Lyman County, South Dakota — public water systems
At a glance
3 active public water systems are filed under Lyman County, South Dakota in EPA's SDWIS records, together reporting 1,128 people served. The largest is Presho, which reports serving 472 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
1.1K
Community systems
3
Groundwater share
0%
How does Lyman County compare with other South Dakota counties?
Lyman County has the 47th-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 1,128 people served in total, the 52nd-largest county figure in the state and 0.1% of the statewide total. The average system here reports serving 376 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 Lyman County's drinking water come from?
By primary water source, Lyman County's active systems draw on purchased surface water (2, 67%) and surface water (1, 33%). 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, Presho, draws primarily on purchased surface water.
What kinds of water systems operate in Lyman County?
Lyman 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 local government (100%).
Water systems in Lyman County
🔒 Create a free account to export CSVAlso serving Lyman County
These systems serve several counties, including Lyman County. EPA lists another county first for them, so they are not included in the counts above.
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Tripp County Water User District | Tripp + 4 more | 4,860 | Community | Groundwater |
| Wr/Lj - Mni Wiconi | Stanley + 2 more | 4,720 | Community | Purchased surface water |
Lyman County water systems: frequently asked questions
How many public water systems are in Lyman County, South Dakota?
EPA's SDWIS records file 3 active public water systems under Lyman County, South Dakota: 3 community systems (100%). At least 2 more systems are listed under another county but also serve Lyman County.
Who supplies drinking water in Lyman County, SD?
The largest community water systems filed under Lyman County are Presho (472 people served), Oacoma (391 people served) and Kennebec (265 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 Lyman County's drinking water come from groundwater or surface water?
Of the 3 active public water systems in Lyman County, none draw mainly on groundwater and all on surface water, counting purchased supplies. The largest system, Presho, uses purchased surface water.
Where can I find a water quality report for Lyman 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 Lyman 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 Lyman 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 Lyman County, South Dakota”, https://aquacensus.com/water-systems/south-dakota/lyman (data as of October 1, 2026).