Public water system · SD4600780
ActiveCsp-Sylvan Lake
At a glance
Csp-Sylvan Lake (PWSID SD4600780) is an active transient non-community water system in Custer County, South Dakota. It reports serving 799 people through 54 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
799
Service connections
54
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Csp-Sylvan Lake compare with other water systems in Custer County?
By EPA's size categories, Csp-Sylvan Lake is a small system (501 to 3,300 people). Custer County has 49 active public water systems, and Csp-Sylvan Lake is the 5th-largest of them by population served. Its population served is about 192% above the county average of 274 people per system, and accounts for 6% 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 Csp-Sylvan Lake is about 5.6 times 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 Csp-Sylvan Lake?
EPA lists Csp-Sylvan Lake as owned by a state government. 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. 12 of the 49 active systems in Custer County (24%) are also owned by a state government.
Does Csp-Sylvan Lake 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 Csp-Sylvan Lake. For the latest compliance status, check EPA ECHO for current compliance history.
Csp-Sylvan Lake: frequently asked questions
Who runs Csp-Sylvan Lake?
Csp-Sylvan Lake (PWSID SD4600780) is a transient non-community water system owned by a state government. It is regulated by the SD state drinking water program.
How many people does Csp-Sylvan Lake serve?
Csp-Sylvan Lake reports serving 799 people through 54 service connections in Custer County, South Dakota.
Where does Csp-Sylvan Lake 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 Csp-Sylvan Lake have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Csp-Sylvan Lake'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 Csp-Sylvan Lake's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Csp-Sylvan Lake 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-Game Lodge | Custer | 541 | Transient non-community | Groundwater |
| Black Hawk Oil Company | Custer | 500 | 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, “Csp-Sylvan Lake, PWSID SD4600780, South Dakota”, https://aquacensus.com/water-systems/south-dakota/csp-sylvan-lake-sd4600780 (data as of October 1, 2026).