ROCK RAPIDS, IA · Lyon County

LYON-SIOUX RWS-BOYDEN 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): IA6000744
System type: Community Water System
Population served: 605
Service connections: 244
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
March 1, 2001 – March 31, 2001
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 1993 – March 31, 1993
Resolved
Notification, Public
—
Nitrate
January 1, 1987 – January 31, 1987
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Nitrate
March 1, 1986 – September 30, 1986
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 11, 1985 – March 10, 1985
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 1, 1985 – March 31, 1985
Archived
Maximum Contaminant Level Violation, Average
Health-based
Nitrate
July 2, 1979 – December 1, 1979
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
March 1, 2001 – March 31, 2001	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Resolved
January 1, 1993 – March 31, 1993	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Resolved
January 1, 1987 – January 31, 1987	Notification, Public	Nitrate	—	Resolved
March 1, 1986 – September 30, 1986	Maximum Contaminant Level Violation, Average	Nitrate	Health-based	Resolved
February 11, 1985 – March 10, 1985	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
February 1, 1985 – March 31, 1985	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 2, 1979 – December 1, 1979	Maximum Contaminant Level Violation, Average	Nitrate	Health-based	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

September 19, 2001State Compliance achieved4 linked violations
May 19, 2000State Public Notification requested4 linked violations
August 12, 1996State Compliance achieved7 linked violations
November 30, 1994State Compliance achieved6 linked violations
May 25, 1994State Public Notification received9 linked violations
October 9, 1989State Compliance achieved1 linked violation

Contact

LYON-SIOUX RURAL WATER SYSTEM

712-472-3755

ROCK RAPIDS, IA 51246