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Community Water System · PWS SD4600162

Hosmer

Hosmer, South Dakota 57448 - drinking water served from surface water sources to 164 people, tracked in EPA SDWIS and UCMR5.

164
People served
19
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 19 drinking-water violations at Hosmer, 16% of them health-based - below the South Dakota per-system average.

19
Total EPA violations on record
16%
Health-based (MCL / treatment failure)
164
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hosmer

Hosmer is a local-owned community water system that delivers drinking water to 164 residents in Hosmer, South Dakota (Edmunds County) through 142 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 19 total violations for this system , of which 3 (16%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 9 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 3 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%).

Hosmer's 19 violations sit below 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
164
Total Violations
19
Health-Based Violations
3
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
142
County
Edmunds
School/Daycare
No
MCL Violations
0
Monitoring Violations
9
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 3 1998
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 3 2023
Consumer Confidence Rule Other 2 2003
Nitrate MR 2 1993
Revised Total Coliform Rule MON 2 2025
Gross Alpha, Excl. Radon and U MR 1 1976
Combined Radium (-226 and -228) MR 1 1976

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 Hosmer.

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 SD4600162 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
2025 Revised Total Coliform Rule MON 2 SDWIS / SD4600162 / 8000
2023 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 3 SDWIS / SD4600162 / 0400
2003 Consumer Confidence Rule Other 2 SDWIS / SD4600162 / 7000
1998 Coliform (TCR) MR 3 SDWIS / SD4600162 / 3100
1993 Nitrate MR 2 SDWIS / SD4600162 / 1040
1976 Gross Alpha, Excl. Radon and U MR 1 SDWIS / SD4600162 / 4000
1976 Combined Radium (-226 and -228) MR 1 SDWIS / SD4600162 / 4010

How Hosmer Compares

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

Metric Hosmer South Dakota avg Federal benchmark
Total violations 19 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 164 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 Hosmer water safe to drink? ▼
Hosmer (PWS ID: SD4600162) has 19 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 164 people using Surface Water sources.
How many people does Hosmer serve? ▼
Hosmer serves 164 people in Hosmer, South Dakota. It is a Local-owned system using Surface Water water sources with 142 service connections.
What type of violations does Hosmer have? ▼
Hosmer has 19 total violations: 3 health-based violations (MCL exceedances or treatment failures), 9 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hosmer water? ▼
No PFAS testing data is available for Hosmer under the EPA's UCMR5 monitoring program.
What water source does Hosmer use? ▼
Hosmer 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.
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.