Public water system · SD4602051
ActiveLong Lake Colony
At a glance
Long Lake Colony (PWSID SD4602051) is an active community water system in Brown County, South Dakota. It reports serving 100 people through 26 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in September 2012.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
100
Service connections
26
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Long Lake Colony compare with other water systems in Brown County?
By EPA's size categories, Long Lake Colony is a very small system (500 people or fewer). Brown County has 21 active public water systems. Its population served is well below the county average of 1,813 people per system, and accounts for 0.3% of the 38,073 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 Long Lake Colony 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 431 South Dakota systems (62%) list groundwater as their primary source.
Who owns and regulates Long Lake Colony?
EPA lists Long Lake Colony as privately owned. 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. 13 of the 21 active systems in Brown County (62%) are also privately owned.
Does Long Lake Colony have drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in September 2012. The violations listed here began between May 1997 and September 2012. By type: 5 monitoring and reporting, 5 contaminant level above the legal limit and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (10 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 |
|---|---|---|---|---|
| 2012-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-11-10 | Public notice, recordkeeping or otherSanitary Survey (TCR) · code 28 | Not reported | No | Resolved |
| 2004-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-12-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2000-10-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2000-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1997-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-06-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Long Lake Colony: frequently asked questions
Who runs Long Lake Colony?
Long Lake Colony (PWSID SD4602051) is a community water system privately owned. It is regulated by the SD state drinking water program.
How many people does Long Lake Colony serve?
Long Lake Colony reports serving 100 people through 26 service connections in Brown County, South Dakota.
Where does Long Lake Colony get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Long Lake Colony have any drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in September 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 Long Lake Colony'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, 5 are health-based, and the most recent began in September 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 Long Lake Colony's water quality report?
As a community water system, Long Lake Colony 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 Brown County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Aberdeen | Brown | 27,989 | Community | Surface water |
| Brown-Day-Marshall Rws | Brown + 2 more | 5,673 | Community | Groundwater |
| Groton | Brown | 1,380 | Community | Purchased surface water |
| Warner | Brown | 485 | Community | Purchased surface water |
| Lakeside Estates | Brown | 460 | Community | Purchased surface water |
| Country Village Park | Brown | 340 | Community | Purchased surface water |
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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, “Long Lake Colony, PWSID SD4602051, South Dakota”, https://aquacensus.com/water-systems/south-dakota/long-lake-colony-sd4602051 (data as of October 1, 2026).