Public water system · IA5252072
ActiveNorth Liberty Water Supply
At a glance
North Liberty Water Supply (PWSID IA5252072) is an active community water system in Johnson County, Iowa. It reports serving 23,276 people through 7,761 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2005.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
23,276
Service connections
7,761
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does North Liberty Water Supply compare with other water systems in Johnson County?
By EPA's size categories, North Liberty Water Supply is a large system (10,001 to 100,000 people). Johnson County has 125 active public water systems, and North Liberty Water Supply is the 3rd-largest of them by population served. Its population served is about 17 times the county average of 1,384 people per system, and accounts for 13% of the 172,955 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 North Liberty Water Supply is about 3.5 times 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,502 Iowa systems (82%) list groundwater as their primary source.
Who owns and regulates North Liberty Water Supply?
EPA lists North Liberty 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. 12 of the 125 active systems in Johnson County (9.6%) are also owned by a local government.
Does North Liberty Water Supply have drinking water violations?
EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2005. The violations listed here began between September 1991 and January 2005. By type: 6 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2005-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2001-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-05-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 1999-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1992-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1991-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 7 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.
North Liberty Water Supply: frequently asked questions
Who runs North Liberty Water Supply?
North Liberty Water Supply (PWSID IA5252072) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does North Liberty Water Supply serve?
North Liberty Water Supply reports serving 23,276 people through 7,761 service connections in Johnson County, Iowa.
Where does North Liberty Water Supply 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 North Liberty Water Supply have any drinking water violations?
EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2005. 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 North Liberty 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 7 violations for this system; 1 is health-based, and the most recent began in January 2005. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find North Liberty Water Supply's water quality report?
As a community water system, North Liberty 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 Johnson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Iowa City Water Department | Johnson | 68,753 | Community | Surface water |
| University Water System | Johnson | 26,684 | Community | Surface water |
| Coralville Muni Water System | Johnson | 22,318 | Community | Groundwater |
| Tiffin Water Supply | Johnson | 7,577 | Community | Groundwater |
| Solon Water Dept | Johnson | 3,018 | Community | Groundwater |
| Lone Tree Muni Water System | Johnson | 1,357 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “North Liberty Water Supply, PWSID IA5252072, Iowa”, https://aquacensus.com/water-systems/iowa/north-liberty-water-supply-ia5252072 (data as of October 1, 2026).