MCHENRY, IL · McHenry County
MCHENRY Water System
Current status
1 item on record is open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.
This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Illinois’s official records. Always confirm current status with Illinois before making decisions based on this information.
System facts
- System ID (PWSID)
- IL1110600
- System type
- Community Water System
- Population served
- 22,335
- Service connections
- 8,484
- Ownership
- local government
- Water source
- groundwater (wells)
Violation history
Follow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
July 1, 2025
UnaddressedFollow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
October 1, 2023 – February 29, 2024
ResolvedMonitoring, Regular
—1,2-Dichloroethane
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Toluene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Ethylbenzene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Styrene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Vinyl chloride
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—1,2,4-Trichlorobenzene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—cis-1,2-Dichloroethylene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Xylenes, Total
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—DICHLOROMETHANE
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—o-Dichlorobenzene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—p-Dichlorobenzene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—1,1-Dichloroethylene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—trans-1,2-Dichloroethylene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—1,1,1-Trichloroethane
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Carbon tetrachloride
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—1,2-Dichloropropane
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Trichloroethylene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—1,1,2-Trichloroethane
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Tetrachloroethylene
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—CHLOROBENZENE
January 1, 2023 – December 31, 2023
ResolvedMonitoring, Regular
—Benzene
January 1, 2023 – December 31, 2023
ResolvedWater Quality Parameter M/R
—Lead and Copper Rule
April 1, 1997 – June 30, 1997
ResolvedWater Quality Parameter M/R
—Lead and Copper Rule
January 1, 1997 – March 31, 1997
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
Archived
Unaddressed no corrective action on record yetResolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| July 1, 2025 | Follow-up Or Routine LCR Tap M/R | Lead and Copper Rule | — | Unaddressed |
| October 1, 2023 – February 29, 2024 | Follow-up Or Routine LCR Tap M/R | Lead and Copper Rule | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | 1,2-Dichloroethane | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Toluene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Ethylbenzene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Styrene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Vinyl chloride | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | 1,2,4-Trichlorobenzene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | cis-1,2-Dichloroethylene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Xylenes, Total | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | DICHLOROMETHANE | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | o-Dichlorobenzene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | p-Dichlorobenzene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | 1,1-Dichloroethylene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | trans-1,2-Dichloroethylene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | 1,1,1-Trichloroethane | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Carbon tetrachloride | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | 1,2-Dichloropropane | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Trichloroethylene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | 1,1,2-Trichloroethane | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Tetrachloroethylene | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | CHLOROBENZENE | — | Resolved |
| January 1, 2023 – December 31, 2023 | Monitoring, Regular | Benzene | — | Resolved |
| April 1, 1997 – June 30, 1997 | Water Quality Parameter M/R | Lead and Copper Rule | — | Resolved |
| January 1, 1997 – March 31, 1997 | Water Quality Parameter M/R | Lead and Copper Rule | — | Resolved |
| June 30, 1977 – June 29, 1981 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Unaddressed no corrective action on record yetResolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- July 29, 2025State Public Notification requested1 linked violation
- July 29, 2025State Violation/Reminder Notice1 linked violation
- January 11, 2024State Violation/Reminder Notice1 linked violation
- January 11, 2024State Public Notification requested25 linked violations
- January 11, 2024State Public Notification requested4 linked violations
- November 6, 2023State Public Notification received1 linked violation
- October 11, 2023State Public Notification requested1 linked violation
- October 11, 2023State Violation/Reminder Notice1 linked violation
- April 9, 1998State Compliance achieved2 linked violations
- November 2, 1996State Public Notification requested1 linked violation
- November 2, 1996State Violation/Reminder Notice1 linked violation
- February 1, 1994State Compliance achieved1 linked violation
Contact
MCMAHON, JASON
847-417-0565
MCHENRY, IL 60050