Public water system · IL0190450
ActiveMahomet
At a glance
Mahomet (PWSID IL0190450) is an active community water system in Champaign County, Illinois. It reports serving 6,580 people through 2,600 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in February 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
6,580
Service connections
2,600
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mahomet compare with other water systems in Champaign County?
By EPA's size categories, Mahomet is a medium system (3,301 to 10,000 people). Champaign County has 66 active public water systems, and Mahomet is the 4th-largest of them by population served. Its population served is about twice the county average of 3,158 people per system, and accounts for 3.2% of the 208,407 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 Mahomet is roughly in line with 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 Mahomet?
EPA lists Mahomet 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. 17 of the 66 active systems in Champaign County (26%) are also owned by a local government.
Does Mahomet have drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in February 2025. The violations listed here began between June 1977 and February 2025. By type: 4 monitoring and reporting, 2 public notice, recordkeeping or other, 1 monitoring, 1 contaminant level above the legal limit and 1 required treatment not met. The contaminant or rule involved most often is Consumer Confidence Rule (2 of them). EPA lists 6 as resolved and 3 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 |
|---|---|---|---|---|
| 2025-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-02-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2023-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2022-02-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2011-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2000-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1994-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1994-01-01 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 9 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.
Mahomet: frequently asked questions
Who runs Mahomet?
Mahomet (PWSID IL0190450) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Mahomet serve?
Mahomet reports serving 6,580 people through 2,600 service connections in Champaign County, Illinois.
Where does Mahomet 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 Mahomet have any drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in February 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 Mahomet'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 9 violations for this system; 2 are health-based, and the most recent began in February 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 Mahomet's water quality report?
As a community water system, Mahomet 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 Champaign County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Il American-Champaign | Champaign | 150,000 | Community | Groundwater |
| U of I-Champaign | Champaign | 13,000 | Community | Purchased groundwater |
| Rantoul | Champaign | 13,000 | Community | Groundwater |
| Sangamon Valley PWD | Champaign | 5,300 | Community | Groundwater |
| Il American-Tolono | Champaign | 3,604 | Community | Purchased groundwater |
| Il American-Fisher | Champaign | 2,026 | 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, “Mahomet, PWSID IL0190450, Illinois”, https://aquacensus.com/water-systems/illinois/mahomet-il0190450 (data as of October 1, 2026).