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SHAMROCK COLONY

PWS ID: SD4602267 · CARPENTER, South Dakota 57322

SHAMROCK COLONY serves 75 people in CARPENTER, South Dakota using Groundwater water sources. It has 231 recorded EPA violations, including 33 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SHAMROCK COLONY

SHAMROCK COLONY is a private-owned community water system that delivers drinking water to 75 residents in CARPENTER, South Dakota (Clark County) through 17 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 231 total violations for this system , of which 33 (14%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 188 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Fluoride, recorded in 31 violations (MCL, 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 South Dakota, EPA tracks 654 public water systems serving 915,901 people, with 56,254 cumulative violations and 8,399 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 86 violations. SHAMROCK COLONY's 231 violations sit above the South Dakota average. Statewide, 42 of 49 UCMR5-tested systems have reported PFAS detections (85.7%). 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
75
Total Violations
231
Health-Based Violations
33
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
17
County
Clark
School/Daycare
No
MCL Violations
31
Monitoring Violations
188
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Fluoride MCL 31 2012
Revised Total Coliform Rule MON 26 2025
Fluoride MR 17 2012
Gross Alpha, Excl. Radon and U MR 12 2010
Combined Uranium MR 12 2010
Combined Radium (-226 and -228) MR 12 2010
Coliform (TCR) MR 9 2012
Public Notice Other 7 2011
Consumer Confidence Rule Other 3 2025
Vinyl chloride MR 2 2009
DICHLOROMETHANE MR 2 2009
1,2,4-Trichlorobenzene MR 2 2009
1,1,2-Trichloroethane MR 2 2009
1,1-Dichloroethylene MR 2 2009
CHLOROBENZENE MR 2 2009
Styrene MR 2 2009
o-Dichlorobenzene MR 2 2009
Benzene MR 2 2009
p-Dichlorobenzene MR 2 2009
Toluene MR 2 2009
LASSO MR 2 2014
Heptachlor epoxide MR 2 2014
Atrazine MR 2 2014
Methoxychlor MR 2 2014
Di(2-ethylhexyl) phthalate MR 2 2014
Endrin MR 2 2014
Chlordane MR 2 2014
OXAMYL MR 2 2014
Dinoseb MR 2 2014
Pentachlorophenol MR 2 2014

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 SHAMROCK COLONY.

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 SD4602267 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

South Dakota Drinking Water Authority

South Dakota's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find SD regulator via EPA SDWIS

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
2025 Revised Total Coliform Rule MON 26 SDWIS / SD4602267 / 8000
2025 Consumer Confidence Rule Other 3 SDWIS / SD4602267 / 7000
2017 Groundwater Rule TT 2 SDWIS / SD4602267 / 0700
2014 LASSO MR 2 SDWIS / SD4602267 / 2051
2014 Heptachlor epoxide MR 2 SDWIS / SD4602267 / 2067
2014 Atrazine MR 2 SDWIS / SD4602267 / 2050
2014 Methoxychlor MR 2 SDWIS / SD4602267 / 2015
2014 Di(2-ethylhexyl) phthalate MR 2 SDWIS / SD4602267 / 2039
2014 Endrin MR 2 SDWIS / SD4602267 / 2005
2014 Chlordane MR 2 SDWIS / SD4602267 / 2959
2014 OXAMYL MR 2 SDWIS / SD4602267 / 2036
2014 Dinoseb MR 2 SDWIS / SD4602267 / 2041
2014 Pentachlorophenol MR 2 SDWIS / SD4602267 / 2326
2014 Endothall MR 2 SDWIS / SD4602267 / 2033
2014 Glyphosate MR 2 SDWIS / SD4602267 / 2034

How SHAMROCK COLONY Compares

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

Metric SHAMROCK COLONY South Dakota avg Federal benchmark
Total violations 231 86 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 33 12.8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 85.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 75 1,400 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 654 regulated public water systems in South Dakota.

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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is SHAMROCK COLONY water safe to drink? ▼
SHAMROCK COLONY (PWS ID: SD4602267) has 231 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 75 people using Groundwater sources.
How many people does SHAMROCK COLONY serve? ▼
SHAMROCK COLONY serves 75 people in CARPENTER, South Dakota. It is a Private-owned system using Groundwater water sources with 17 service connections.
What type of violations does SHAMROCK COLONY have? ▼
SHAMROCK COLONY has 231 total violations: 33 health-based violations (MCL exceedances or treatment failures), 188 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SHAMROCK COLONY water? ▼
No PFAS testing data is available for SHAMROCK COLONY under the EPA's UCMR5 monitoring program.
What water source does SHAMROCK COLONY use? ▼
SHAMROCK COLONY 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.

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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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial