Brown County, South Dakota — public water systems

At a glance

21 active public water systems are filed under Brown County, South Dakota in EPA's SDWIS records, together reporting 38,073 people served. The largest is Aberdeen, which reports serving 27,989 people. All 21 are community water systems serving people where they live.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

Population served

38.1K

Community systems

Groundwater share

23.8%

How does Brown County compare with other South Dakota counties?

Brown County has the 5th-most active public water systems among the 73 counties listed for active South Dakota systems in EPA records; among the 48 with 3 or more systems, the median has 6. Its systems report 38,073 people served in total, the 4th-largest county figure in the state and 3.9% of the statewide total. The average system here reports serving 1,813 people, about 31% above the South Dakota average of 1,387. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Brown County's drinking water come from?

By primary water source, Brown County's active systems draw on purchased surface water (15, 71%), groundwater (3, 14%), purchased groundwater (2, 9.5%) and surface water (1, 4.8%). Overall, 24% rely mainly on groundwater (including purchased groundwater) and 76% on surface water, compared with 76% and 24% across South Dakota. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. The county's largest system, Aberdeen, draws primarily on surface water.

What kinds of water systems operate in Brown County?

Brown County's active systems break down as 21 community systems (100%). 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. EPA lists their owner types as private (62%) and local government (38%).

Water systems in Brown County

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Active public water systems in Brown County, South Dakota
#	Water system	County	Population served	Type	Source
1	Aberdeen	Brown	27,989	Community	Surface water
2	Brown-Day-Marshall Rws	Brown + 2 more	5,673	Community	Groundwater
3	Groton	Brown	1,380	Community	Purchased surface water
4	Warner	Brown	485	Community	Purchased surface water
5	Lakeside Estates	Brown	460	Community	Purchased surface water
6	Country Village Park	Brown	340	Community	Purchased surface water
7	Prairiewood Property Owners	Brown	300	Community	Purchased surface water
8	Frederick	Brown	215	Community	Purchased surface water
9	Hecla	Brown	200	Community	Purchased groundwater
10	Jobee Acres	Brown	108	Community	Purchased surface water
11	Claremont	Brown	108	Community	Purchased groundwater
12	Pleasant Valley Estates	Brown	105	Community	Purchased surface water
13	Long Lake Colony	Brown	100	Community	Groundwater
14	Northwood First Subdivision	Brown	90	Community	Purchased surface water
15	Hutterville Colony South Dakota Inc.	Brown	90	Community	Groundwater
16	Westport Sanitary District	Brown	88	Community	Purchased surface water
17	Rolling Meadows	Brown	83	Community	Purchased surface water
18	The Meadows	Brown	80	Community	Purchased surface water
19	Richmond Heights Homeowners Associat	Brown	67	Community	Purchased surface water
20	Stratford	Brown	57	Community	Purchased surface water
21	Green Acres Association	Brown	55	Community	Purchased surface water

Also serving Brown County

These systems serve several counties, including Brown County. EPA lists another county first for them, so they are not included in the counts above.

Multi-county water systems that also serve Brown County, South Dakota
Water system	County	Population served	Type	Source
Web Water Development Association	Walworth + 9 more	20,750	Community	Surface water

Brown County water systems: frequently asked questions

How many public water systems are in Brown County, South Dakota?

EPA's SDWIS records file 21 active public water systems under Brown County, South Dakota: 21 community systems (100%). At least 1 more system is listed under another county but also serve Brown County.

Who supplies drinking water in Brown County, SD?

The largest community water systems filed under Brown County are Aberdeen (27,989 people served), Brown-Day-Marshall Rws (5,673 people served) and Groton (1,380 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Brown County's drinking water come from groundwater or surface water?

Of the 21 active public water systems in Brown County, 24% draw mainly on groundwater and 76% on surface water, counting purchased supplies. The largest system, Aberdeen, uses surface water.

Where can I find a water quality report for Brown County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 21 community systems are filed under Brown County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Brown County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More South Dakota water systems

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, “Public water systems in Brown County, South Dakota”, https://aquacensus.com/water-systems/south-dakota/brown (data as of October 1, 2026).