Public water system · IL1315150
ActiveM C L W System, Inc..
At a glance
M C L W System, Inc.. (PWSID IL1315150) is an active community water system in Mercer County, Illinois. It reports serving 98 people through 32 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in May 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
98
Service connections
32
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does M C L W System, Inc.. compare with other water systems in Mercer County?
By EPA's size categories, M C L W System, Inc.. is a very small system (500 people or fewer). Mercer County has 27 active public water systems. Its population served is well below the county average of 426 people per system, and accounts for 0.9% of the 11,499 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 M C L W System, Inc.. 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,808 Illinois systems (73%) list groundwater as their primary source.
Who owns and regulates M C L W System, Inc..?
EPA lists M C L W System, Inc.. 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. 17 of the 27 active systems in Mercer County (63%) are also privately owned.
Does M C L W System, Inc.. have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in May 2015. The violations listed here began between January 2002 and May 2015. By type: 12 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 11 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 |
|---|---|---|---|---|
| 2015-05-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2004-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2004-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Thalliumcode 1085 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cyanidecode 1024 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | 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.
M C L W System, Inc..: frequently asked questions
Who runs M C L W System, Inc..?
M C L W System, Inc.. (PWSID IL1315150) is a community water system privately owned. It is regulated by the IL state drinking water program.
How many people does M C L W System, Inc.. serve?
M C L W System, Inc.. reports serving 98 people through 32 service connections in Mercer County, Illinois.
Where does M C L W System, Inc.. get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does M C L W System, Inc.. have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in May 2015. 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 M C L W System, Inc..'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, none is health-based, and the most recent began in May 2015. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find M C L W System, Inc..'s water quality report?
As a community water system, M C L W System, Inc.. 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 Mercer County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Aledo | Mercer | 3,470 | Community | Groundwater |
| Viola | Mercer | 970 | Community | Groundwater |
| Sherrard | Mercer | 785 | Community | Groundwater |
| Fyre Lake Water Company | Mercer | 760 | Community | Groundwater |
| Keithsburg | Mercer | 747 | Community | Groundwater |
| New Windsor | Mercer | 740 | 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, “M C L W System, Inc.., PWSID IL1315150, Illinois”, https://aquacensus.com/water-systems/illinois/m-c-l-w-system-inc-il1315150 (data as of October 1, 2026).