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WOONSOCKET

PWS ID: SD4600376 · WOONSOCKET, South Dakota 57385

WOONSOCKET serves 618 people in WOONSOCKET, South Dakota using Groundwater water sources. It has 147 recorded EPA violations, including 13 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: WOONSOCKET

WOONSOCKET is a local-owned community water system that delivers drinking water to 618 residents in WOONSOCKET, South Dakota (Sanborn County) through 330 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 147 total violations for this system , of which 13 (9%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 124 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 Coliform (TCR), recorded in 7 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 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. WOONSOCKET's 147 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
618
Total Violations
147
Health-Based Violations
13
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
330
County
Sanborn
School/Daycare
No
MCL Violations
3
Monitoring Violations
124
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 7 1999
Lead and Copper Rule TT 6 2011
Vinyl chloride MR 5 2009
Ethylbenzene MR 5 2009
1,2,4-Trichlorobenzene MR 5 2009
1,1-Dichloroethylene MR 5 2009
Carbon tetrachloride MR 5 2009
o-Dichlorobenzene MR 5 2009
trans-1,2-Dichloroethylene MR 5 2009
p-Dichlorobenzene MR 5 2009
1,2-Dichloroethane MR 5 2009
Trichloroethylene MR 5 2009
Toluene MR 5 2009
DICHLOROMETHANE MR 5 2009
Xylenes, Total MR 5 2009
CHLOROBENZENE MR 5 2009
Styrene MR 5 2009
Benzene MR 5 2009
1,2-Dichloropropane MR 5 2009
Tetrachloroethylene MR 5 2009
cis-1,2-Dichloroethylene MR 5 2009
1,1,2-Trichloroethane MR 5 2009
1,1,1-Trichloroethane MR 5 2009
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 4 2014
Coliform (TCR) MCL 3 2013
Chlorine MR 3 2015
Consumer Confidence Rule Other 2 2001
Total Haloacetic Acids (HAA5) MR 2 2009
TTHM MR 2 2009
Nitrate MR 2 1993

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 WOONSOCKET.

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 SD4600376 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
2024 E. COLI MR 1 SDWIS / SD4600376 / 3014
2015 Chlorine MR 3 SDWIS / SD4600376 / 0999
2014 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 4 SDWIS / SD4600376 / 0400
2013 Coliform (TCR) MCL 3 SDWIS / SD4600376 / 3100
2011 Lead and Copper Rule TT 6 SDWIS / SD4600376 / 5000
2009 Vinyl chloride MR 5 SDWIS / SD4600376 / 2976
2009 Ethylbenzene MR 5 SDWIS / SD4600376 / 2992
2009 1,2,4-Trichlorobenzene MR 5 SDWIS / SD4600376 / 2378
2009 1,1-Dichloroethylene MR 5 SDWIS / SD4600376 / 2977
2009 Carbon tetrachloride MR 5 SDWIS / SD4600376 / 2982
2009 o-Dichlorobenzene MR 5 SDWIS / SD4600376 / 2968
2009 trans-1,2-Dichloroethylene MR 5 SDWIS / SD4600376 / 2979
2009 p-Dichlorobenzene MR 5 SDWIS / SD4600376 / 2969
2009 1,2-Dichloroethane MR 5 SDWIS / SD4600376 / 2980
2009 Trichloroethylene MR 5 SDWIS / SD4600376 / 2984

How WOONSOCKET Compares

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

Metric WOONSOCKET South Dakota avg Federal benchmark
Total violations 147 86 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 13 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 618 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 WOONSOCKET water safe to drink? ▼
WOONSOCKET (PWS ID: SD4600376) has 147 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 618 people using Groundwater sources.
How many people does WOONSOCKET serve? ▼
WOONSOCKET serves 618 people in WOONSOCKET, South Dakota. It is a Local-owned system using Groundwater water sources with 330 service connections.
What type of violations does WOONSOCKET have? ▼
WOONSOCKET has 147 total violations: 13 health-based violations (MCL exceedances or treatment failures), 124 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in WOONSOCKET water? ▼
No PFAS testing data is available for WOONSOCKET under the EPA's UCMR5 monitoring program.
What water source does WOONSOCKET use? ▼
WOONSOCKET 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