Tap Water Results

Is Algonquin, 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 Algonquin Water System.

Algonquin Water System supplies Algonquin (30,700 people).

Water system

Algonquin Water System

30,700 people · Groundwater · EPA ID IL1110050

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: 1.96 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.

Algonquin homes and lead pipes

20%
of homes built before 1980 (Illinois 64%, US 50%)
5%
built before 1950 (Illinois 26%)
12%
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 Algonquin village (tables B25034, B25003). Estimates for small places have a margin of error.

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Lake in the Hills 1 mi
Lake in the Hills Water System
Lake in the Hills Water SystemNone above limits2.7 ppb
Carpentersville 3 mi
Carpentersville Water System
Carpentersville Water SystemNone above limits1.1 ppb
Crystal Lake 5 mi
Crystal Lake Water System
Crystal Lake Water SystemNone above limits6.8 ppb
Huntley 6 mi
Huntley Water System
Huntley Water SystemNone above limits1.1 ppb
Elgin 9 mi
Elgin Water System
Elgin Water SystemNone above limits18.5 ppb
Hoffman Estates 11 mi
Hoffman Estates Water System
Hoffman Estates Water SystemNone above limits1.4 ppb
Algonquin ZIP codes (1)
  • 60102

Questions

Is Algonquin tap water safe to drink?

Algonquin 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 Algonquin, IL?

Algonquin Water System, which serves 30,700 people.

Does Algonquin tap water have PFAS?

None detected above EPA's reporting limits. Algonquin 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 Algonquin homes have lead pipes?

Census estimates put 20% of Algonquin 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. Algonquin 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.