McCook County, South Dakota — public water systems
At a glance
6 active public water systems are filed under McCook County, South Dakota in EPA's SDWIS records, together reporting 7,366 people served. The largest is Tm Rural Water District, which reports serving 4,250 people. All 6 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
6
Population served
7.4K
Community systems
6
Groundwater share
50%
How does McCook County compare with other South Dakota counties?
McCook County has the 24th-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 7,366 people served in total, the 25th-largest county figure in the state and 0.8% of the statewide total. The average system here reports serving 1,228 people, about 11% 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 McCook County's drinking water come from?
By primary water source, McCook County's active systems draw on purchased surface water (3, 50%), purchased groundwater (2, 33%) and groundwater (1, 17%). Overall, 50% rely mainly on groundwater (including purchased groundwater) and 50% 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, Tm Rural Water District, draws primarily on purchased surface water.
What kinds of water systems operate in McCook County?
McCook County's active systems break down as 6 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 McCook County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Tm Rural Water District | McCook + 1 more | 4,250 | Community | Purchased surface water |
| 2 | Salem | McCook | 1,325 | Community | Groundwater |
| 3 | Canistota | McCook | 642 | Community | Purchased groundwater |
| 4 | Bridgewater | McCook | 511 | Community | Purchased surface water |
| 5 | Montrose | McCook | 468 | Community | Purchased groundwater |
| 6 | Spencer | McCook | 170 | Community | Purchased surface water |
Also serving McCook County
These systems serve several counties, including McCook County. EPA lists another county first for them, so they are not included in the counts above.
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Minnehaha Community Water Corp | Minnehaha + 2 more | 13,435 | Community | Groundwater |
| By Water District | Bon Homme + 6 more | 13,320 | Community | Surface water |
| Hanson Rural Water System | Hanson + 2 more | 2,685 | Community | Purchased surface water |
McCook County water systems: frequently asked questions
How many public water systems are in McCook County, South Dakota?
EPA's SDWIS records file 6 active public water systems under McCook County, South Dakota: 6 community systems (100%). At least 3 more systems are listed under another county but also serve McCook County.
Who supplies drinking water in McCook County, SD?
The largest community water systems filed under McCook County are Tm Rural Water District (4,250 people served), Salem (1,325 people served) and Canistota (642 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 McCook County's drinking water come from groundwater or surface water?
Of the 6 active public water systems in McCook County, 50% draw mainly on groundwater and 50% on surface water, counting purchased supplies. The largest system, Tm Rural Water District, uses purchased surface water.
Where can I find a water quality report for McCook 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. 6 community systems are filed under McCook 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 McCook 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 McCook County, South Dakota”, https://aquacensus.com/water-systems/south-dakota/mccook (data as of October 1, 2026).