Public water system · SD4600147
ActiveGroton
At a glance
Groton (PWSID SD4600147) is an active community water system in Brown County, South Dakota. It reports serving 1,380 people through 657 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in April 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,380
Service connections
657
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Groton compare with other water systems in Brown County?
By EPA's size categories, Groton is a small system (501 to 3,300 people). Brown County has 21 active public water systems, and Groton is the 3rd-largest of them by population served. Its population served is about 24% below the county average of 1,813 people per system, and accounts for 3.6% 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 Groton 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 surface water means the system buys surface water from another public water system rather than drawing its own. 142 South Dakota systems (20%) list purchased surface water as their primary source.
Who owns and regulates Groton?
EPA lists Groton 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. 8 of the 21 active systems in Brown County (38%) are also owned by a local government.
Does Groton have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in April 2023. The violations listed here began between July 1976 and April 2023. By type: 6 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 4 as archived and 2 as resolved. 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. 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 |
|---|---|---|---|---|
| 2023-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 1996-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1995-08-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1991-10-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Archived |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 6 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.
Groton: frequently asked questions
Who runs Groton?
Groton (PWSID SD4600147) is a community water system owned by a local government. It is regulated by the SD state drinking water program.
How many people does Groton serve?
Groton reports serving 1,380 people through 657 service connections in Brown County, South Dakota.
Where does Groton get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Groton have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in April 2023. 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 Groton'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. EPA's records list 6 violations for this system; none is health-based, and the most recent began in April 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Groton's water quality report?
As a community water system, Groton 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 |
| Warner | Brown | 485 | Community | Purchased surface water |
| Lakeside Estates | Brown | 460 | Community | Purchased surface water |
| Country Village Park | Brown | 340 | Community | Purchased surface water |
| Prairiewood Property Owners | Brown | 300 | Community | Purchased surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Groton, PWSID SD4600147, South Dakota”, https://aquacensus.com/water-systems/south-dakota/groton-sd4600147 (data as of October 1, 2026).