ROCK RAPIDS, IA · Lyon County

LYON-SIOUX RWS-BIG SIOUX 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 Iowa’s official records. Always confirm current status with Iowa before making decisions based on this information.

System facts

System ID (PWSID): IA6000755
System type: Community Water System
Population served: 1,530
Service connections: 612
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 2012 – June 30, 2021
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 2005 – December 31, 2013
Resolved
Monitoring, Regular
—
Cadmium
January 1, 2005 – December 31, 2013
Resolved
Monitoring, Regular
—
Mercury
January 1, 2005 – December 31, 2013
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
June 1, 2004 – August 14, 2007
Resolved
Monitoring, Regular
—
Nitrate
October 1, 1989 – December 31, 1989
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2012 – June 30, 2021	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2005 – December 31, 2013	Monitoring, Regular	Antimony, Total	—	Resolved
January 1, 2005 – December 31, 2013	Monitoring, Regular	Cadmium	—	Resolved
January 1, 2005 – December 31, 2013	Monitoring, Regular	Mercury	—	Resolved
June 1, 2004 – August 14, 2007	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 1, 1989 – December 31, 1989	Monitoring, Regular	Nitrate	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

August 8, 2022State Public Notification received1 linked violation
August 30, 2021State Compliance achieved1 linked violation
October 30, 2020State Public Notification received1 linked violation
October 21, 2020State Formal Notice of Violation issued1 linked violation
October 21, 2020State Public Notification requested1 linked violation
October 13, 2020State Compliance achieved1 linked violation
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification received1 linked violation
April 8, 2014State Public Notification received1 linked violation
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achievedgeneral compliance action — not tied to a specific violation on record
March 13, 2014State Compliance achieved1 linked violation
March 13, 2014State Compliance achieved1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Public Notification requested4 linked violations
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
February 18, 2014State Public Notification requested1 linked violation
February 18, 2014State Formal Notice of Violation issued1 linked violation
November 6, 2006State Public Notification requested5 linked violations
May 8, 2000State Public Notification received2 linked violations
April 18, 2000State Public Notification requested1 linked violation
April 18, 2000State Formal Notice of Violation issued1 linked violation
August 24, 1990State Formal Notice of Violation issued1 linked violation
August 24, 1990State Formal Notice of Violation issued3 linked violations
January 23, 1990State Compliance achieved1 linked violation
January 23, 1990State Compliance achieved1 linked violation
December 11, 1989State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
December 11, 1989State Formal Notice of Violation issued1 linked violation

Contact

LYON-SIOUX RURAL WATER SYSTEM

712-472-3755

ROCK RAPIDS, IA 51246