.7 ppb
Huntley 10 mi
Huntley Water System
Huntley Water SystemNone above limits1.1 ppb
Lake in the Hills 11 mi
Lake in the Hills Water System
Lake in the Hills Water SystemNone above limits2.7 ppb
Algonquin 12 mi
Algonquin Water System
Algonquin Water SystemNone above limits1.96 ppb
Carpentersville 15 mi
Carpentersville Water System
Carpentersville Water SystemNone above limits1.1 ppb
Woodstock ZIP codes (1)
  • 60098

Questions

Is Woodstock tap water safe to drink?

Woodstock Water System 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 Woodstock, IL?

Woodstock Water System, which serves 25,630 people.

Does Woodstock tap water have PFAS?

None detected above EPA's reporting limits. Woodstock Water System had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Woodstock homes have lead pipes?

Census estimates put 39% of Woodstock 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. Woodstock 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.