KNOLLS WATER COOPERATIVE
Illinois — Community Water System — PWSID: WI2300145
System Information
| PWSID | WI2300145 |
| System Name | KNOLLS WATER COOPERATIVE |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 05 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Jan 28, 1981 |
| Last Reported | Mar 2, 2026 |
Location & Contact
| State | Illinois |
| City | HINSDALE |
| ZIP Code | 60521 |
| Address | 917 CLEVELAND RD |
| Organization | SEITH, WILLIAM D - PRESIDENT |
| Phone | — |
Population & Service
| Population Served | 400 |
| Service Connections | 293 |
Drinking Water Violations (39)
This water system has 39 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2013 | — | MR | No | No | — | TT | — | Resolved | Jul 12, 2013 | — | |
| Jan 1, 2013 | — | MR | No | No | — | TT | — | Resolved | Jul 12, 2013 | — | |
| Jan 1, 2012 | — | MR | No | No | — | TT | — | Resolved | Aug 26, 2014 | — | |
| Jan 1, 2012 | — | MR | No | No | — | TT | — | Resolved | Aug 26, 2014 | — | |
| Jan 1, 2012 | — | MR | No | No | — | TT | — | Resolved | Aug 26, 2014 | — | |
| Jul 1, 2006 | Jul 31, 2006 | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2006 | — | |
| Jul 1, 2006 | Jul 31, 2006 | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2006 | — | |
| Jul 1, 2006 | Jul 31, 2006 | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2006 | — | |
| Jul 1, 2006 | Jul 31, 2006 | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2006 | — | |
| Jul 1, 2006 | Jul 31, 2006 | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2006 | — | |
| Jun 1, 2004 | Jun 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2004 | — | |
| Jun 1, 2004 | Jun 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2004 | — | |
| Jun 1, 2004 | Jun 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2004 | — | |
| Jun 1, 2004 | Jun 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2004 | — | |
| Oct 1, 2003 | Oct 31, 2003 | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2003 | — | |
| Oct 1, 2003 | Oct 31, 2003 | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2003 | — | |
| Oct 1, 2003 | Oct 31, 2003 | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2003 | — | |
| Oct 1, 2003 | Oct 31, 2003 | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2003 | — | |
| May 1, 2000 | May 31, 2000 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2000 | — | |
| May 1, 2000 | May 31, 2000 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2000 | — | |
| May 1, 2000 | May 31, 2000 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2000 | — | |
| May 1, 2000 | May 31, 2000 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2000 | — | |
| Sep 1, 1998 | Sep 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1998 | — | |
| Sep 1, 1998 | Sep 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1998 | — | |
| Sep 1, 1998 | Sep 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1998 | — | |
| Sep 1, 1998 | Sep 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1998 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.02 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.02 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.02 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.02 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Feb 28, 1994 | — | |
| Jan 1, 1994 | Mar 31, 1994 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Feb 28, 1994 | — | |
| — | — | — | No | No | — | — | — | — | — | — |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.