Public water system · IA5221001
ActiveHills Water Supply
At a glance
Hills Water Supply (PWSID IA5221001) is an active community water system in Johnson County, Iowa. It reports serving 863 people through 365 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
863
Service connections
365
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hills Water Supply compare with other water systems in Johnson County?
By EPA's size categories, Hills Water Supply is a small system (501 to 3,300 people). Johnson County has 125 active public water systems. Its population served is about 38% below the county average of 1,384 people per system, and accounts for 0.5% 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 Hills 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. 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 Hills Water Supply?
EPA lists Hills 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 Hills Water Supply have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 2018. The violations listed here began between July 2017 and January 2018. By type: 2 monitoring and reporting. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 1 as unaddressed and 1 as resolved. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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 |
|---|---|---|---|---|
| 2018-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2017-07-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
All 2 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.
Hills Water Supply: frequently asked questions
Who runs Hills Water Supply?
Hills Water Supply (PWSID IA5221001) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Hills Water Supply serve?
Hills Water Supply reports serving 863 people through 365 service connections in Johnson County, Iowa.
Where does Hills 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 Hills Water Supply have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 2018. 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 Hills 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 2 violations for this system; none is health-based, and the most recent began in January 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Hills Water Supply's water quality report?
As a community water system, Hills 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 |
| North Liberty Water Supply | Johnson | 23,276 | Community | Groundwater |
| 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 |
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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, “Hills Water Supply, PWSID IA5221001, Iowa”, https://aquacensus.com/water-systems/iowa/hills-water-supply-ia5221001 (data as of October 1, 2026).