Douglas County, South Dakota — public water systems
At a glance
5 active public water systems are filed under Douglas County, South Dakota in EPA's SDWIS records, together reporting 1,617 people served. The largest is Armour, which reports serving 698 people. All 5 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
5
Population served
1.6K
Community systems
5
Groundwater share
40%
How does Douglas County compare with other South Dakota counties?
Douglas County has the 32nd-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 1,617 people served in total, the 43rd-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 323 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 Douglas County's drinking water come from?
By primary water source, Douglas County's active systems draw on purchased surface water (3, 60%) and groundwater (2, 40%). Overall, 40% rely mainly on groundwater (including purchased groundwater) and 60% 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, Armour, draws primarily on purchased surface water.
What kinds of water systems operate in Douglas County?
Douglas County's active systems break down as 5 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 (60%) and private (40%).
Water systems in Douglas County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Armour | Douglas | 698 | Community | Purchased surface water |
| 2 | Corsica | Douglas | 561 | Community | Purchased surface water |
| 3 | Delmont | Douglas | 153 | Community | Purchased surface water |
| 4 | Clearfield Colony | Douglas | 120 | Community | Groundwater |
| 5 | Greenwood Colony | Douglas | 85 | Community | Groundwater |
Also serving Douglas County
These systems serve several counties, including Douglas County. EPA lists another county first for them, so they are not included in the counts above.
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| By Water District | Bon Homme + 6 more | 13,320 | Community | Surface water |
| Davison Rural Water System Inc. | Davison + 4 more | 3,485 | Community | Purchased surface water |
| Aurora-Brule Rural Water System | Aurora + 5 more | 2,750 | Community | Surface water |
Douglas County water systems: frequently asked questions
How many public water systems are in Douglas County, South Dakota?
EPA's SDWIS records file 5 active public water systems under Douglas County, South Dakota: 5 community systems (100%). At least 3 more systems are listed under another county but also serve Douglas County.
Who supplies drinking water in Douglas County, SD?
The largest community water systems filed under Douglas County are Armour (698 people served), Corsica (561 people served) and Delmont (153 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 Douglas County's drinking water come from groundwater or surface water?
Of the 5 active public water systems in Douglas County, 40% draw mainly on groundwater and 60% on surface water, counting purchased supplies. The largest system, Armour, uses purchased surface water.
Where can I find a water quality report for Douglas 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. 5 community systems are filed under Douglas 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 Douglas 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 Douglas County, South Dakota”, https://aquacensus.com/water-systems/south-dakota/douglas (data as of October 1, 2026).