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Marshall County, South Dakota — public water systems

At a glance

7 active public water systems are filed under Marshall County, South Dakota in EPA's SDWIS records, together reporting 2,134 people served. The largest is Britton, which reports serving 1,215 people. All 7 are community water systems serving people where they live.

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

Active systems

7

Population served

2.1K

Community systems

7

Groundwater share

85.7%

How does Marshall County compare with other South Dakota counties?

Marshall County has the 15th-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 2,134 people served in total, the 41st-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 305 people, well below 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 Marshall County's drinking water come from?

By primary water source, Marshall County's active systems draw on purchased groundwater (5, 71%), purchased surface water (1, 14%) and groundwater (1, 14%). Overall, 86% rely mainly on groundwater (including purchased groundwater) and 14% 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, Britton, draws primarily on purchased groundwater.

What kinds of water systems operate in Marshall County?

Marshall County's active systems break down as 7 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 local government (71%) and private (29%).

Water systems in Marshall County

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Active public water systems in Marshall County, South Dakota
#Water systemCountyPopulation servedTypeSource
1BrittonMarshall1,215CommunityPurchased groundwater
2VeblenMarshall317CommunityPurchased groundwater
3LangfordMarshall283CommunityPurchased groundwater
4Sunset ColonyMarshall140CommunityGroundwater
5EdenMarshall94CommunityPurchased surface water
6Lake CityMarshall45CommunityPurchased groundwater
7Amherst Water CompanyMarshall40CommunityPurchased groundwater

Also serving Marshall County

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

Multi-county water systems that also serve Marshall County, South Dakota
Water systemCountyPopulation servedTypeSource
Web Water Development AssociationWalworth + 9 more20,750CommunitySurface water
Brown-Day-Marshall RwsBrown + 2 more5,673CommunityGroundwater

Marshall County water systems: frequently asked questions

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

EPA's SDWIS records file 7 active public water systems under Marshall County, South Dakota: 7 community systems (100%). At least 2 more systems are listed under another county but also serve Marshall County.

Who supplies drinking water in Marshall County, SD?

The largest community water systems filed under Marshall County are Britton (1,215 people served), Veblen (317 people served) and Langford (283 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 Marshall County's drinking water come from groundwater or surface water?

Of the 7 active public water systems in Marshall County, 86% draw mainly on groundwater and 14% on surface water, counting purchased supplies. The largest system, Britton, uses purchased groundwater.

Where can I find a water quality report for Marshall 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. 7 community systems are filed under Marshall 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 Marshall 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 Marshall County, South Dakota”, https://aquacensus.com/water-systems/south-dakota/marshall (data as of October 1, 2026).