Is Lake in the Hills, 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 Lake in the Hills Water System.
Lake in the Hills Water System supplies Lake in the Hills (28,661 people).
Water system
Lake in the Hills Water System
28,661 people · Groundwater · EPA ID IL1110400
Buys treated water from Huntley Water System.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
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: 2.7 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: 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.
Lake in the Hills homes and lead pipes
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 Lake in the Hills village (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Algonquin 1 mi Algonquin Water System | None above limits | 1.96 ppb |
| Crystal Lake 4 mi Crystal Lake Water System | None above limits | 6.8 ppb |
| Carpentersville 4 mi Carpentersville Water System | None above limits | 1.1 ppb |
| Huntley 6 mi Huntley Water System | None above limits | 1.1 ppb |
| Elgin 10 mi Elgin Water System | None above limits | 18.5 ppb |
| Woodstock 11 mi Woodstock Water System | None above limits | 7 ppb |
Lake in the Hills ZIP codes (1)
- 60156
Questions
Is Lake in the Hills tap water safe to drink?
Lake in the Hills 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 Lake in the Hills, IL?
Lake in the Hills Water System, which serves 28,661 people.
Does Lake in the Hills tap water have PFAS?
None detected above EPA's reporting limits. Lake in the Hills 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 Lake in the Hills homes have lead pipes?
Census estimates put 16% of Lake in the Hills 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. Lake in the Hills 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.