Public water system · WI2670110
ActiveHartford Waterworks
At a glance
Hartford Waterworks (PWSID WI2670110) is an active community water system in Washington County, Wisconsin. It reports serving 15,805 people through 5,853 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 2005.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
15,805
Service connections
5,853
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hartford Waterworks compare with other water systems in Washington County?
By EPA's size categories, Hartford Waterworks is a large system (10,001 to 100,000 people). Washington County has 268 active public water systems, and Hartford Waterworks is the 3rd-largest of them by population served. Its population served is about 32 times the county average of 496 people per system, and accounts for 12% of the 132,959 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active community water system reports serving 6,703 people, so Hartford Waterworks is about 136% above 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. Wisconsin has 1,053 active community water systems, 9.5% of the state's 11,056 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,978 Wisconsin systems (99%) list groundwater as their primary source.
Who owns and regulates Hartford Waterworks?
EPA lists Hartford Waterworks as owned by a local government. The WI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 38 of the 268 active systems in Washington County (14%) are also owned by a local government.
Does Hartford Waterworks have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 2005. The violations listed here began between January 1995 and July 2005. By type: 10 monitoring and reporting, 1 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Nitrate (3 of them). EPA lists 12 as resolved. 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 |
|---|---|---|---|---|
| 2005-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 2002-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2000-05-02 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2000-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1999-07-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzenecode 2990 | No | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloropropanecode 2983 | No | Resolved |
The 12 most recent 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.
Hartford Waterworks: frequently asked questions
Who runs Hartford Waterworks?
Hartford Waterworks (PWSID WI2670110) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Hartford Waterworks serve?
Hartford Waterworks reports serving 15,805 people through 5,853 service connections in Washington County, Wisconsin.
Where does Hartford Waterworks 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 Hartford Waterworks have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 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 Hartford Waterworks' 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. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 2005. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Hartford Waterworks' water quality report?
As a community water system, Hartford Waterworks 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 Washington County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| West Bend Waterworks | Washington | 31,752 | Community | Groundwater |
| Germantown Water Utility | Washington | 20,027 | Community | Groundwater |
| Jackson Waterworks | Washington | 7,844 | Community | Groundwater |
| Slinger Water Utility | Washington | 5,659 | Community | Groundwater |
| Kewaskum Waterworks | Washington | 4,309 | Community | Groundwater |
| Cabelas - Richfield | Washington | 3,931 | Non-transient non-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, “Hartford Waterworks, PWSID WI2670110, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/hartford-waterworks-wi2670110 (data as of October 1, 2026).