- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- PFHxA (a PFAS): found in 1 of 4 samples, average 0.80 ppt, highest 3 ppt (EPA UCMR 5 testing, Mar 2024–Dec 2024)
- Lead, 90th percentile: 1.51 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 Markham tap water? What EPA records show
EPA IL0311770 · serves Markham, IL · about 12,500 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
Markham (EPA IL0311770)
EPA data as of October 14, 2026. For Markham's main utility, Markham: We found no health-based violations in EPA's records for this system (IL0311770) 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. This is public data, not a test of your tap.
What EPA records show for Markham, as of October 14, 2026
We found no health-based violations in EPA's records for this system (IL0311770) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Markham (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 1.51 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 1.
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 Markham use chloramine?
We didn't find chloramine in Markham's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.