RIO
Illinois - Community Water System - PWSID: IL0950450
System Information
| PWSID | IL0950450 |
| System Name | RIO |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 05 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1981 |
| Last Reported | Feb 26, 2026 |
Location & Contact
| State | Illinois |
| City | RIO |
| ZIP Code | 61472 |
| Address | 262 -340TH STREET |
| Organization | SHULL, BOB L. |
| Phone | 309-373-9858 |
Population & Service
| Population Served | 265 |
| Service Connections | 106 |
Drinking Water Violations (165)
This water system has 165 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov 1, 2008 | Nov 30, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2008 | - | |
| Nov 1, 2008 | Nov 30, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2008 | - | |
| Nov 1, 2008 | Nov 30, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2008 | - | |
| Nov 1, 2008 | Nov 30, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2008 | - | |
| Oct 1, 1995 | - | MR | No | No | - | TT | - | Resolved | Jan 27, 1997 | - | |
| Sep 1, 1995 | Sep 30, 1995 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1995 | - | |
| Sep 1, 1995 | Sep 30, 1995 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1995 | - | |
| Jul 1, 1994 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 1994 | - | |
| Jun 1, 1994 | Jun 30, 1994 | MR | No | No | - | 5% of samples | - | Archived | Jun 30, 1994 | - | |
| Jun 1, 1994 | Jun 30, 1994 | MR | No | No | - | 5% of samples | - | Archived | Jun 30, 1994 | - | |
| Jun 1, 1994 | Jun 30, 1994 | MR | No | No | - | 5% of samples | - | Archived | Jun 30, 1994 | - | |
| Jun 1, 1994 | Jun 30, 1994 | MR | No | No | - | 5% of samples | - | Archived | Jun 30, 1994 | - | |
| Jun 1, 1994 | Jun 30, 1994 | MR | No | No | - | 5% of samples | - | Archived | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.7 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 1 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 1 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 1 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.7 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.7 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.07 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.075 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.075 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.6 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.07 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.07 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.075 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.07 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.07 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.6 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.6 mg/L | - | Resolved | Jun 30, 1994 | - | |
| Apr 1, 1994 | Jun 30, 1994 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Jun 30, 1994 | - |
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.