Public water system · IL1950300
ActiveLyndon
At a glance
Lyndon (PWSID IL1950300) is an active community water system in Whiteside County, Illinois. It reports serving 537 people through 248 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in August 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
537
Service connections
248
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Lyndon compare with other water systems in Whiteside County?
By EPA's size categories, Lyndon is a small system (501 to 3,300 people). Whiteside County has 59 active public water systems. Its population served is about 23% below the county average of 696 people per system, and accounts for 1.3% of the 41,082 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 Lyndon 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. 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 Lyndon?
EPA lists Lyndon 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 59 active systems in Whiteside County (14%) are also owned by a local government.
Does Lyndon have drinking water violations?
EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in August 2025. The violations listed here began between June 1977 and August 2025. By type: 6 monitoring and reporting, 2 contaminant level above the legal limit, 1 monitoring and 1 reporting. The contaminant or rule involved most often is Nitrate (4 of them). EPA lists 8 as resolved and 2 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 |
|---|---|---|---|---|
| 2025-08-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2025-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2016-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2013-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1984-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 1981-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Archived |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 10 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.
Lyndon: frequently asked questions
Who runs Lyndon?
Lyndon (PWSID IL1950300) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Lyndon serve?
Lyndon reports serving 537 people through 248 service connections in Whiteside County, Illinois.
Where does Lyndon 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 Lyndon have any drinking water violations?
EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in August 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 Lyndon'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 10 violations for this system; 2 are health-based, and the most recent began in August 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 Lyndon's water quality report?
As a community water system, Lyndon 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 Whiteside County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Il American-Sterling | Whiteside | 14,782 | Community | Groundwater |
| Rock Falls | Whiteside | 8,620 | Community | Groundwater |
| Morrison | Whiteside | 4,188 | Community | Groundwater |
| Fulton | Whiteside | 3,346 | Community | Groundwater |
| Prophetstown | Whiteside | 2,100 | Community | Groundwater |
| Erie | Whiteside | 1,479 | 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, “Lyndon, PWSID IL1950300, Illinois”, https://aquacensus.com/water-systems/illinois/lyndon-il1950300 (data as of October 1, 2026).