Public water system · IA4425032

Active

Hillsboro Water Works

At a glance

Hillsboro Water Works (PWSID IA4425032) is an active community water system in Henry County, Iowa. It reports serving 163 people through 130 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in August 2020.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

163

Service connections

130

Primary source

GWP

Purchased groundwater

System type

CWS

Community water system

System record

PWSIDIA4425032

System typeCommunity water system

Activity statusActive

Population served163

Service connections130

Primary water sourcePurchased groundwater

Owner typeLocal government

Primacy agencyIA state drinking water program

City servedHillsboro

StateIowa

ZIP—

CountyHenry County

How does Hillsboro Water Works compare with other water systems in Henry County?

By EPA's size categories, Hillsboro Water Works is a very small system (500 people or fewer). Henry County has 11 active public water systems. Its population served is well below the county average of 1,425 people per system, and accounts for 1% of the 15,676 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 Hillsboro Water Works 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 Hillsboro Water Works?

EPA lists Hillsboro Water Works 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. 10 of the 11 active systems in Henry County (91%) are also owned by a local government.

Does Hillsboro Water Works have drinking water violations?

EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in August 2020. The violations listed here began between November 1991 and August 2020. By type: 6 monitoring and reporting and 4 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 7 as resolved and 3 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
2020-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2020-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2018-03-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2017-10-01	Monitoring and reportingMonitoring, Regular · code 03	Nitritecode 1041	No	Resolved
2016-10-01	Monitoring and reportingMonitoring, Regular · code 03	Nitritecode 1041	No	Resolved
2005-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
1993-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1993-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1993-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Archived
1991-11-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved

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.

Hillsboro Water Works: frequently asked questions

Who runs Hillsboro Water Works?

Hillsboro Water Works (PWSID IA4425032) is a community water system owned by a local government. It is regulated by the IA state drinking water program.

How many people does Hillsboro Water Works serve?

Hillsboro Water Works reports serving 163 people through 130 service connections in Henry County, Iowa.

Where does Hillsboro Water Works 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 Hillsboro Water Works have any drinking water violations?

EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in August 2020. 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 Hillsboro Water Works' 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; 4 are health-based, and the most recent began in August 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.

Where can I find Hillsboro Water Works' water quality report?

As a community water system, Hillsboro Water Works 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 Henry County

Water system	County	Population served	Type	Source
Mount Pleasant Municipal Utilities	Henry	9,274	Community	Groundwater
New London Munic Water Dept	Henry	1,910	Community	Groundwater
Rathbun Regional Water (Mount Pleasant)	Henry	1,465	Community	Purchased surface water
Winfield Muni Water Dept	Henry	1,035	Community	Groundwater
Wayland Water Supply	Henry	966	Community	Groundwater
Salem Water Supply	Henry	396	Community	Purchased groundwater

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, “Hillsboro Water Works, PWSID IA4425032, Iowa”, https://aquacensus.com/water-systems/iowa/hillsboro-water-works-ia4425032 (data as of October 1, 2026).