OACOMA, SD · Lyman County
OACOMA Water System
Consumer Confidence Report status
OACOMA must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for OACOMA.
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)
- SD4600229
- System type
- Community Water System
- Population served
- 391
- Service connections
- 190
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
OACOMA is one of 583 community water systems in South Dakota in the 500 or fewer people size category, serving 391 people from surface water.
As of August 1, 2026, its federal record holds 3 entries between 1976 and 2011, all of which EPA lists as closed. Nothing has been added since 2011.
Of the 3, 2 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 Groundwater Rule.
Violation history
Sanitary Survey (TCR)
—No contaminant on record
June 25, 2011 – April 4, 2012
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
July 1, 1976 – June 30, 1980
ArchivedMonitoring, 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)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| June 25, 2011 – April 4, 2012 | Sanitary Survey (TCR) | — | — | Resolved |
| July 1, 1976 – June 30, 1980 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
| July 1, 1976 – June 30, 1980 | Monitoring, Regular | Combined Radium (-226 and -228) | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- July 6, 2012State Public Notification requested73 linked violations
Common questions
Is OACOMA required to publish a Consumer Confidence Report?
- Yes. OACOMA is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is OACOMA’s next Consumer Confidence Report due?
- OACOMA’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does OACOMA have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for OACOMA.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
OACOMA
6057344455
OACOMA, SD 57365