Public water system · IL1170150

Active

Carlinville

At a glance

Carlinville (PWSID IL1170150) is an active community water system in Macoupin County, Illinois. It reports serving 6,598 people through 2,880 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2023.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

6,598

Service connections

2,880

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDIL1170150

System typeCommunity water system

Activity statusActive

Population served6,598

Service connections2,880

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedCarlinville

StateIllinois

ZIP—

CountyMacoupin County

How does Carlinville compare with other water systems in Macoupin County?

By EPA's size categories, Carlinville is a medium system (3,301 to 10,000 people). Macoupin County has 32 active public water systems, and Carlinville is the largest of them by population served. Its population served is about 4.7 times the county average of 1,411 people per system, and accounts for 15% of the 45,161 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 Carlinville 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 89 Illinois systems (2.3%) list surface water as their primary source.

Who owns and regulates Carlinville?

EPA lists Carlinville 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. 28 of the 32 active systems in Macoupin County (88%) are also owned by a local government.

Does Carlinville have drinking water violations?

Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2023. The violations listed here began between April 2011 and April 2023. By type: 8 required treatment not met, 2 monitoring and reporting, 1 contaminant level above the legal limit and 1 disinfectant level above the legal limit. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (4 of them). 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
2023-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chloritecode 1009	No	Resolved
2015-08-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2015-07-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2015-05-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2015-05-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2014-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chloritecode 1009	No	Resolved
2014-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Chloritecode 1009	Yes	Resolved
2012-01-01	Required treatment not metTreatment Technique Precursor Removal · code 46	Carbon, totalcode 2920	Yes	Resolved
2011-10-01	Required treatment not metTreatment Technique Precursor Removal · code 46	Carbon, totalcode 2920	Yes	Resolved
2011-07-01	Required treatment not metTreatment Technique Precursor Removal · code 46	Carbon, totalcode 2920	Yes	Resolved
2011-06-01	Disinfectant level above the legal limitNon-Acute MRDL · code 11	Chlorine dioxidecode 1008	Yes	Resolved
2011-04-01	Required treatment not metTreatment Technique Precursor Removal · code 46	Carbon, totalcode 2920	Yes	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.

Carlinville: frequently asked questions

Who runs Carlinville?

Carlinville (PWSID IL1170150) is a community water system owned by a local government. It is regulated by the IL state drinking water program.

How many people does Carlinville serve?

Carlinville reports serving 6,598 people through 2,880 service connections in Macoupin County, Illinois.

Where does Carlinville get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does Carlinville have any drinking water violations?

Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2023. 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 Carlinville'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, 10 are health-based, and the most recent began in April 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.

Where can I find Carlinville's water quality report?

As a community water system, Carlinville 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 Macoupin County

Water system	County	Population served	Type	Source
Staunton	Macoupin	5,756	Community	Surface water
Brighton	Macoupin	5,041	Community	Purchased surface water
Gillespie	Macoupin	3,737	Community	Surface water
Virden	Macoupin	3,274	Community	Purchased surface water
Mount Olive	Macoupin	2,193	Community	Purchased surface water
Girard	Macoupin	1,885	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, “Carlinville, PWSID IL1170150, Illinois”, https://aquacensus.com/water-systems/illinois/carlinville-il1170150 (data as of October 1, 2026).