Public water system · IL1990150
ActiveCarterville
At a glance
Carterville (PWSID IL1990150) is an active community water system in Williamson County, Illinois. It reports serving 6,528 people through 2,566 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
6,528
Service connections
2,566
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Carterville compare with other water systems in Williamson County?
By EPA's size categories, Carterville is a medium system (3,301 to 10,000 people). Williamson County has 25 active public water systems, and Carterville is the 4th-largest of them by population served. Its population served is about twice the county average of 3,018 people per system, and accounts for 8.7% of the 75,458 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 Carterville is roughly in line with 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 619 Illinois systems (16%) list purchased surface water as their primary source.
Who owns and regulates Carterville?
EPA lists Carterville 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. 20 of the 25 active systems in Williamson County (80%) are also owned by a local government.
Does Carterville have drinking water violations?
EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2025. The violations listed here began between June 1977 and April 2025. By type: 8 monitoring and reporting, 1 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (2 of them). EPA lists 9 as resolved and 1 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 |
|---|---|---|---|---|
| 2025-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2025-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2024-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2022-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloraminecode 1006 | No | Resolved |
| 2022-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-03-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2022-03-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2020-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-04-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 10 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.
Carterville: frequently asked questions
Who runs Carterville?
Carterville (PWSID IL1990150) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Carterville serve?
Carterville reports serving 6,528 people through 2,566 service connections in Williamson County, Illinois.
Where does Carterville get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Carterville have any drinking water violations?
EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2025. 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 Carterville'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 10 violations for this system; none is health-based, and the most recent began in April 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Carterville's water quality report?
As a community water system, Carterville 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 Williamson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Marion | Williamson | 16,855 | Community | Purchased surface water |
| Herrin | Williamson | 12,747 | Community | Purchased surface water |
| Lake of Egypt PWD | Williamson | 11,368 | Community | Surface water |
| Coal Valley PWD | Williamson | 4,023 | Community | Purchased surface water |
| Corinth PWD | Williamson | 3,927 | Community | Purchased surface water |
| Johnston City | Williamson | 3,509 | Community | Purchased surface water |
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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, “Carterville, PWSID IL1990150, Illinois”, https://aquacensus.com/water-systems/illinois/carterville-il1990150 (data as of October 1, 2026).