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Community Water System · PWS SD4600053

Terry Trojan Water District

Black Hawk, South Dakota 57718 - drinking water served from groundwater sources to 400 people, tracked in EPA SDWIS and UCMR5.

400
People served
419
EPA violations
22
Health-based
Untested
UCMR5 result

The verdict

EPA records 419 drinking-water violations at Terry Trojan Water District, 5% of them health-based - above the South Dakota per-system average.

419
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
400
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Terry Trojan Water District

Terry Trojan Water District is a private-owned community water system that delivers drinking water to 400 residents in Black Hawk, South Dakota (Lawrence County) through 220 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 419 total violations for this system , of which 22 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 388 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 Arsenic, recorded in 13 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. Statewide, 42 of 49 UCMR5-tested systems have reported PFAS detections (85.7%).

Terry Trojan Water District's 419 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
400
Total Violations
419
Health-Based Violations
22
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
220
County
Lawrence
School/Daycare
No
MCL Violations
20
Monitoring Violations
388
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 13 2008
Heptachlor MR 12 2006
Heptachlor epoxide MR 12 2006
Atrazine MR 12 2006
Benzo(a)pyrene MR 12 2006
Di(2-ethylhexyl) adipate MR 12 2006
HEXACHLOROBENZENE MR 12 2006
BHC-GAMMA MR 12 2006
Dalapon MR 12 2006
Pentachlorophenol MR 12 2006
Glyphosate MR 12 2006
Diquat MR 12 2006
Chlorine MR 12 2006
Methoxychlor MR 12 2006
Total Polychlorinated Biphenyls (PCB) MR 12 2006
Di(2-ethylhexyl) phthalate MR 12 2006
Hexachlorocyclopentadiene MR 12 2006
Endrin MR 12 2006
Toxaphene MR 12 2006
Simazine MR 12 2006
OXAMYL MR 12 2006
Dinoseb MR 12 2006
2,4,5-TP MR 12 2006
2,4-D MR 12 2006
ETHYLENE DIBROMIDE MR 12 2006
LASSO MR 12 2006
Chlordane MR 12 2006
Picloram MR 12 2006
1,2-DIBROMO-3-CHLOROPROPANE MR 12 2006
Carbofuran MR 12 2006

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 Terry Trojan Water District.

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 SD4600053 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
2011 Lead and Copper Rule MR 6 SDWIS / SD4600053 / 5000
2008 Arsenic MCL 13 SDWIS / SD4600053 / 1005
2008 Public Notice Other 4 SDWIS / SD4600053 / 7500
2006 Heptachlor MR 12 SDWIS / SD4600053 / 2065
2006 Heptachlor epoxide MR 12 SDWIS / SD4600053 / 2067
2006 Atrazine MR 12 SDWIS / SD4600053 / 2050
2006 Benzo(a)pyrene MR 12 SDWIS / SD4600053 / 2306
2006 Di(2-ethylhexyl) adipate MR 12 SDWIS / SD4600053 / 2035
2006 HEXACHLOROBENZENE MR 12 SDWIS / SD4600053 / 2274
2006 BHC-GAMMA MR 12 SDWIS / SD4600053 / 2010
2006 Dalapon MR 12 SDWIS / SD4600053 / 2031
2006 Pentachlorophenol MR 12 SDWIS / SD4600053 / 2326
2006 Glyphosate MR 12 SDWIS / SD4600053 / 2034
2006 Diquat MR 12 SDWIS / SD4600053 / 2032
2006 Chlorine MR 12 SDWIS / SD4600053 / 0999

How Terry Trojan Water District Compares

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

Metric Terry Trojan Water District South Dakota avg Federal benchmark
Total violations 419 86 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 22 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 400 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 Terry Trojan Water District water safe to drink? ▼
Terry Trojan Water District (PWS ID: SD4600053) has 419 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 400 people using Groundwater sources.
How many people does Terry Trojan Water District serve? ▼
Terry Trojan Water District serves 400 people in Black Hawk, South Dakota. It is a Private-owned system using Groundwater water sources with 220 service connections.
What type of violations does Terry Trojan Water District have? ▼
Terry Trojan Water District has 419 total violations: 22 health-based violations (MCL exceedances or treatment failures), 388 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Terry Trojan Water District water? ▼
No PFAS testing data is available for Terry Trojan Water District under the EPA's UCMR5 monitoring program.
What water source does Terry Trojan Water District use? ▼
Terry Trojan Water District 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.