PlainWater
States → South Dakota

CLARK RURAL WATER SYSTEM

PWS ID: SD4600881 · CLARK, South Dakota 57225

CLARK RURAL WATER SYSTEM serves 2,325 people in CLARK, South Dakota using Groundwater water sources. It has 68 recorded EPA violations, including 2 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: CLARK RURAL WATER SYSTEM

CLARK RURAL WATER SYSTEM is a private-owned community water system that delivers drinking water to 2,325 residents in CLARK, South Dakota (Clark County) through 1,080 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 68 total violations for this system , of which 2 (3%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 64 monitoring and reporting violations are on file. The most recent violation on record dates to 2004.

The most frequently cited contaminant at this system is Acrylamide, recorded in 2 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 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. CLARK RURAL WATER SYSTEM's 68 violations sit below 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
2,325
Total Violations
68
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
1,080
County
Clark
School/Daycare
No
MCL Violations
0
Monitoring Violations
64
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Acrylamide TT 2 2004
Heptachlor epoxide MR 2 1996
Atrazine MR 2 1996
Total Polychlorinated Biphenyls (PCB) MR 2 1996
Endrin MR 2 1996
BHC-GAMMA MR 2 1996
Dalapon MR 2 1996
2,4,5-TP MR 2 1996
Pentachlorophenol MR 2 1996
Picloram MR 2 1996
Aldicarb sulfone MR 2 1996
Aldicarb sulfoxide MR 2 1996
OXAMYL MR 2 1996
Glyphosate MR 2 1996
Endothall MR 2 1996
Diquat MR 2 1996
1,2-DIBROMO-3-CHLOROPROPANE MR 2 1996
ETHYLENE DIBROMIDE MR 2 1996
Aldicarb MR 2 1996
Hexachlorocyclopentadiene MR 2 1996
2,4-D MR 2 1996
Chlordane MR 2 1996
LASSO MR 2 1996
Methoxychlor MR 2 1996
HEXACHLOROBENZENE MR 2 1996
Dinoseb MR 2 1996
Heptachlor MR 2 1996
Di(2-ethylhexyl) phthalate MR 2 1996
Carbofuran MR 2 1996
Simazine MR 2 1996

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 CLARK RURAL WATER SYSTEM.

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 SD4600881 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
2004 Acrylamide TT 2 SDWIS / SD4600881 / 2265
1996 Heptachlor epoxide MR 2 SDWIS / SD4600881 / 2067
1996 Atrazine MR 2 SDWIS / SD4600881 / 2050
1996 Total Polychlorinated Biphenyls (PCB) MR 2 SDWIS / SD4600881 / 2383
1996 Endrin MR 2 SDWIS / SD4600881 / 2005
1996 BHC-GAMMA MR 2 SDWIS / SD4600881 / 2010
1996 Dalapon MR 2 SDWIS / SD4600881 / 2031
1996 2,4,5-TP MR 2 SDWIS / SD4600881 / 2110
1996 Pentachlorophenol MR 2 SDWIS / SD4600881 / 2326
1996 Picloram MR 2 SDWIS / SD4600881 / 2040
1996 Aldicarb sulfone MR 2 SDWIS / SD4600881 / 2044
1996 Aldicarb sulfoxide MR 2 SDWIS / SD4600881 / 2043
1996 OXAMYL MR 2 SDWIS / SD4600881 / 2036
1996 Glyphosate MR 2 SDWIS / SD4600881 / 2034
1996 Endothall MR 2 SDWIS / SD4600881 / 2033

How CLARK RURAL WATER SYSTEM Compares

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

Metric CLARK RURAL WATER SYSTEM South Dakota avg Federal benchmark
Total violations 68 86 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 2 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 2,325 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 CLARK RURAL WATER SYSTEM water safe to drink? ▼
CLARK RURAL WATER SYSTEM (PWS ID: SD4600881) has 68 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,325 people using Groundwater sources.
How many people does CLARK RURAL WATER SYSTEM serve? ▼
CLARK RURAL WATER SYSTEM serves 2,325 people in CLARK, South Dakota. It is a Private-owned system using Groundwater water sources with 1,080 service connections.
What type of violations does CLARK RURAL WATER SYSTEM have? ▼
CLARK RURAL WATER SYSTEM has 68 total violations: 2 health-based violations (MCL exceedances or treatment failures), 64 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in CLARK RURAL WATER SYSTEM water? ▼
No PFAS testing data is available for CLARK RURAL WATER SYSTEM under the EPA's UCMR5 monitoring program.
What water source does CLARK RURAL WATER SYSTEM use? ▼
CLARK RURAL WATER SYSTEM 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.

Explore PlainWater

Water in South Dakota

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for South Dakota

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →
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.

Related

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