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Brookings County, South Dakota — public water systems

At a glance

12 active public water systems are filed under Brookings County, South Dakota in EPA's SDWIS records, together reporting 41,264 people served. The largest is Brookings Municipal Utilities, which reports serving 23,377 people. All 12 are community water systems serving people where they live.

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

Active systems

12

Population served

41.3K

Community systems

12

Groundwater share

100%

How does Brookings County compare with other South Dakota counties?

Brookings County has the 8th-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 41,264 people served in total, the 3rd-largest county figure in the state and 4.3% of the statewide total. The average system here reports serving 3,439 people, about 148% 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 Brookings County's drinking water come from?

By primary water source, Brookings County's active systems draw on purchased groundwater (6, 50%) and groundwater (6, 50%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 76% and 24% across South Dakota. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. The county's largest system, Brookings Municipal Utilities, draws primarily on groundwater.

What kinds of water systems operate in Brookings County?

Brookings County's active systems break down as 12 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 (58%) and local government (42%).

Water systems in Brookings County

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Active public water systems in Brookings County, South Dakota
#Water systemCountyPopulation servedTypeSource
1Brookings Municipal UtilitiesBrookings23,377CommunityGroundwater
2Kingbrook I Rural Water SystemBrookings6,455CommunityPurchased groundwater
3Brookings-Deuel Rural Water SystemBrookings + 1 more6,200CommunityGroundwater
4VolgaBrookings2,340CommunityGroundwater
5AuroraBrookings1,200CommunityPurchased groundwater
6ElktonBrookings755CommunityPurchased groundwater
7WhiteBrookings499CommunityPurchased groundwater
8University EstatesBrookings150CommunityPurchased groundwater
9Newdale ColonyBrookings119CommunityGroundwater
10Red Willow ColonyBrookings93CommunityGroundwater
11North Brookings Water and Sanitary DBrookings48CommunityPurchased groundwater
12Southbrook EstatesBrookings28CommunityGroundwater

Also serving Brookings County

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

Multi-county water systems that also serve Brookings County, South Dakota
Water systemCountyPopulation servedTypeSource
Big Sioux Community Water SystemMoody + 2 more5,800CommunityGroundwater

Brookings County water systems: frequently asked questions

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

EPA's SDWIS records file 12 active public water systems under Brookings County, South Dakota: 12 community systems (100%). At least 1 more system is listed under another county but also serve Brookings County.

Who supplies drinking water in Brookings County, SD?

The largest community water systems filed under Brookings County are Brookings Municipal Utilities (23,377 people served), Kingbrook I Rural Water System (6,455 people served) and Brookings-Deuel Rural Water System (6,200 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 Brookings County's drinking water come from groundwater or surface water?

Of the 12 active public water systems in Brookings County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Brookings Municipal Utilities, uses groundwater.

Where can I find a water quality report for Brookings 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. 12 community systems are filed under Brookings 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 Brookings 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 Brookings County, South Dakota”, https://aquacensus.com/water-systems/south-dakota/brookings (data as of October 1, 2026).