Public water system · IL0650150
ActiveDahlgren
At a glance
Dahlgren (PWSID IL0650150) is an active community water system in Hamilton County, Illinois. It reports serving 859 people through 373 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
859
Service connections
373
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Dahlgren compare with other water systems in Hamilton County?
By EPA's size categories, Dahlgren is a small system (501 to 3,300 people). Hamilton County has 4 active public water systems, and Dahlgren is the 3rd-largest of them by population served. Its population served is about 56% below the county average of 1,966 people per system, and accounts for 11% of the 7,864 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 Dahlgren 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. 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 Dahlgren?
EPA lists Dahlgren 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. 4 of the 4 active systems in Hamilton County (100%) are also owned by a local government.
Does Dahlgren have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2023. By type: 1 monitoring and reporting. The contaminant or rule involved is Haloacetic acids (HAA5). EPA lists 1 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 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
The one violation in EPA's records.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.
Dahlgren: frequently asked questions
Who runs Dahlgren?
Dahlgren (PWSID IL0650150) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Dahlgren serve?
Dahlgren reports serving 859 people through 373 service connections in Hamilton County, Illinois.
Where does Dahlgren 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 Dahlgren have any drinking water violations?
EPA's records list one violation for this system; it is not 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 Dahlgren'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 one violation for this system; it is not 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 Dahlgren's water quality report?
As a community water system, Dahlgren 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 Hamilton County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hamilton County Water District | Hamilton | 3,958 | Community | Purchased surface water |
| Mcleansboro | Hamilton | 2,812 | Community | Purchased surface water |
| Broughton Water District | Hamilton | 235 | 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, “Dahlgren, PWSID IL0650150, Illinois”, https://aquacensus.com/water-systems/illinois/dahlgren-il0650150 (data as of October 1, 2026).