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Community Water System · PWS SD4600143

T C & G Rural Water System

Mobridge, South Dakota 57601 - drinking water served from groundwater sources to 166 people, tracked in EPA SDWIS and UCMR5.

166
People served
132
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 132 drinking-water violations at T C & G Rural Water System, 2% of them health-based - above the South Dakota per-system average.

132
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
166
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: T C & G Rural Water System

T C & G Rural Water System is a private-owned community water system that delivers drinking water to 166 residents in Mobridge, South Dakota (Dewey County) through 79 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 132 total violations for this system , of which 3 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 114 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 6 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. Statewide, 42 of 49 UCMR5-tested systems have reported PFAS detections (85.7%).

T C & G Rural Water System's 132 violations sit above the South Dakota 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
166
Total Violations
132
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
79
County
Dewey
School/Daycare
No
MCL Violations
3
Monitoring Violations
114
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 6 2015
Chlorine MR 3 2015
Coliform (TCR) MCL 3 2007
Lead and Copper Rule MR 3 2011
LASSO MR 2 2017
Benzo(a)pyrene MR 2 2017
Di(2-ethylhexyl) adipate MR 2 2017
Di(2-ethylhexyl) phthalate MR 2 2017
Hexachlorocyclopentadiene MR 2 2017
HEXACHLOROBENZENE MR 2 2017
BHC-GAMMA MR 2 2017
Simazine MR 2 2017
Carbofuran MR 2 2017
OXAMYL MR 2 2017
2,4,5-TP MR 2 2017
Pentachlorophenol MR 2 2017
Picloram MR 2 2017
2,4-D MR 2 2017
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2017
Endothall MR 2 2017
Glyphosate MR 2 2017
Vinyl chloride MR 2 2017
DICHLOROMETHANE MR 2 2017
1,1,2-Trichloroethane MR 2 2017
Xylenes, Total MR 2 2017
1,1-Dichloroethylene MR 2 2017
CHLOROBENZENE MR 2 2017
trans-1,2-Dichloroethylene MR 2 2017
Benzene MR 2 2017
p-Dichlorobenzene MR 2 2017

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 T C & G 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 SD4600143 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
2021 Revised Total Coliform Rule RPT 2 SDWIS / SD4600143 / 8000
2017 LASSO MR 2 SDWIS / SD4600143 / 2051
2017 Benzo(a)pyrene MR 2 SDWIS / SD4600143 / 2306
2017 Di(2-ethylhexyl) adipate MR 2 SDWIS / SD4600143 / 2035
2017 Di(2-ethylhexyl) phthalate MR 2 SDWIS / SD4600143 / 2039
2017 Hexachlorocyclopentadiene MR 2 SDWIS / SD4600143 / 2042
2017 HEXACHLOROBENZENE MR 2 SDWIS / SD4600143 / 2274
2017 BHC-GAMMA MR 2 SDWIS / SD4600143 / 2010
2017 Simazine MR 2 SDWIS / SD4600143 / 2037
2017 Carbofuran MR 2 SDWIS / SD4600143 / 2046
2017 OXAMYL MR 2 SDWIS / SD4600143 / 2036
2017 2,4,5-TP MR 2 SDWIS / SD4600143 / 2110
2017 Pentachlorophenol MR 2 SDWIS / SD4600143 / 2326
2017 Picloram MR 2 SDWIS / SD4600143 / 2040
2017 2,4-D MR 2 SDWIS / SD4600143 / 2105

How T C & G Rural Water System Compares

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

Metric T C & G Rural Water System South Dakota avg Federal benchmark
Total violations 132 86 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 166 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 (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 T C & G Rural Water System water safe to drink? ▼
T C & G Rural Water System (PWS ID: SD4600143) has 132 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 166 people using Groundwater sources.
How many people does T C & G Rural Water System serve? ▼
T C & G Rural Water System serves 166 people in Mobridge, South Dakota. It is a Private-owned system using Groundwater water sources with 79 service connections.
What type of violations does T C & G Rural Water System have? ▼
T C & G Rural Water System has 132 total violations: 3 health-based violations (MCL exceedances or treatment failures), 114 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in T C & G Rural Water System water? ▼
No PFAS testing data is available for T C & G Rural Water System under the EPA's UCMR5 monitoring program.
What water source does T C & G Rural Water System use? ▼
T C & G 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.
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.