BLACK HAWK, SD · Lawrence County

OAK MOUNTAIN COUNTRY ESTATES Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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)

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
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
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2017 – March 31, 2017
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
Combined Radium (-226 and -228)
April 1, 2016 – June 30, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2016 – June 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
Gross Alpha, Excl. Radon and U
January 1, 2014 – March 31, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2013 – September 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
Gross Alpha, Excl. Radon and U
October 1, 2012 – December 31, 2012
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
October 1, 2010 – December 31, 2010
Resolved
Monitoring, Regular
—
Thallium, Total
June 30, 1998 – June 29, 1999
Resolved
Monitoring, Regular
—
Nickel
June 30, 1998 – June 29, 1999
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	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
January 1, 2017 – March 31, 2017	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	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
April 1, 2016 – June 30, 2016	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 2016 – June 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	Gross Alpha, Excl. Radon and U	Health-based	Resolved
July 1, 2013 – September 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
October 1, 2012 – December 31, 2012	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
October 1, 2010 – December 31, 2010	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
June 30, 1998 – June 29, 1999	Monitoring, Regular	Thallium, Total	—	Resolved
June 30, 1998 – June 29, 1999	Monitoring, Regular	Nickel	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

December 31, 2017State Compliance achieved16 linked violations
December 31, 2017State Compliance achieved7 linked violations
December 31, 2017State Compliance achieved1 linked violation
December 31, 2017State Compliance achieved4 linked violations
October 23, 2017State Public Notification received3 linked violations
May 1, 2017State Public Notification received3 linked violations
May 1, 2017State Public Notification received4 linked violations
December 29, 2016State Compliance achieved4 linked violations
December 27, 2016State Public Notification received4 linked violations
October 1, 2016State Compliance achieved2 linked violations
March 4, 2015State Public Notification requested2 linked violations
November 6, 2014State Public Notification received8 linked violations
October 23, 2014State Public Notification requested3 linked violations
September 24, 2014State Public Notification received8 linked violations
September 2, 2014State Public Notification requested7 linked violations
January 2, 2014State Public Notification requested24 linked violations
April 5, 2013State Public Notification received13 linked violations
January 7, 2013State Public Notification received9 linked violations
December 26, 2012State Administrative/Compliance Order without penalty issued15 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 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 issued16 linked violations
August 16, 2012State Compliance achieved5 linked violations
May 7, 2012State Public Notification received18 linked violations
September 26, 2002State Public Notification received5 linked violations
June 1, 2001State Compliance achieved3 linked violations
August 18, 1999State Compliance achieved13 linked violations

Contact

OAK MOUNTAIN COUNTRY ESTATES

6057864366

BLACK HAWK, SD 57718