Public water system · IL1350450
ActiveNokomis
At a glance
Nokomis (PWSID IL1350450) is an active community water system in Montgomery County, Illinois. It reports serving 2,370 people through 1,183 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,370
Service connections
1,183
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Nokomis compare with other water systems in Montgomery County?
By EPA's size categories, Nokomis is a small system (501 to 3,300 people). Montgomery County has 24 active public water systems, and Nokomis is the 3rd-largest of them by population served. Its population served is about twice the county average of 1,170 people per system, and accounts for 8.4% of the 28,090 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 Nokomis is about 65% 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 Nokomis?
EPA lists Nokomis 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. 16 of the 24 active systems in Montgomery County (67%) are also owned by a local government.
Does Nokomis have drinking water violations?
EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in January 2026. The violations listed here began between June 1977 and January 2026. By type: 7 contaminant level above the legal limit, 3 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Trichloroethylene (7 of them). EPA lists 9 as resolved, 1 as unaddressed 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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 |
|---|---|---|---|---|
| 2026-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2019-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2009-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1996-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Trichloroethylenecode 2984 | Yes | Resolved |
| 1996-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Trichloroethylenecode 2984 | Yes | Resolved |
| 1996-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Trichloroethylenecode 2984 | Yes | Resolved |
| 1996-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Trichloroethylenecode 2984 | Yes | Resolved |
| 1995-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Trichloroethylenecode 2984 | Yes | Resolved |
| 1995-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Trichloroethylenecode 2984 | Yes | Resolved |
| 1995-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Trichloroethylenecode 2984 | Yes | Resolved |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 11 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.
Nokomis: frequently asked questions
Who runs Nokomis?
Nokomis (PWSID IL1350450) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Nokomis serve?
Nokomis reports serving 2,370 people through 1,183 service connections in Montgomery County, Illinois.
Where does Nokomis 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 Nokomis have any drinking water violations?
EPA's records list 11 violations for this system; 7 are health-based, and the most recent began in January 2026. 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 Nokomis' 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 11 violations for this system; 7 are health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Nokomis' water quality report?
As a community water system, Nokomis 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 Montgomery County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Litchfield | Montgomery | 6,648 | Community | Surface water |
| Hillsboro | Montgomery | 4,402 | Community | Surface water |
| Graham Correctional Site | Montgomery | 2,155 | Community | Purchased surface water |
| Ej Water-Mcwc | Montgomery | 2,075 | Community | Purchased surface water |
| Henderson PWD | Montgomery | 2,045 | Community | Purchased surface water |
| Suburban Hospital | Montgomery | 1,900 | Non-transient non-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, “Nokomis, PWSID IL1350450, Illinois”, https://aquacensus.com/water-systems/illinois/nokomis-il1350450 (data as of October 1, 2026).