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Community Water System · PWS WI1250318

House on the Rock Resort

Spring Green, Wisconsin 53588 - drinking water served from groundwater sources to 470 people, tracked in EPA SDWIS and UCMR5.

470
People served
85
EPA violations
17
Health-based
Untested
UCMR5 result

The verdict

EPA records 85 drinking-water violations at House on the Rock Resort, 20% of them health-based - above the Wisconsin per-system average.

85
Total EPA violations on record
20%
Health-based (MCL / treatment failure)
470
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: House on the Rock Resort

House on the Rock Resort is a private-owned community water system that delivers drinking water to 470 residents in Spring Green, Wisconsin (Iowa County) through 55 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 85 total violations for this system , of which 17 (20%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 54 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 32 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

House on the Rock Resort's 85 violations sit above the Wisconsin average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
470
Total Violations
85
Health-Based Violations
17
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
55
County
Iowa
School/Daycare
No
MCL Violations
15
Monitoring Violations
54
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 32 2019
Coliform (TCR) MCL 15 2007
Public Notice Other 10 2017
Coliform (TCR) MR 8 1998
Nitrate MR 6 1996
Revised Total Coliform Rule RPT 4 2020
Revised Total Coliform Rule MON 4 2021
E. COLI MR 4 2019
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 2 2024

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for House on the Rock Resort.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID WI1250318 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Wisconsin Drinking Water Authority

Wisconsin DNR, Drinking Water and Groundwater is the primacy agency that licenses and inspects House on the Rock Resort under EPA-delegated authority.

Open WI regulator portal

Source: Wisconsin DNR, Drinking Water and Groundwater

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 2 SDWIS / WI1250318 / 0400
2021 Revised Total Coliform Rule MON 4 SDWIS / WI1250318 / 8000
2020 Revised Total Coliform Rule RPT 4 SDWIS / WI1250318 / 8000
2019 Lead and Copper Rule MR 32 SDWIS / WI1250318 / 5000
2019 E. COLI MR 4 SDWIS / WI1250318 / 3014
2017 Public Notice Other 10 SDWIS / WI1250318 / 7500
2007 Coliform (TCR) MCL 15 SDWIS / WI1250318 / 3100
1998 Coliform (TCR) MR 8 SDWIS / WI1250318 / 3100
1996 Nitrate MR 6 SDWIS / WI1250318 / 1040

How House on the Rock Resort Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric House on the Rock Resort Wisconsin avg Federal benchmark
Total violations 85 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 17 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 38.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 470 467 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,988 regulated public water systems in Wisconsin.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is House on the Rock Resort water safe to drink? ▼
House on the Rock Resort (PWS ID: WI1250318) has 85 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 470 people using Groundwater sources.
How many people does House on the Rock Resort serve? ▼
House on the Rock Resort serves 470 people in Spring Green, Wisconsin. It is a Private-owned system using Groundwater water sources with 55 service connections.
What type of violations does House on the Rock Resort have? ▼
House on the Rock Resort has 85 total violations: 17 health-based violations (MCL exceedances or treatment failures), 54 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in House on the Rock Resort water? ▼
No PFAS testing data is available for House on the Rock Resort under the EPA's UCMR5 monitoring program.
What water source does House on the Rock Resort use? ▼
House on the Rock Resort uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.