LYON-SIOUX RWS-BOYDEN

Iowa — Community Water System — PWSID: IA6000744

System Information

PWSID	IA6000744
System Name	LYON-SIOUX RWS-BOYDEN
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Private
EPA Region	07
Serves School	No
Wholesaler	No
First Reported	Feb 27, 1979
Last Reported	Dec 19, 2025

Location & Contact

State	Iowa
City	ROCK RAPIDS
ZIP Code	51246
Address	ATTN DAVE HARMSEN
Organization	LYON-SIOUX RURAL WATER SYSTEM
Phone	712-472-3755

Population & Service

Population Served	605
Service Connections	244

Drinking Water Violations (53)

This water system has 53 violations recorded in the EPA SDWIS database.

Begin Date	End Date	Contaminant	Category	Health-Based	Major	Measured	Federal MCL	State MCL	Status	Return to Compliance	Rule
Mar 1, 2001	Mar 31, 2001	Nitrate	MCL	Yes	No	11.7	10 mg/L	—	Resolved	Mar 31, 2001	Nitrate Rule
Mar 1, 2001	Mar 31, 2001	Nitrate	MCL	Yes	No	11.7	10 mg/L	—	Resolved	Mar 31, 2001	Nitrate Rule
Mar 1, 2001	Mar 31, 2001	Nitrate	MCL	Yes	No	11.7	10 mg/L	—	Resolved	Mar 31, 2001	Nitrate Rule
May 1, 2000	May 31, 2000	Nitrate	MCL	Yes	No	10.6	10 mg/L	—	Resolved	May 31, 2000	Nitrate Rule
May 1, 2000	May 31, 2000	Nitrate	MCL	Yes	No	10.6	10 mg/L	—	Resolved	May 31, 2000	Nitrate Rule
May 1, 2000	May 31, 2000	Nitrate	MCL	Yes	No	10.6	10 mg/L	—	Resolved	May 31, 2000	Nitrate Rule
May 1, 2000	May 31, 2000	Nitrate	MCL	Yes	No	10.6	10 mg/L	—	Resolved	May 31, 2000	Nitrate Rule
Feb 1, 1996	Feb 29, 1996	Nitrate	MCL	Yes	No	10.3	10 mg/L	—	Resolved	Feb 29, 1996	Nitrate Rule
Feb 1, 1996	Feb 29, 1996	Nitrate	MCL	Yes	No	10.3	10 mg/L	—	Resolved	Feb 29, 1996	Nitrate Rule
Feb 1, 1996	Feb 29, 1996	Nitrate	MCL	Yes	No	10.3	10 mg/L	—	Resolved	Feb 29, 1996	Nitrate Rule
Feb 1, 1996	Feb 29, 1996	Nitrate	MCL	Yes	No	10.3	10 mg/L	—	Resolved	Feb 29, 1996	Nitrate Rule
Nov 1, 1995	Nov 30, 1995	Nitrate	MCL	Yes	No	11.8	10 mg/L	—	Resolved	Nov 30, 1995	Nitrate Rule
Nov 1, 1995	Nov 30, 1995	Nitrate	MCL	Yes	No	11.8	10 mg/L	—	Resolved	Nov 30, 1995	Nitrate Rule
Nov 1, 1995	Nov 30, 1995	Nitrate	MCL	Yes	No	11.8	10 mg/L	—	Resolved	Nov 30, 1995	Nitrate Rule
Nov 1, 1995	Nov 30, 1995	Nitrate	MCL	Yes	No	11.8	10 mg/L	—	Resolved	Nov 30, 1995	Nitrate Rule
Nov 1, 1995	Nov 30, 1995	Nitrate	MCL	Yes	No	11.8	10 mg/L	—	Resolved	Nov 30, 1995	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Mar 1, 1994	Mar 31, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Mar 31, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Feb 1, 1994	Feb 28, 1994	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Feb 28, 1994	Nitrate Rule
Jan 1, 1993	Mar 31, 1993	Nitrate	MCL	Yes	No	7.56	10 mg/L	—	Resolved	Mar 31, 1993	Nitrate Rule
Jan 1, 1993	Mar 31, 1993	Nitrate	MCL	Yes	No	7.56	10 mg/L	—	Resolved	Mar 31, 1993	Nitrate Rule
Jan 1, 1993	Mar 31, 1993	Nitrate	MCL	Yes	No	7.56	10 mg/L	—	Resolved	Mar 31, 1993	Nitrate Rule
Jan 1, 1993	Mar 31, 1993	Nitrate	MCL	Yes	No	7.56	10 mg/L	—	Resolved	Mar 31, 1993	Nitrate Rule
Jan 1, 1987	Jan 31, 1987	Nitrate	Other	No	No	—	10 mg/L	—	Resolved	Jan 31, 1987	Nitrate Rule
Jan 1, 1987	Jan 31, 1987	Nitrate	Other	No	No	—	10 mg/L	—	Resolved	Jan 31, 1987	Nitrate Rule
Jan 1, 1987	Jan 31, 1987	Nitrate	Other	No	No	—	10 mg/L	—	Resolved	Jan 31, 1987	Nitrate Rule
Jan 1, 1987	Jan 31, 1987	Nitrate	Other	No	No	—	10 mg/L	—	Resolved	Jan 31, 1987	Nitrate Rule
Jan 1, 1987	Jan 31, 1987	Nitrate	Other	No	No	—	10 mg/L	—	Resolved	Jan 31, 1987	Nitrate Rule
Mar 1, 1986	Sep 30, 1986	Nitrate	MCL	Yes	No	11.11	10 mg/L	10	Resolved	Sep 30, 1986	Nitrate Rule
Mar 1, 1986	Sep 30, 1986	Nitrate	MCL	Yes	No	11.11	10 mg/L	10	Resolved	Sep 30, 1986	Nitrate Rule
Mar 1, 1986	Sep 30, 1986	Nitrate	MCL	Yes	No	11.11	10 mg/L	10	Resolved	Sep 30, 1986	Nitrate Rule
Mar 1, 1986	Sep 30, 1986	Nitrate	MCL	Yes	No	11.11	10 mg/L	10	Resolved	Sep 30, 1986	Nitrate Rule
Mar 1, 1986	Sep 30, 1986	Nitrate	MCL	Yes	No	11.11	10 mg/L	10	Resolved	Sep 30, 1986	Nitrate Rule
Feb 11, 1985	Mar 10, 1985	Nitrate	MCL	Yes	No	10.67	10 mg/L	10	Archived	Mar 10, 1985	Nitrate Rule
Feb 1, 1985	Mar 31, 1985	Nitrate	MCL	Yes	No	10.5	10 mg/L	10	Archived	Mar 31, 1985	Nitrate Rule
Jul 2, 1979	Dec 1, 1979	Nitrate	MCL	Yes	No	13.77	10 mg/L	10	Archived	Dec 1, 1979	Nitrate Rule
—	—		—	No	No	—	—	—	—	—	—

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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