- EPA's UCMR 5 testing looked for 30 contaminants here and found 3.
- Lithium: found in 8 of 10 samples, average 15.3 µg/L, highest 26 µg/L (EPA UCMR 5 testing, Jun 2023–Sep 2024)
- PFHxA (a PFAS): found in 1 of 10 samples, average 0.30 ppt, highest 3.5 ppt (EPA UCMR 5 testing, Jun 2023–Sep 2024)
- PFPeA (a PFAS): found in 1 of 10 samples, average 0.30 ppt, highest 3.5 ppt (EPA UCMR 5 testing, Jun 2023–Sep 2024)
- Lead, 90th percentile: 6.88 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jul 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink Lake Zurich tap water? What EPA records show
EPA IL0970850 · serves Lake Zurich, IL · about 19,759 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Lake Zurich (EPA IL0970850)
EPA data as of October 14, 2026. For Lake Zurich's main utility, Lake Zurich: We found no health-based violations in EPA's records for this system (IL0970850) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Lake Zurich, as of October 14, 2026
We found no health-based violations in EPA's records for this system (IL0970850) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Lake Zurich (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 6.88 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jul 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 3.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Lake Zurich use chloramine?
We didn't find chloramine in Lake Zurich's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.