Public water system · SD4600398
ActiveLake Preston
At a glance
Lake Preston (PWSID SD4600398) is an active community water system in Kingsbury County, South Dakota. It reports serving 589 people through 332 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, 4 are health-based, and the most recent began in April 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
589
Service connections
332
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Lake Preston compare with other water systems in Kingsbury County?
By EPA's size categories, Lake Preston is a small system (501 to 3,300 people). Kingsbury County has 7 active public water systems, and Lake Preston is the 4th-largest of them by population served. Its population served is about 29% below the county average of 827 people per system, and accounts for 10% of the 5,786 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 Lake Preston 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 Lake Preston?
EPA lists Lake Preston 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. 5 of the 7 active systems in Kingsbury County (71%) are also owned by a local government.
Does Lake Preston have drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in April 2020. The violations listed here began between November 1996 and April 2020. By type: 5 monitoring and reporting, 4 required treatment not met, 2 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Stage 1 Disinfectants and Disinfection Byproducts Rule (4 of them). EPA lists 11 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2020-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2020-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-09-27 | Public notice, recordkeeping or otherFailure to Notify Other PWS · code 73 | Groundwater Rulecode 0700 | No | Resolved |
| 2017-05-30 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2013-10-01 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2012-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2011-10-28 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2011-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2009-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2009-02-01 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2003-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1996-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
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.
Lake Preston: frequently asked questions
Who runs Lake Preston?
Lake Preston (PWSID SD4600398) is a community water system owned by a local government. It is regulated by the SD state drinking water program.
How many people does Lake Preston serve?
Lake Preston reports serving 589 people through 332 service connections in Kingsbury County, South Dakota.
Where does Lake Preston 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 Lake Preston have any drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in April 2020. 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 Lake Preston'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, 4 are health-based, and the most recent began in April 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Lake Preston's water quality report?
As a community water system, Lake Preston 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 Kingsbury County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Kingbrook Ii Rural Water System | Kingsbury | 2,715 | Community | Groundwater |
| De Smet | Kingsbury | 1,056 | Community | Groundwater |
| Arlington | Kingsbury | 915 | Community | Purchased groundwater |
| Iroquois | Kingsbury + 1 more | 292 | Community | Purchased groundwater |
| Spring Lake Colony | Kingsbury | 114 | Community | Groundwater |
| Badger | Kingsbury | 105 | 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, “Lake Preston, PWSID SD4600398, South Dakota”, https://aquacensus.com/water-systems/south-dakota/lake-preston-sd4600398 (data as of October 1, 2026).