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BISON

PWS ID: SD4600039 · BISON, South Dakota 57620

BISON serves 310 people in BISON, South Dakota using Surface Water water sources. It has 105 recorded EPA violations, including 15 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: BISON

BISON is a local-owned community water system that delivers drinking water to 310 residents in BISON, South Dakota (Perkins County) through 228 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 105 total violations for this system , of which 15 (14%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 84 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 Chlorine, recorded in 11 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. BISON's 105 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
310
Total Violations
105
Health-Based Violations
15
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
228
County
Perkins
School/Daycare
No
MCL Violations
10
Monitoring Violations
84
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 11 2016
Coliform (TCR) MCL 10 2013
Revised Total Coliform Rule MON 8 2024
Coliform (TCR) MR 8 2010
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 5 2016
Lead and Copper Rule MR 4 1994
Asbestos MR 3 1993
TTHM MR 3 2015
Total Haloacetic Acids (HAA5) MR 3 2015
Consumer Confidence Rule Other 2 2008
cis-1,2-Dichloroethylene MR 2 1993
Vinyl chloride MR 2 1993
1,1,1-Trichloroethane MR 2 1993
Tetrachloroethylene MR 2 1993
1,1,2-Trichloroethane MR 2 1993
Xylenes, Total MR 2 1993
Carbon tetrachloride MR 2 1993
CHLOROBENZENE MR 2 1993
o-Dichlorobenzene MR 2 1993
trans-1,2-Dichloroethylene MR 2 1993
1,2-Dichloropropane MR 2 1993
1,2-Dichloroethane MR 2 1993
Trichloroethylene MR 2 1993
Toluene MR 2 1993
Benzene MR 2 1993
Ethylbenzene MR 2 1993
1,2,4-Trichlorobenzene MR 2 1993
Styrene MR 2 1993
DICHLOROMETHANE MR 2 1993
p-Dichlorobenzene 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 BISON.

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 SD4600039 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 Revised Total Coliform Rule MON 8 SDWIS / SD4600039 / 8000
2016 Chlorine MR 11 SDWIS / SD4600039 / 0999
2016 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 5 SDWIS / SD4600039 / 0400
2015 TTHM MR 3 SDWIS / SD4600039 / 2950
2015 Total Haloacetic Acids (HAA5) MR 3 SDWIS / SD4600039 / 2456
2013 Coliform (TCR) MCL 10 SDWIS / SD4600039 / 3100
2010 Coliform (TCR) MR 8 SDWIS / SD4600039 / 3100
2008 Consumer Confidence Rule Other 2 SDWIS / SD4600039 / 7000
1994 Lead and Copper Rule MR 4 SDWIS / SD4600039 / 5000
1993 Asbestos MR 3 SDWIS / SD4600039 / 1094
1993 cis-1,2-Dichloroethylene MR 2 SDWIS / SD4600039 / 2380
1993 Vinyl chloride MR 2 SDWIS / SD4600039 / 2976
1993 1,1,1-Trichloroethane MR 2 SDWIS / SD4600039 / 2981
1993 Tetrachloroethylene MR 2 SDWIS / SD4600039 / 2987
1993 1,1,2-Trichloroethane MR 2 SDWIS / SD4600039 / 2985

How BISON Compares

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

Metric BISON South Dakota avg Federal benchmark
Total violations 105 86 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 15 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 310 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 BISON water safe to drink? ▼
BISON (PWS ID: SD4600039) has 105 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 310 people using Surface Water sources.
How many people does BISON serve? ▼
BISON serves 310 people in BISON, South Dakota. It is a Local-owned system using Surface Water water sources with 228 service connections.
What type of violations does BISON have? ▼
BISON has 105 total violations: 15 health-based violations (MCL exceedances or treatment failures), 84 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in BISON water? ▼
No PFAS testing data is available for BISON under the EPA's UCMR5 monitoring program.
What water source does BISON use? ▼
BISON uses Surface Water 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