Public Water Partners

CUSTER, SD · Custer County

CUSTER DOC Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of October 1, 2020. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in Custer County, SD.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace South Dakota’s official records. Always confirm current status with South Dakota before making decisions based on this information.

System facts

System ID (PWSID)
SD4600384
System type
Community Water System
Population served
25
Service connections
30
Ownership
privately owned
Water source
surface water (rivers, lakes, or reservoirs)

CUSTER DOC is one of 583 community water systems in South Dakota in the 500 or fewer people size category, formerly serving 25 people from surface water.

EPA's federal records list this system as inactive in 2020; the record below is historical.

As of August 1, 2026, its federal record holds 3 entries between 1976 and 2018, all of which EPA lists as closed. Nothing has been added since 2018.

All 3 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Radionuclides and Revised Rad Rule and the Stage 1 Disinfectants and Disinfection Byproducts Rule.

Violation history

  • Monitoring and Reporting (DBP)

    —

    Chlorine

    July 1, 2018 – September 30, 2018

    Resolved

  • Monitoring, Regular

    —

    Gross Alpha, Excl. Radon and U

    July 1, 1976 – June 30, 1980

    Archived

  • Monitoring, Regular

    —

    Combined Radium (-226 and -228)

    July 1, 1976 – June 30, 1980

    Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

No enforcement actions on record for this system.

Last known contact on file (system is inactive)

CUSTER DOC

6056733003

CUSTER, SD 57730