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Community Water System · PWS SD4600391

Crooks

Crooks, South Dakota 57020 - drinking water served from groundwater sources to 1,362 people, tracked in EPA SDWIS and UCMR5.

1,362
People served
100
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 100 drinking-water violations at Crooks - above the South Dakota per-system average.

100
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
1,362
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Crooks

Crooks is a local-owned community water system that delivers drinking water to 1,362 residents in Crooks, South Dakota (Minnehaha County) through 545 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 100 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 93 monitoring and reporting violations are on file. The most recent violation on record dates to 1999.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 14 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%).

Crooks's 100 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
1,362
Total Violations
100
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
545
County
Minnehaha
School/Daycare
No
MCL Violations
0
Monitoring Violations
93
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 14 1998
Coliform (TCR) MR 8 1999
Nitrate MR 3 1995
Atrazine MR 2 1993
Benzo(a)pyrene MR 2 1993
Methoxychlor MR 2 1993
Total Polychlorinated Biphenyls (PCB) MR 2 1993
Di(2-ethylhexyl) adipate MR 2 1993
Di(2-ethylhexyl) phthalate MR 2 1993
Endrin MR 2 1993
HEXACHLOROBENZENE MR 2 1993
BHC-GAMMA MR 2 1993
Chlordane MR 2 1993
Simazine MR 2 1993
Aldicarb sulfone MR 2 1993
Carbofuran MR 2 1993
OXAMYL MR 2 1993
Dalapon MR 2 1993
2,4,5-TP MR 2 1993
Picloram MR 2 1993
2,4-D MR 2 1993
Glyphosate MR 2 1993
Diquat MR 2 1993
1,2-DIBROMO-3-CHLOROPROPANE MR 2 1993
Heptachlor epoxide MR 2 1993
Hexachlorocyclopentadiene MR 2 1993
Dinoseb MR 2 1993
LASSO MR 2 1993
ETHYLENE DIBROMIDE MR 2 1993
Pentachlorophenol 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 Crooks.

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 SD4600391 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
1999 Coliform (TCR) MR 8 SDWIS / SD4600391 / 3100
1998 Lead and Copper Rule MR 14 SDWIS / SD4600391 / 5000
1998 Coliform (TCR) Other 1 SDWIS / SD4600391 / 3100
1995 Nitrate MR 3 SDWIS / SD4600391 / 1040
1993 Atrazine MR 2 SDWIS / SD4600391 / 2050
1993 Benzo(a)pyrene MR 2 SDWIS / SD4600391 / 2306
1993 Methoxychlor MR 2 SDWIS / SD4600391 / 2015
1993 Total Polychlorinated Biphenyls (PCB) MR 2 SDWIS / SD4600391 / 2383
1993 Di(2-ethylhexyl) adipate MR 2 SDWIS / SD4600391 / 2035
1993 Di(2-ethylhexyl) phthalate MR 2 SDWIS / SD4600391 / 2039
1993 Endrin MR 2 SDWIS / SD4600391 / 2005
1993 HEXACHLOROBENZENE MR 2 SDWIS / SD4600391 / 2274
1993 BHC-GAMMA MR 2 SDWIS / SD4600391 / 2010
1993 Chlordane MR 2 SDWIS / SD4600391 / 2959
1993 Simazine MR 2 SDWIS / SD4600391 / 2037

How Crooks Compares

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

Metric Crooks South Dakota avg Federal benchmark
Total violations 100 86 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 1,362 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 Crooks water safe to drink? ▼
Crooks (PWS ID: SD4600391) has 100 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,362 people using Groundwater sources.
How many people does Crooks serve? ▼
Crooks serves 1,362 people in Crooks, South Dakota. It is a Local-owned system using Groundwater water sources with 545 service connections.
What type of violations does Crooks have? ▼
Crooks has 100 total violations: 0 health-based violations (MCL exceedances or treatment failures), 93 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Crooks water? ▼
No PFAS testing data is available for Crooks under the EPA's UCMR5 monitoring program.
What water source does Crooks use? ▼
Crooks 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.