MARKHAM EPA Drinking Water Compliance Record
TapScore summarizes EPA Safe Drinking Water Information System records for public water system IL0311770. It does not test household tap water or determine whether water is currently safe to drink.
Some recent records
TapScore compliance-history grade
8 EPA violation records from July 1, 2021 through June 30, 2026
System details
- PWSID
- IL0311770
- Population served
- 12,500
- Water source
- Surface Water
- Owner type
- Local Government
- State
- Illinois
- EPA region
- 5
- All historical records
- 37
- Not marked resolved
- 18
How to read this grade
Grade C means “Some recent records” under TapScore's published method. It is a comparison of recent EPA compliance records, not an EPA grade, laboratory result, health recommendation, or guarantee of present water quality.
EPA contaminant categories in violation records
| EPA category | Classification | Records |
|---|---|---|
| Coliform (TCR) | Health-based record | 19 |
| Total Trihalomethanes (TTHMs) | Monitoring/reporting record | 3 |
| Chlorine | Monitoring/reporting record | 3 |
| Consumer Confidence Rule | Monitoring/reporting record | 3 |
| Lead and Copper Rule | Monitoring/reporting record | 2 |
| Haloacetic Acids (HAA5) | Monitoring/reporting record | 2 |
| Public Notice | Monitoring/reporting record | 2 |
| Revised Total Coliform Rule | Monitoring/reporting record | 1 |
| LEAD AND COPPER RULE REVISIONS | Monitoring/reporting record | 1 |
These are compliance records associated with an EPA contaminant code, not current tap-water test results or proof that a substance is presently detected.
Violation history by year
Historical counts may include resolved records. For current notices and local sampling results, check the utility's latest Consumer Confidence Report and your state drinking-water agency.
Reported service area
Cities served
ZIP codes served
County: Cook