Osco Mutual Water Supply Company, Inc.
Published drinking-water records and contacts for Osco Mutual Water Supply Company, Inc.. System IL0735200. Review sources and dates; not a real-time water assessment.
- System ID
- IL0735200
- State or territory
- IL
- Published population served
- 80
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 17 — 1994-01-01 – 2025-12-31
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.003 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0.0038 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0.0027 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2011-01-01 – 2013-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2010-07-01 – 2010-12-31 | 2026Q3 |
| Lead (PB90) | 0.0091 mg/L | 2008-01-01 – 2010-12-31 | 2026Q3 |
| Copper (CU90) | 1.405 mg/L | 2008-01-01 – 2010-12-31 | 2026Q3 |
Published compliance history
11 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Consumer Confidence Rule / Consumer Confidence Report Inadequate Reporting | 2025-07-01 – — | Unaddressed | No | 2026Q3 |
| Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR) | 2002-09-01 – 2002-09-30 | Archived | Yes | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Arsenic Rule / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 1983-11-02 – 1986-11-01 | Archived | No | 2026Q3 |
| Radionuclides and Revised Rad Rule / Monitoring, Regular | 1977-06-30 – 1981-06-29 | Archived | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
Administrative contact (EPA filing)
White, David: 309-945-2787
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.