Stanley County, South Dakota — public water systems
At a glance
3 active public water systems are filed under Stanley County, South Dakota in EPA's SDWIS records, together reporting 9,448 people served. The largest is Wr/Lj - Mni Wiconi, which reports serving 4,720 people. All 3 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
3
Population served
9.4K
Community systems
3
Groundwater share
0%
How does Stanley County compare with other South Dakota counties?
Stanley County has the 46th-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 9,448 people served in total, the 20th-largest county figure in the state and 1% of the statewide total. The average system here reports serving 3,149 people, about 127% 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 Stanley County's drinking water come from?
By primary water source, Stanley County's active systems draw on purchased surface water (3, 100%). Overall, none rely mainly on groundwater (including purchased groundwater) and all 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, Wr/Lj - Mni Wiconi, draws primarily on purchased surface water.
What kinds of water systems operate in Stanley County?
Stanley County's active systems break down as 3 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 (67%) and local government (33%).
Water systems in Stanley County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Wr/Lj - Mni Wiconi | Stanley + 2 more | 4,720 | Community | Purchased surface water |
| 2 | Wr/Lj - North Stanley County | Stanley | 2,492 | Community | Purchased surface water |
| 3 | Fort Pierre | Stanley | 2,236 | Community | Purchased surface water |
Stanley County water systems: frequently asked questions
How many public water systems are in Stanley County, South Dakota?
EPA's SDWIS records file 3 active public water systems under Stanley County, South Dakota: 3 community systems (100%).
Who supplies drinking water in Stanley County, SD?
The largest community water systems filed under Stanley County are Wr/Lj - Mni Wiconi (4,720 people served), Wr/Lj - North Stanley County (2,492 people served) and Fort Pierre (2,236 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 Stanley County's drinking water come from groundwater or surface water?
Of the 3 active public water systems in Stanley County, none draw mainly on groundwater and all on surface water, counting purchased supplies. The largest system, Wr/Lj - Mni Wiconi, uses purchased surface water.
Where can I find a water quality report for Stanley 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. 3 community systems are filed under Stanley 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 Stanley 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 Stanley County, South Dakota”, https://aquacensus.com/water-systems/south-dakota/stanley (data as of October 1, 2026).