Public water system · IL1210600
ActiveWalnut Hill
At a glance
Walnut Hill (PWSID IL1210600) is an active community water system in Marion County, Illinois. It reports serving 1,180 people through 472 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,180
Service connections
472
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Walnut Hill compare with other water systems in Marion County?
By EPA's size categories, Walnut Hill is a small system (501 to 3,300 people). Marion County has 18 active public water systems. Its population served is about half of the county average of 2,372 people per system, and accounts for 2.8% of the 42,699 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 Walnut Hill 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 Walnut Hill?
EPA lists Walnut Hill 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. 11 of the 18 active systems in Marion County (61%) are also owned by a local government.
Does Walnut Hill have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2024. The violations listed here began between May 1995 and October 2024. By type: 3 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 as archived and 1 as resolved. 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. 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 |
|---|---|---|---|---|
| 2024-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 1999-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1995-05-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 3 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.
Walnut Hill: frequently asked questions
Who runs Walnut Hill?
Walnut Hill (PWSID IL1210600) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Walnut Hill serve?
Walnut Hill reports serving 1,180 people through 472 service connections in Marion County, Illinois.
Where does Walnut Hill 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 Walnut Hill have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2024. 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 Walnut Hill'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 3 violations for this system; none is health-based, and the most recent began in October 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Walnut Hill's water quality report?
As a community water system, Walnut Hill 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 Marion County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Centralia | Marion | 12,182 | Community | Surface water |
| Salem | Marion | 7,905 | Community | Surface water |
| Raccoon Water Company | Marion | 7,080 | Community | Purchased surface water |
| North East Marion County Water Cmpny | Marion | 3,220 | Community | Purchased surface water |
| Fmc Water Company | Marion | 2,945 | Community | Purchased surface water |
| Odin | Marion | 2,543 | 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, “Walnut Hill, PWSID IL1210600, Illinois”, https://aquacensus.com/water-systems/illinois/walnut-hill-il1210600 (data as of October 1, 2026).