Public water system · IL0310230
ActiveMid-Mark Water Commission
At a glance
Mid-Mark Water Commission (PWSID IL0310230) is an active community water system in Cook County, Illinois. It reports serving 25 people through 2 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
2
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Mid-Mark Water Commission compare with other water systems in Cook County?
By EPA's size categories, Mid-Mark Water Commission is a very small system (500 people or fewer). Cook County has 251 active public water systems. Its population served is well below the county average of 20,993 people per system, and accounts for less than 0.1% of the 5,269,212 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 Mid-Mark Water Commission 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 Mid-Mark Water Commission?
EPA lists Mid-Mark Water Commission 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. 134 of the 251 active systems in Cook County (53%) are also owned by a local government.
Does Mid-Mark Water Commission have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Mid-Mark Water Commission. For the latest compliance status, check EPA ECHO for current compliance history.
Mid-Mark Water Commission: frequently asked questions
Who runs Mid-Mark Water Commission?
Mid-Mark Water Commission (PWSID IL0310230) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Mid-Mark Water Commission serve?
Mid-Mark Water Commission reports serving 25 people through 2 service connections in Cook County, Illinois.
Where does Mid-Mark Water Commission 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 Mid-Mark Water Commission have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Mid-Mark Water Commission'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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Mid-Mark Water Commission's water quality report?
As a community water system, Mid-Mark Water Commission 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 Cook County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Chicago | Cook | 2,721,308 | Community | Surface water |
| Cicero | Cook | 83,000 | Community | Purchased surface water |
| Schaumburg | Cook | 75,750 | Community | Purchased surface water |
| Evanston | Cook | 74,486 | Community | Surface water |
| Arlington Heights | Cook | 73,320 | Community | Purchased surface water |
| Palatine | Cook | 70,875 | 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, “Mid-Mark Water Commission, PWSID IL0310230, Illinois”, https://aquacensus.com/water-systems/illinois/mid-mark-water-commission-il0310230 (data as of October 1, 2026).