Public water system · IA6055077
ActiveLester Water Supply
At a glance
Lester Water Supply (PWSID IA6055077) is an active community water system in Lyon County, Iowa. It reports serving 296 people through 112 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 3 are health-based, and the most recent began in November 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
296
Service connections
112
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Lester Water Supply compare with other water systems in Lyon County?
By EPA's size categories, Lester Water Supply is a very small system (500 people or fewer). Lyon County has 12 active public water systems. Its population served is well below the county average of 1,016 people per system, and accounts for 2.4% of the 12,196 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active community water system reports serving 6,703 people, so Lester Water Supply 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. Iowa has 1,084 active community water systems, 59% of the state's 1,828 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 156 Iowa systems (8.5%) list purchased groundwater as their primary source.
Who owns and regulates Lester Water Supply?
EPA lists Lester Water Supply as owned by a local government. The IA 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 12 active systems in Lyon County (67%) are also owned by a local government.
Does Lester Water Supply have drinking water violations?
EPA's records list 11 violations for this system; 3 are health-based, and the most recent began in November 2017. The violations listed here began between September 1979 and November 2017. By type: 6 monitoring and reporting, 3 contaminant level above the legal limit and 2 monitoring. The contaminant or rule involved most often is Combined Uranium (3 of them). EPA lists 10 as resolved 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. 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 |
|---|---|---|---|---|
| 2017-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2009-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2004-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2003-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2003-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 1995-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | No | Resolved |
| 1995-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1994-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 1994-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1979-09-05 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | 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.
Lester Water Supply: frequently asked questions
Who runs Lester Water Supply?
Lester Water Supply (PWSID IA6055077) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Lester Water Supply serve?
Lester Water Supply reports serving 296 people through 112 service connections in Lyon County, Iowa.
Where does Lester Water Supply get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Lester Water Supply have any drinking water violations?
EPA's records list 11 violations for this system; 3 are health-based, and the most recent began in November 2017. 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 Lester Water Supply'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 11 violations for this system; 3 are health-based, and the most recent began in November 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Lester Water Supply's water quality report?
As a community water system, Lester Water Supply 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 Lyon County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Rock Rapids Municipal Water Works | Lyon | 2,611 | Community | Groundwater |
| Lyon-Sioux Rws-Doon | Lyon | 1,765 | Community | Groundwater |
| Lyon-Sioux Rws-Big Sioux | Lyon | 1,530 | Community | Groundwater |
| Lyon-Sioux Rws-Rock Rapids | Lyon | 1,187 | Community | Purchased groundwater |
| George Water Supply | Lyon | 1,082 | Community | Groundwater |
| Inwood Water Supply | Lyon | 928 | Community | Purchased 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, “Lester Water Supply, PWSID IA6055077, Iowa”, https://aquacensus.com/water-systems/iowa/lester-water-supply-ia6055077 (data as of October 1, 2026).