Is OAK MOUNTAIN COUNTRY ESTATES required to publish a Consumer Confidence Report?

Yes. OAK MOUNTAIN COUNTRY ESTATES 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 OAK MOUNTAIN COUNTRY ESTATES’s next Consumer Confidence Report due?

OAK MOUNTAIN COUNTRY ESTATES’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

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.

BLACK HAWK, SD · Lawrence County

OAK MOUNTAIN COUNTRY ESTATES Water System

Consumer Confidence Report status

OAK MOUNTAIN COUNTRY ESTATES 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 OAK MOUNTAIN COUNTRY ESTATES.

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): SD4602151
System type: Community Water System
Population served: 85
Service connections: 34
Ownership: privately owned
Water source: groundwater (wells)

OAK MOUNTAIN COUNTRY ESTATES is one of 583 community water systems in South Dakota in the 500 or fewer people size category, serving 85 people from groundwater.

As of August 1, 2026, its federal record holds 21 entries between 1993 and 2017, all of which EPA lists as closed. Nothing has been added since 2017.

Of the 21, 5 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, the Stage 1 Disinfectants and Disinfection Byproducts Rule, and inorganic chemicals.

Violation history

Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
July 1, 2017 – September 30, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2017 – June 30, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2017 – June 30, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2017 – March 31, 2017
Resolved
Treatment Technique No Certif. Operator
Health-based
Stage 1 Disinfectants and Disinfection Byproducts Rule
August 1, 2016 – September 20, 2016
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
August 1, 2016 – August 31, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2016 – September 30, 2016
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
July 1, 2016 – September 30, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
July 1, 2016 – September 30, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
July 1, 2014 – September 30, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2014 – June 30, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2014 – March 31, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2013 – June 30, 2013
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2013 – March 31, 2013
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2012 – September 30, 2012
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2012 – March 31, 2012
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
October 1, 2011 – December 31, 2011
Resolved
Treatment Technique No Certif. Operator
Health-based
Stage 1 Disinfectants and Disinfection Byproducts Rule
May 1, 2011 – September 29, 2011
Resolved
Monitoring, Regular
—
Barium
June 30, 1998 – June 29, 1999
Resolved
Monitoring, Regular
—
Selenium
June 30, 1998 – June 29, 1999
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 1993 – December 31, 1995
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2017 – September 30, 2017	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
April 1, 2017 – June 30, 2017	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 2017 – June 30, 2017	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
January 1, 2017 – March 31, 2017	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
August 1, 2016 – September 20, 2016	Treatment Technique No Certif. Operator	Stage 1 Disinfectants and Disinfection Byproducts Rule	Health-based	Resolved
August 1, 2016 – August 31, 2016	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2016 – September 30, 2016	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2016 – September 30, 2016	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
July 1, 2016 – September 30, 2016	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
July 1, 2014 – September 30, 2014	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
April 1, 2014 – June 30, 2014	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
January 1, 2014 – March 31, 2014	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 2013 – June 30, 2013	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2013 – March 31, 2013	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
July 1, 2012 – September 30, 2012	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2012 – March 31, 2012	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
October 1, 2011 – December 31, 2011	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
May 1, 2011 – September 29, 2011	Treatment Technique No Certif. Operator	Stage 1 Disinfectants and Disinfection Byproducts Rule	Health-based	Resolved
June 30, 1998 – June 29, 1999	Monitoring, Regular	Barium	—	Resolved
June 30, 1998 – June 29, 1999	Monitoring, Regular	Selenium	—	Resolved
January 1, 1993 – December 31, 1995	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

December 31, 2017State Compliance achieved4 linked violations
December 31, 2017State Compliance achieved7 linked violations
December 31, 2017State Compliance achieved7 linked violations
December 31, 2017State Compliance achieved5 linked violations
December 31, 2017State Compliance achieved7 linked violations
December 31, 2017State Compliance achieved2 linked violations
December 31, 2017State Compliance achieved1 linked violation
December 31, 2017State Compliance achieved4 linked violations
December 31, 2017State Compliance achieved4 linked violations
October 23, 2017State Public Notification received3 linked violations
June 7, 2017State Public Notification received4 linked violations
May 1, 2017State Public Notification received3 linked violations
December 29, 2016State Compliance achieved4 linked violations
November 30, 2016State Public Notification requested6 linked violations
April 6, 2016State Public Notification received7 linked violations
March 4, 2015State Public Notification requested2 linked violations
October 23, 2014State Public Notification requested4 linked violations
October 23, 2014State Public Notification requested3 linked violations
September 2, 2014State Public Notification requested7 linked violations
September 19, 2013State Public Notification received13 linked violations
January 7, 2013State Compliance achieved14 linked violations
December 26, 2012State Administrative/Compliance Order without penalty issued4 linked violations
December 26, 2012State Administrative/Compliance Order without penalty issued8 linked violations
December 26, 2012State Administrative/Compliance Order without penalty issued4 linked violations
December 26, 2012State Administrative/Compliance Order without penalty issued4 linked violations
December 26, 2012State Administrative/Compliance Order without penalty issued4 linked violations
December 26, 2012State Administrative/Compliance Order without penalty issued3 linked violations
December 16, 2012State Administrative/Compliance Order without penalty issued6 linked violations
December 16, 2012State Administrative/Compliance Order without penalty issued7 linked violations
August 16, 2012State Compliance achieved5 linked violations
May 7, 2012State Public Notification received18 linked violations
April 9, 2012State Public Notification requested35 linked violations
April 9, 2012State Public Notification requested38 linked violations
September 26, 2002State Public Notification received5 linked violations
June 1, 2001State Compliance achieved3 linked violations
September 28, 2000State Compliance achieved4 linked violations
August 18, 1999State Compliance achieved13 linked violations

Common questions

Is OAK MOUNTAIN COUNTRY ESTATES required to publish a Consumer Confidence Report?: Yes. OAK MOUNTAIN COUNTRY ESTATES 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 OAK MOUNTAIN COUNTRY ESTATES’s next Consumer Confidence Report due?: OAK MOUNTAIN COUNTRY ESTATES’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does OAK MOUNTAIN COUNTRY ESTATES have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for OAK MOUNTAIN COUNTRY ESTATES.
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

OAK MOUNTAIN COUNTRY ESTATES

6057864366

BLACK HAWK, SD 57718