Public water system · SD4602368
ActiveCuster-Mount Rushmore Koa-Front/Offi
At a glance
Custer-Mount Rushmore Koa-Front/Offi (PWSID SD4602368) is an active transient non-community water system in Custer County, South Dakota. It reports serving 25 people through 3 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
3
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Custer-Mount Rushmore Koa-Front/Offi compare with other water systems in Custer County?
By EPA's size categories, Custer-Mount Rushmore Koa-Front/Offi is a very small system (500 people or fewer). Custer County has 49 active public water systems. Its population served is well below the county average of 274 people per system, and accounts for 0.2% of the 13,414 people reported by systems filed under the county. Across South Dakota, the 699 active systems average 1,387 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Custer-Mount Rushmore Koa-Front/Offi is well below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. South Dakota has 173 active transient non-community water systems, 25% of the state's 699 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 431 South Dakota systems (62%) list groundwater as their primary source.
Who owns and regulates Custer-Mount Rushmore Koa-Front/Offi?
EPA lists Custer-Mount Rushmore Koa-Front/Offi as privately owned. The SD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 27 of the 49 active systems in Custer County (55%) are also privately owned.
Does Custer-Mount Rushmore Koa-Front/Offi have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Custer-Mount Rushmore Koa-Front/Offi. For the latest compliance status, check EPA ECHO for current compliance history.
Custer-Mount Rushmore Koa-Front/Offi: frequently asked questions
Who runs Custer-Mount Rushmore Koa-Front/Offi?
Custer-Mount Rushmore Koa-Front/Offi (PWSID SD4602368) is a transient non-community water system privately owned. It is regulated by the SD state drinking water program.
How many people does Custer-Mount Rushmore Koa-Front/Offi serve?
Custer-Mount Rushmore Koa-Front/Offi reports serving 25 people through 3 service connections in Custer County, South Dakota.
Where does Custer-Mount Rushmore Koa-Front/Offi get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Custer-Mount Rushmore Koa-Front/Offi have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Custer-Mount Rushmore Koa-Front/Offi's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult EPA ECHO, or the SD state drinking water program.
Where can I find Custer-Mount Rushmore Koa-Front/Offi's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Custer-Mount Rushmore Koa-Front/Offi is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Custer County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Laughing Water Restaurant at Crazy H | Custer | 2,055 | Non-transient non-community | Groundwater |
| Custer | Custer | 1,919 | Community | Groundwater |
| Nps-Wind Cave National Park | Custer | 1,404 | Non-transient non-community | Groundwater |
| Southern Black Hills Water | Custer + 1 more | 947 | Community | Groundwater |
| Csp-Sylvan Lake | Custer | 799 | Transient non-community | Groundwater |
| Csp-Game Lodge | Custer | 541 | Transient non-community | Groundwater |
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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, “Custer-Mount Rushmore Koa-Front/Offi, PWSID SD4602368, South Dakota”, https://aquacensus.com/water-systems/south-dakota/custer-mount-rushmore-koa-front-offi-sd4602368 (data as of October 1, 2026).