Public water system · IL0311770
ActiveMarkham
Community water system in Cook County, Illinois, drawing primarily on purchased surface water.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
12,500
Service connections
4,138
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
Violations & enforcement
| Began | Violation | Contaminant | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | 4H | 5200 | No | Unaddressed |
| 2025-07-01 | 72 | 7000 | No | Unaddressed |
| 2025-07-01 | 27 | 2950 | No | Resolved |
| 2023-07-01 | 71 | 7000 | No | Resolved |
| 2023-06-15 | 75 | 7500 | No | Resolved |
| 2023-06-15 | 75 | 7500 | No | Resolved |
| 2022-05-01 | 3A | 8000 | No | Resolved |
| 2022-04-01 | 27 | 0999 | No | Resolved |
| 2020-12-30 | 66 | 5000 | No | Resolved |
| 2013-08-01 | 22 | 3100 | Yes | Resolved |
| 2013-07-01 | 27 | 0999 | No | Resolved |
| 2011-07-01 | 72 | 7000 | No | Resolved |
Markham: frequently asked questions
Is Markham's water safe to drink?
Markham is an active community water system regulated under the Safe Drinking Water Act, overseen by the IL state drinking water program. EPA SDWA violation and enforcement records for this system are being added to AquaCensus from EPA ECHO; consult EPA ECHO or your annual Consumer Confidence Report for its current compliance status.
Who runs Markham?
Markham (PWSID IL0311770) is a local government-owned community water system, regulated by the IL state drinking water program.
How many people does Markham serve?
Markham reports serving 12,500 people through 4,138 service connections in Cook County, Illinois.
Where does Markham get its water?
EPA SDWIS lists this system's primary water source as purchased surface water.
Other water systems in Cook County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Chicago | Cook | 2,746,388 | Community | Surface water |
| Cicero | Cook | 83,000 | Community | Purchased surface water |
| Schaumburg | Cook | 75,750 | Community | Purchased surface water |
| Evanston | Cook | 74,486 | Community | Surface water |
| Arlington Heights | Cook | 73,320 | Community | Purchased surface water |
| Palatine | Cook | 70,875 | Community | Purchased surface water |