Illinois · population 11,290
Lead pipes in Markham, IL
1,239 lead or galvanized lines to replace
Most of Markham (population 11,290) gets its water from Markham. That system reported 1,239 lead and 0 galvanized-requiring-replacement service lines out of 4,604, with 149 more of unknown material.
27% of Markham's service lines are lead or galvanized requiring replacement, higher than the Illinois average (17%) and higher than the national average (3.1%).
- Lead 27%
- Galvanized (replace) 0%
- Unknown 3.2%
- Non-lead 70%
Latest lead test for Markham (Jul 2025–Dec 2025): 1.5 ppb at the 90th percentile, against a 15 ppb federal action level. Full test history.
Compliance record: EPA lists 1 Lead and Copper Rule violation since 2015 for Markham.
Water systems serving Markham
| Water system | Lead | Galv. | Unknown | % lead |
|---|---|---|---|---|
| MarkhamMain system | 1,239 | 0 | 149 | 27% |
| HarveyServes nearby areas | 131 | 59 | 8,009 | 2.3% |
Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.
Check your address in Markham
The counts above cover the whole water system. To see whether your line is lead, look up your address on Markham's official inventory. Utilities had to make these public by October 16, 2024.
No map yet? Do the 2-minute scratch and magnet test.
Protect your drinking water
If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.
Choosing a lead-certified filter · Testing your water · Replacement cost
Nearby cities
- Hazel Crest1,396 lead + galv. lines
- Posen1,122 lead + galv. lines
- Harvey190 lead + galv. lines
- Midlothian568 lead + galv. lines
- Dixmoor24 lead + galv. lines
- East Hazel Crestno lead reported
- Country Club Hillsno lead reported
- Robbins1,332 lead + galv. lines
Check another water system
Questions
Does Markham, IL have lead pipes?
Yes. Markham, which serves Markham, reported 1,239 lead and 0 galvanized-requiring-replacement service lines, plus 149 of unknown material.
Who supplies water to Markham?
EPA's service area maps place most of Markham in Markham's service area (PWSID IL0311770). Harvey also serves parts of the city or nearby areas.
How do I check whether my Markham home has a lead service line?
Search your address on Markham's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.
When will lead pipes in Markham be replaced?
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Markham whether your street is scheduled and whether it covers the private side.