Public water system · IL0630550
ActiveMinooka
At a glance
Minooka (PWSID IL0630550) is an active community water system in Grundy County, Illinois. It reports serving 12,800 people through 4,190 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2016.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
12,800
Service connections
4,190
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Minooka compare with other water systems in Grundy County?
By EPA's size categories, Minooka is a large system (10,001 to 100,000 people). Grundy County has 51 active public water systems, and Minooka is the 2nd-largest of them by population served. Its population served is about 13 times the county average of 1,002 people per system, and accounts for 25% of the 51,074 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active community water system reports serving 6,703 people, so Minooka is about twice that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Illinois has 1,773 active community water systems, 46% of the state's 3,872 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,808 Illinois systems (73%) list groundwater as their primary source.
Who owns and regulates Minooka?
EPA lists Minooka as owned by a local government. The IL state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 12 of the 51 active systems in Grundy County (24%) are also owned by a local government.
Does Minooka have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2016. The violations listed here began between January 2008 and June 2016. By type: 11 monitoring and reporting and 1 contaminant level above the legal limit. The contaminants or rules involved are Revised Total Coliform Rule, Total coliform bacteria (TCR), Chlorine and Total trihalomethanes (TTHM). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2016-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2014-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2014-03-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-03-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dibromo-3-chloropropane (DBCP)code 2931 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlordanecode 2959 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlor epoxidecode 2067 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Pentachlorophenolcode 2326 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Aldicarb sulfonecode 2044 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Minooka: frequently asked questions
Who runs Minooka?
Minooka (PWSID IL0630550) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Minooka serve?
Minooka reports serving 12,800 people through 4,190 service connections in Grundy County, Illinois.
Where does Minooka get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Minooka have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2016. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Minooka's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in June 2016. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Minooka's water quality report?
As a community water system, Minooka must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Grundy County
Related pages
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Minooka, PWSID IL0630550, Illinois”, https://aquacensus.com/water-systems/illinois/minooka-il0630550 (data as of October 1, 2026).