Public water system · IL0250010
ActiveIola
At a glance
Iola (PWSID IL0250010) is an active community water system in Clay County, Illinois. It reports serving 158 people through 61 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in October 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
158
Service connections
61
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Iola compare with other water systems in Clay County?
By EPA's size categories, Iola is a very small system (500 people or fewer). Clay County has 8 active public water systems, and Iola is the 6th-largest of them by population served. Its population served is well below the county average of 1,270 people per system, and accounts for 1.6% of the 10,156 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 Iola is well below 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 Iola?
EPA lists Iola 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. 6 of the 8 active systems in Clay County (75%) are also owned by a local government.
Does Iola have drinking water violations?
EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in October 2019. The violations listed here began between August 1994 and October 2019. By type: 7 contaminant level above the legal limit and 4 monitoring and reporting. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (5 of them). EPA lists 9 as resolved and 2 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2012-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2005-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2005-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2005-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2005-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2005-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2005-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2004-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 1995-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1994-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 11 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.
Iola: frequently asked questions
Who runs Iola?
Iola (PWSID IL0250010) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Iola serve?
Iola reports serving 158 people through 61 service connections in Clay County, Illinois.
Where does Iola 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 Iola have any drinking water violations?
EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in October 2019. 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 Iola'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. EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in October 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Iola's water quality report?
As a community water system, Iola 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 Clay County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Flora | Clay | 5,233 | Community | Purchased surface water |
| Clay County Water Inc. | Clay | 2,015 | Community | Purchased surface water |
| Louisville | Clay | 1,201 | Community | Purchased surface water |
| Clay City | Clay | 957 | Community | Purchased groundwater |
| Xenia | Clay | 542 | Community | Purchased surface water |
| Priceless #447 | Clay | 25 | Transient non-community | Purchased groundwater |
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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, “Iola, PWSID IL0250010, Illinois”, https://aquacensus.com/water-systems/illinois/iola-il0250010 (data as of October 1, 2026).