Public water system · SD4600371
ActiveWilmot
At a glance
Wilmot (PWSID SD4600371) is an active community water system in Roberts County, South Dakota. It reports serving 432 people through 280 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in August 2012.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
432
Service connections
280
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Wilmot compare with other water systems in Roberts County?
By EPA's size categories, Wilmot is a very small system (500 people or fewer). Roberts County has 11 active public water systems, and Wilmot is the 4th-largest of them by population served. Its population served is about 24% below the county average of 565 people per system, and accounts for 6.9% of the 6,217 people reported by systems filed under the county. Across South Dakota, the 699 active systems average 1,387 people each. Nationally, the average active community water system reports serving 6,703 people, so Wilmot is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. South Dakota has 510 active community water systems, 73% of the state's 699 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 100 South Dakota systems (14%) list purchased groundwater as their primary source.
Who owns and regulates Wilmot?
EPA lists Wilmot as owned by a local government. The SD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 7 of the 11 active systems in Roberts County (64%) are also owned by a local government.
Does Wilmot have drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in August 2012. The violations listed here began between April 1998 and August 2012. By type: 10 monitoring and reporting and 2 required treatment not met. The contaminant or rule involved most often is Stage 1 Disinfectants and Disinfection Byproducts Rule (2 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2012-08-03 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2011-03-21 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2009-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2000-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzenecode 2990 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Vinyl chloridecode 2976 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | cis-1,2-Dichloroethylenecode 2380 | No | Resolved |
| 1998-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dichloromethanecode 2964 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Wilmot: frequently asked questions
Who runs Wilmot?
Wilmot (PWSID SD4600371) is a community water system owned by a local government. It is regulated by the SD state drinking water program.
How many people does Wilmot serve?
Wilmot reports serving 432 people through 280 service connections in Roberts County, South Dakota.
Where does Wilmot get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Wilmot have any drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in August 2012. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Wilmot's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in August 2012. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Wilmot's water quality report?
As a community water system, Wilmot must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Roberts County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sisseton | Roberts | 2,479 | Community | Groundwater |
| Dot Rest Area 119 - Glacial Lakes | Roberts | 1,000 | Transient non-community | Groundwater |
| Dot Rest Area - Whetstone Valley | Roberts | 1,000 | Transient non-community | Groundwater |
| Rosholt | Roberts | 379 | Community | Groundwater |
| Summit | Roberts | 288 | Community | Groundwater |
| New Effington | Roberts | 247 | Community | Purchased groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Wilmot, PWSID SD4600371, South Dakota”, https://aquacensus.com/water-systems/south-dakota/wilmot-sd4600371 (data as of October 1, 2026).