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Community Water System · PWS SD4600217

Montrose

Montrose, South Dakota 57048 - drinking water served from groundwater sources to 468 people, tracked in EPA SDWIS and UCMR5.

468
People served
327
EPA violations
15
Health-based
Untested
UCMR5 result

The verdict

EPA records 327 drinking-water violations at Montrose, 5% of them health-based - above the South Dakota per-system average.

327
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
468
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Montrose

Montrose is a local-owned community water system that delivers drinking water to 468 residents in Montrose, South Dakota (McCook County) through 170 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 327 total violations for this system , of which 15 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 287 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 30 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%).

Montrose's 327 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
468
Total Violations
327
Health-Based Violations
15
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
170
County
McCook
School/Daycare
No
MCL Violations
4
Monitoring Violations
287
Treatment Tech Violations
11

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 30 2014
Chlorine MR 14 2022
Nitrate MR 12 2004
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 11 2018
1,1,2-Trichloroethane MR 7 1994
cis-1,2-Dichloroethylene MR 6 1994
Vinyl chloride MR 6 1994
1,2,4-Trichlorobenzene MR 6 1994
o-Dichlorobenzene MR 6 1994
trans-1,2-Dichloroethylene MR 6 1994
1,2-Dichloropropane MR 6 1994
Trichloroethylene MR 6 1994
Endothall MR 6 1996
1,1,1-Trichloroethane MR 6 1994
Tetrachloroethylene MR 6 1994
Ethylbenzene MR 6 1994
Xylenes, Total MR 6 1994
Benzene MR 6 1994
p-Dichlorobenzene MR 6 1994
DICHLOROMETHANE MR 6 1994
1,1-Dichloroethylene MR 6 1994
Carbon tetrachloride MR 6 1994
CHLOROBENZENE MR 6 1994
Styrene MR 6 1994
1,2-Dichloroethane MR 6 1994
Toluene MR 6 1994
Public Notice Other 5 2005
Coliform (TCR) MCL 4 1991
Asbestos MR 3 1993
Heptachlor MR 3 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 Montrose.

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 SD4600217 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
2022 Chlorine MR 14 SDWIS / SD4600217 / 0999
2018 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 11 SDWIS / SD4600217 / 0400
2014 Coliform (TCR) MR 30 SDWIS / SD4600217 / 3100
2005 Public Notice Other 5 SDWIS / SD4600217 / 7500
2004 Nitrate MR 12 SDWIS / SD4600217 / 1040
2002 Consumer Confidence Rule Other 2 SDWIS / SD4600217 / 7000
1996 Endothall MR 6 SDWIS / SD4600217 / 2033
1994 1,1,2-Trichloroethane MR 7 SDWIS / SD4600217 / 2985
1994 cis-1,2-Dichloroethylene MR 6 SDWIS / SD4600217 / 2380
1994 Vinyl chloride MR 6 SDWIS / SD4600217 / 2976
1994 1,2,4-Trichlorobenzene MR 6 SDWIS / SD4600217 / 2378
1994 o-Dichlorobenzene MR 6 SDWIS / SD4600217 / 2968
1994 trans-1,2-Dichloroethylene MR 6 SDWIS / SD4600217 / 2979
1994 1,2-Dichloropropane MR 6 SDWIS / SD4600217 / 2983
1994 Trichloroethylene MR 6 SDWIS / SD4600217 / 2984

How Montrose Compares

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

Metric Montrose South Dakota avg Federal benchmark
Total violations 327 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 468 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 Montrose water safe to drink? ▼
Montrose (PWS ID: SD4600217) has 327 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 468 people using Groundwater sources.
How many people does Montrose serve? ▼
Montrose serves 468 people in Montrose, South Dakota. It is a Local-owned system using Groundwater water sources with 170 service connections.
What type of violations does Montrose have? ▼
Montrose has 327 total violations: 15 health-based violations (MCL exceedances or treatment failures), 287 monitoring/reporting violations, and 11 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Montrose water? ▼
No PFAS testing data is available for Montrose under the EPA's UCMR5 monitoring program.
What water source does Montrose use? ▼
Montrose 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.