Public water system · IL0075275
ActiveOak Lawn MHP
At a glance
Oak Lawn MHP (PWSID IL0075275) is an active community water system in Boone County, Illinois. It reports serving 450 people through 180 service connections. Its primary water source is purchased groundwater, and EPA lists it as privately owned. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
450
Service connections
180
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Oak Lawn MHP compare with other water systems in Boone County?
By EPA's size categories, Oak Lawn MHP is a very small system (500 people or fewer). Boone County has 47 active public water systems. Its population served is about half of the county average of 939 people per system, and accounts for 1% of the 44,134 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 Oak Lawn MHP 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 groundwater means the system buys groundwater from another public water system rather than drawing its own. 348 Illinois systems (9%) list purchased groundwater as their primary source.
Who owns and regulates Oak Lawn MHP?
EPA lists Oak Lawn MHP as privately owned. 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. 34 of the 47 active systems in Boone County (72%) are also privately owned.
Does Oak Lawn MHP have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in November 2025. The violations listed here began between November 1995 and November 2025. By type: 4 monitoring and reporting, 1 monitoring and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2025-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2025-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2004-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2004-08-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1995-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 6 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.
Oak Lawn MHP: frequently asked questions
Who runs Oak Lawn MHP?
Oak Lawn MHP (PWSID IL0075275) is a community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Oak Lawn MHP serve?
Oak Lawn MHP reports serving 450 people through 180 service connections in Boone County, Illinois.
Where does Oak Lawn MHP get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Oak Lawn MHP have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in November 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 Oak Lawn MHP'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 6 violations for this system; 1 is health-based, and the most recent began in November 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 Oak Lawn MHP's water quality report?
As a community water system, Oak Lawn MHP 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 Boone County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Belvidere | Boone | 25,339 | Community | Groundwater |
| Aqua Illinois-Candlewick Dvn | Boone | 6,426 | Community | Groundwater |
| Poplar Grove | Boone | 2,372 | Community | Groundwater |
| Poplar Grove South | Boone | 1,877 | Community | Groundwater |
| Capron | Boone | 1,343 | Community | Groundwater |
| Poplar Grove West-Countryside | Boone | 790 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Oak Lawn MHP, PWSID IL0075275, Illinois”, https://aquacensus.com/water-systems/illinois/oak-lawn-mhp-il0075275 (data as of October 1, 2026).