PIEDMONT, SD · Pennington County

RAINBOW WATER COMPANY Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of September 1, 2017. 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 Pennington 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): SD4602216
System type: Community Water System
Population served: 258
Service connections: 103
Ownership: privately owned
Water source: groundwater (wells)

RAINBOW WATER COMPANY is one of 583 community water systems in South Dakota in the 500 or fewer people size category, formerly serving 258 people from groundwater.

EPA's federal records list this system as inactive in 2017; the record below is historical.

As of August 1, 2026, its federal record holds 32 entries between 2002 and 2017, all of which EPA lists as closed. Nothing has been added since 2017.

Of the 32, 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, the Public Notice Rule and Revised PN Rule, and volatile organic chemicals.

Violation history

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
Combined Radium (-226 and -228)
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
January 1, 2016 – March 31, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2016 – March 31, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2015 – September 30, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2015 – June 30, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
October 1, 2014 – December 31, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2014 – September 30, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
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)
April 1, 2013 – June 30, 2013
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
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
January 1, 2012 – March 31, 2012
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
April 3, 2011 – June 8, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2011 – June 30, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2011 – June 30, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2011 – March 31, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2010 – September 30, 2010
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2009 – September 30, 2009
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2007 – March 31, 2007
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
October 3, 2006 – December 27, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2006 – October 10, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2006 – June 30, 2006
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
January 7, 2006 – December 27, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2006 – March 31, 2006
Resolved
Monitoring, Regular
—
Carbon tetrachloride
October 1, 2002 – December 31, 2002
Resolved
Monitoring, Regular
—
Tetrachloroethylene
October 1, 2002 – December 31, 2002
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2017 – March 31, 2017	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	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	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
January 1, 2016 – March 31, 2016	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
January 1, 2016 – March 31, 2016	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2015 – September 30, 2015	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 2015 – June 30, 2015	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
October 1, 2014 – December 31, 2014	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2014 – September 30, 2014	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 2014 – June 30, 2014	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2014 – March 31, 2014	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	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	Combined Radium (-226 and -228)	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
January 1, 2012 – March 31, 2012	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
April 3, 2011 – June 8, 2011	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 1, 2011 – June 30, 2011	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
April 1, 2011 – June 30, 2011	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2011 – March 31, 2011	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2010 – September 30, 2010	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2009 – September 30, 2009	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2007 – March 31, 2007	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
October 3, 2006 – December 27, 2007	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
July 1, 2006 – October 10, 2006	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
April 1, 2006 – June 30, 2006	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
January 7, 2006 – December 27, 2007	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
January 1, 2006 – March 31, 2006	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
October 1, 2002 – December 31, 2002	Monitoring, Regular	Carbon tetrachloride	—	Resolved
October 1, 2002 – December 31, 2002	Monitoring, Regular	Tetrachloroethylene	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved2 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved3 linked violations
September 6, 2017State Compliance achieved3 linked violations
September 6, 2017State Compliance achieved2 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved3 linked violations
September 6, 2017State Compliance achieved4 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved5 linked violations
September 6, 2017State Compliance achieved4 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved3 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved5 linked violations
September 6, 2017State Compliance achieved9 linked violations
September 6, 2017State Compliance achieved9 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved2 linked violations
September 6, 2017State Compliance achieved2 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved3 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved2 linked violations
September 6, 2017State Compliance achieved5 linked violations
September 6, 2017State Compliance achieved3 linked violations
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
September 6, 2017State Compliance achieved1 linked violation
June 22, 2017State Public Notification received3 linked violations
December 26, 2016State Public Notification received3 linked violations
November 14, 2016State Public Notification requested3 linked violations
September 8, 2016State Public Notification received3 linked violations
June 9, 2016State Public Notification received2 linked violations
May 16, 2016State Public Notification requested2 linked violations
March 10, 2016State Public Notification received3 linked violations
January 25, 2016State Public Notification requested1 linked violation
December 14, 2015State Public Notification received1 linked violation
September 14, 2015State Public Notification received7 linked violations
March 31, 2015State Compliance achieved2 linked violations
March 10, 2015State Public Notification received2 linked violations
February 2, 2015State Public Notification requested3 linked violations
September 15, 2014State Public Notification received2 linked violations
September 15, 2014State Public Notification received2 linked violations
July 21, 2014State Public Notification requested2 linked violations
July 1, 2014State Public Notification received2 linked violations
March 27, 2014State Public Notification received2 linked violations
March 4, 2014State Violation/Reminder Notice2 linked violations
September 17, 2013State Public Notification received3 linked violations
February 13, 2013State Administrative/Compliance Order without penalty issued3 linked violations
February 13, 2013State Administrative/Compliance Order without penalty issued2 linked violations
February 13, 2013State Administrative/Compliance Order without penalty issued16 linked violations
February 13, 2013State Administrative/Compliance Order without penalty issued5 linked violations
February 13, 2013State Administrative/Compliance Order without penalty issued2 linked violations
November 27, 2012State Public Notification requested8 linked violations
June 18, 2012State Public Notification received6 linked violations
June 5, 2012State Public Notification received11 linked violations
March 13, 2012State Public Notification received10 linked violations
April 25, 2011State Public Notification requested13 linked violations
November 18, 2010State Public Notification requested7 linked violations
November 18, 2010State Public Notification requested7 linked violations
July 12, 2010State Public Notification requested6 linked violations
August 7, 2009State Public Notification received8 linked violations
February 2, 2009State Public Notification requested12 linked violations
December 29, 2008State Public Notification received8 linked violations
February 5, 2008State Public Notification requested47 linked violations
December 27, 2007State Public Notification received9 linked violations
February 13, 2006State Administrative/Compliance Order without penalty issued3 linked violations
February 13, 2006State Administrative/Compliance Order without penalty issued3 linked violations
February 13, 2006State Administrative/Compliance Order with penalty issued5 linked violations
February 13, 2006State Administrative/Compliance Order with penalty issued6 linked violations
February 13, 2006State Administrative/Compliance Order without penalty issued4 linked violations
February 13, 2006State Administrative/Compliance Order with penalty issued21 linked violations
February 13, 2006State Administrative/Compliance Order without penalty issued4 linked violations
February 13, 2006State Administrative/Compliance Order without penalty issued2 linked violations
February 13, 2006State Administrative/Compliance Order without penalty issued3 linked violations
February 13, 2006State Administrative/Compliance Order with penalty issued2 linked violations
February 13, 2006State Administrative/Compliance Order with penalty issued16 linked violations
February 5, 2003State Compliance achieved94 linked violations
February 4, 2003State Public Notification received137 linked violations

Last known contact on file (system is inactive)

RAINBOW WATER COMPANY

Phone not on record

PIEDMONT, SD 57769