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Non-Transient Non-Community Water System · PWS WI1571087

Don Larson Chevrolet Buick Gmc

Merrimac, Wisconsin 53561 - drinking water served from groundwater sources to 60 people, tracked in EPA SDWIS and UCMR5.

60
People served
101
EPA violations
13
Health-based
Untested
UCMR5 result

The verdict

EPA records 101 drinking-water violations at Don Larson Chevrolet Buick Gmc, 13% of them health-based - above the Wisconsin per-system average.

101
Total EPA violations on record
13%
Health-based (MCL / treatment failure)
60
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Don Larson Chevrolet Buick Gmc

Don Larson Chevrolet Buick Gmc is a private-owned non-transient non-community water system that delivers drinking water to 60 residents in Merrimac, Wisconsin (Sauk County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 101 total violations for this system , of which 13 (13%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 88 monitoring and reporting violations are on file. The most recent violation on record dates to 2011.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 8 violations (TT, health-based). 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, 51 of 202 UCMR5-tested systems have reported PFAS detections (25.2%).

Don Larson Chevrolet Buick Gmc's 101 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
60
Total Violations
101
Health-Based Violations
13
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
Sauk
School/Daycare
No
MCL Violations
5
Monitoring Violations
88
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule TT 8 2007
Coliform (TCR) MCL 5 2010
Lead and Copper Rule MR 4 2007
Toluene MR 4 2011
Styrene MR 4 2011
cis-1,2-Dichloroethylene MR 4 2011
Xylenes, Total MR 4 2011
DICHLOROMETHANE MR 4 2011
o-Dichlorobenzene MR 4 2011
p-Dichlorobenzene MR 4 2011
Vinyl chloride MR 4 2011
1,1,1-Trichloroethane MR 4 2011
Carbon tetrachloride MR 4 2011
1,2-Dichloropropane MR 4 2011
Trichloroethylene MR 4 2011
1,1,2-Trichloroethane MR 4 2011
CHLOROBENZENE MR 4 2011
Benzene MR 4 2011
1,1-Dichloroethylene MR 4 2011
1,2-Dichloroethane MR 4 2011
trans-1,2-Dichloroethylene MR 4 2011
1,2,4-Trichlorobenzene MR 4 2011
Ethylbenzene MR 4 2011
Tetrachloroethylene MR 4 2011

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 Don Larson Chevrolet Buick Gmc.

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 WI1571087 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 Don Larson Chevrolet Buick Gmc 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
2011 Toluene MR 4 SDWIS / WI1571087 / 2991
2011 Styrene MR 4 SDWIS / WI1571087 / 2996
2011 cis-1,2-Dichloroethylene MR 4 SDWIS / WI1571087 / 2380
2011 Xylenes, Total MR 4 SDWIS / WI1571087 / 2955
2011 DICHLOROMETHANE MR 4 SDWIS / WI1571087 / 2964
2011 o-Dichlorobenzene MR 4 SDWIS / WI1571087 / 2968
2011 p-Dichlorobenzene MR 4 SDWIS / WI1571087 / 2969
2011 Vinyl chloride MR 4 SDWIS / WI1571087 / 2976
2011 1,1,1-Trichloroethane MR 4 SDWIS / WI1571087 / 2981
2011 Carbon tetrachloride MR 4 SDWIS / WI1571087 / 2982
2011 1,2-Dichloropropane MR 4 SDWIS / WI1571087 / 2983
2011 Trichloroethylene MR 4 SDWIS / WI1571087 / 2984
2011 1,1,2-Trichloroethane MR 4 SDWIS / WI1571087 / 2985
2011 CHLOROBENZENE MR 4 SDWIS / WI1571087 / 2989
2011 Benzene MR 4 SDWIS / WI1571087 / 2990

How Don Larson Chevrolet Buick Gmc Compares

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

Metric Don Larson Chevrolet Buick Gmc Wisconsin avg Federal benchmark
Total violations 101 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 13 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 25.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 60 467 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 Don Larson Chevrolet Buick Gmc water safe to drink? ▼
Don Larson Chevrolet Buick Gmc (PWS ID: WI1571087) has 101 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 60 people using Groundwater sources.
How many people does Don Larson Chevrolet Buick Gmc serve? ▼
Don Larson Chevrolet Buick Gmc serves 60 people in Merrimac, Wisconsin. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does Don Larson Chevrolet Buick Gmc have? ▼
Don Larson Chevrolet Buick Gmc has 101 total violations: 13 health-based violations (MCL exceedances or treatment failures), 88 monitoring/reporting violations, and 8 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Don Larson Chevrolet Buick Gmc water? ▼
No PFAS testing data is available for Don Larson Chevrolet Buick Gmc under the EPA's UCMR5 monitoring program.
What water source does Don Larson Chevrolet Buick Gmc use? ▼
Don Larson Chevrolet Buick Gmc uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.