Public water system · IL1790350
ActiveMackinaw
At a glance
Mackinaw (PWSID IL1790350) is an active community water system in Tazewell County, Illinois. It reports serving 3,399 people through 1,345 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in July 2005.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,399
Service connections
1,345
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mackinaw compare with other water systems in Tazewell County?
By EPA's size categories, Mackinaw is a medium system (3,301 to 10,000 people). Tazewell County has 83 active public water systems. Its population served is about twice the county average of 1,557 people per system, and accounts for 2.6% of the 129,226 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 Mackinaw is about half of 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 Mackinaw?
EPA lists Mackinaw 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. 18 of the 83 active systems in Tazewell County (22%) are also owned by a local government.
Does Mackinaw have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in July 2005. The violations listed here began between June 1977 and July 2005. By type: 5 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 4 as archived and 2 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 |
|---|---|---|---|---|
| 2005-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2005-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1999-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1993-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | 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.
Mackinaw: frequently asked questions
Who runs Mackinaw?
Mackinaw (PWSID IL1790350) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Mackinaw serve?
Mackinaw reports serving 3,399 people through 1,345 service connections in Tazewell County, Illinois.
Where does Mackinaw 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 Mackinaw have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in July 2005. 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 Mackinaw'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 July 2005. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Mackinaw's water quality report?
As a community water system, Mackinaw 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 Tazewell County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Il American-Pekin | Tazewell | 31,731 | Community | Groundwater |
| East Peoria | Tazewell | 22,284 | Community | Groundwater |
| Morton | Tazewell | 17,111 | Community | Groundwater |
| Washington | Tazewell | 14,793 | Community | Groundwater |
| North Tazewell PWD | Tazewell | 7,625 | Community | Groundwater |
| Creve Coeur | Tazewell | 4,934 | Community | 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, “Mackinaw, PWSID IL1790350, Illinois”, https://aquacensus.com/water-systems/illinois/mackinaw-il1790350 (data as of October 1, 2026).