Public water system · IL0810350
ActiveNason
At a glance
Nason (PWSID IL0810350) is an active community water system in Jefferson County, Illinois. It reports serving 207 people through 122 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2012.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
207
Service connections
122
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Nason compare with other water systems in Jefferson County?
By EPA's size categories, Nason is a very small system (500 people or fewer). Jefferson County has 14 active public water systems. Its population served is well below the county average of 2,544 people per system, and accounts for 0.6% of the 35,609 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 Nason 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 Nason?
EPA lists Nason 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. 8 of the 14 active systems in Jefferson County (57%) are also owned by a local government.
Does Nason have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2012. The violations listed here began between April 2009 and January 2012. By type: 2 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Chloramine (2 of them). EPA lists 3 as resolved. 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 |
|---|---|---|---|---|
| 2012-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloraminecode 1006 | No | Resolved |
| 2010-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2009-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloraminecode 1006 | No | Resolved |
All 3 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.
Nason: frequently asked questions
Who runs Nason?
Nason (PWSID IL0810350) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Nason serve?
Nason reports serving 207 people through 122 service connections in Jefferson County, Illinois.
Where does Nason 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 Nason have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2012. 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 Nason'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 3 violations for this system; none is health-based, and the most recent began in January 2012. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Nason's water quality report?
As a community water system, Nason 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 Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Mount Vernon | Jefferson | 15,793 | Community | Purchased surface water |
| Northeast Mount Vernon Water Company | Jefferson | 5,483 | Community | Purchased surface water |
| Woodlawn | Jefferson | 3,587 | Community | Purchased surface water |
| Dix-Kell Water Commssion | Jefferson | 1,972 | Community | Purchased surface water |
| Belle Rive | Jefferson | 1,930 | Community | Purchased surface water |
| Waltonville | Jefferson | 1,901 | 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, “Nason, PWSID IL0810350, Illinois”, https://aquacensus.com/water-systems/illinois/nason-il0810350 (data as of October 1, 2026).