Public water system · WI1250091

Active

House on the Rock

At a glance

House on the Rock (PWSID WI1250091) is an active non-transient non-community water system in Iowa County, Wisconsin. It reports serving 2,025 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2020.

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

Population served

2,025

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDWI1250091

System typeNon-transient non-community water system

Activity statusActive

Population served2,025

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyWI state drinking water program

City servedSpring Green

StateWisconsin

ZIP—

CountyIowa County

How does House on the Rock compare with other water systems in Iowa County?

By EPA's size categories, House on the Rock is a small system (501 to 3,300 people). Iowa County has 78 active public water systems, and House on the Rock is the 3rd-largest of them by population served. Its population served is about 6.1 times the county average of 333 people per system, and accounts for 7.8% of the 25,964 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so House on the Rock is about 4.7 times that figure.

What does “non-transient non-community water system” mean?

A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Wisconsin has 891 active non-transient non-community water systems, 8.1% 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 House on the Rock?

EPA lists House on the Rock as privately owned. 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. 42 of the 78 active systems in Iowa County (54%) are also privately owned.

Does House on the Rock have drinking water violations?

Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2020. The violations listed here began between September 1997 and January 2020. By type: 9 monitoring and reporting, 1 monitoring, 1 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 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
2020-01-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2017-11-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2014-01-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2012-01-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2007-12-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2005-11-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2005-10-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2001-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1998-09-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-09-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	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.

House on the Rock: frequently asked questions

Who runs House on the Rock?

House on the Rock (PWSID WI1250091) is a non-transient non-community water system privately owned. It is regulated by the WI state drinking water program.

How many people does House on the Rock serve?

House on the Rock reports serving 2,025 people through 1 service connection in Iowa County, Wisconsin.

Where does House on the Rock 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 House on the Rock 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 January 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 House on the Rock'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. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2020. For current results, consult EPA ECHO, or the WI state drinking water program.

Where can I find House on the Rock's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. House on the Rock is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Iowa County

Water system	County	Population served	Type	Source
Dodgeville Waterworks	Iowa	4,583	Community	Groundwater
Mineral Point Waterworks	Iowa	2,487	Community	Groundwater
Barneveld Waterworks	Iowa	1,258	Community	Groundwater
Arena Waterworks	Iowa	877	Community	Groundwater
Highland Waterworks	Iowa	842	Community	Groundwater
American Players Theatre -Gateway	Iowa	821	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, “House on the Rock, PWSID WI1250091, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/house-on-the-rock-wi1250091 (data as of October 1, 2026).