ONSLOW WATER SUPPLY

Iowa — Community Water System — PWSID: IA5358096

System Information

PWSID	IA5358096
System Name	ONSLOW WATER SUPPLY
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Local
EPA Region	07
Serves School	No
Wholesaler	No
First Reported	Feb 27, 1979
Last Reported	Dec 19, 2025

Location & Contact

State	Iowa
City	WYOMING
ZIP Code	52362
Address	ATTN RODNEY GRAVEL OPERATOR
Organization	ONSLOW WATER SUPPLY
Phone	319-821-0124

Population & Service

Population Served	201
Service Connections	110

Drinking Water Violations (102)

This water system has 102 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
Jan 1, 2022	Dec 31, 2022	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2022	Nitrate Rule
Jan 1, 2022	Dec 31, 2022	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2022	Nitrate Rule
Jan 1, 2022	Dec 31, 2022	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2022	Nitrate Rule
Jan 1, 2022	Dec 31, 2022	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2022	Nitrate Rule
Jul 1, 2019	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 3, 2019	Consumer Confidence Rule
Jul 1, 2019	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 3, 2019	Consumer Confidence Rule
Jul 1, 2019	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 3, 2019	Consumer Confidence Rule
Jul 1, 2017	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 27, 2017	Consumer Confidence Rule
Jul 1, 2017	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 27, 2017	Consumer Confidence Rule
Jul 1, 2017	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 27, 2017	Consumer Confidence Rule
Jul 1, 2017	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 27, 2017	Consumer Confidence Rule
Jul 1, 2013	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 23, 2013	Consumer Confidence Rule
Jul 1, 2013	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 23, 2013	Consumer Confidence Rule
Jul 1, 2013	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 23, 2013	Consumer Confidence Rule
Jun 1, 2012	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Aug 31, 2015	Lead and Copper Rule
Jun 1, 2012	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Aug 31, 2015	Lead and Copper Rule
Jun 1, 2012	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Aug 31, 2015	Lead and Copper Rule
Jun 1, 2012	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Aug 31, 2015	Lead and Copper Rule
Jul 1, 2002	Jul 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jul 31, 2002	Total Coliform Rule
Jul 1, 2002	Jul 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jul 31, 2002	Total Coliform Rule
Jul 1, 2002	Jul 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jul 31, 2002	Total Coliform Rule
Jul 1, 2000	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	May 23, 2001	Consumer Confidence Rule
Jul 1, 2000	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	May 23, 2001	Consumer Confidence Rule
Jul 1, 2000	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	May 23, 2001	Consumer Confidence Rule
Jul 1, 2000	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	May 23, 2001	Consumer Confidence Rule
Oct 1, 1999	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 21, 2000	Lead and Copper Rule
Oct 1, 1999	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 21, 2000	Lead and Copper Rule
Oct 1, 1999	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 21, 2000	Lead and Copper Rule
Apr 1, 1996	Jun 30, 1996	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 1996	Nitrate Rule
Apr 1, 1996	Jun 30, 1996	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 1996	Nitrate Rule
Apr 1, 1996	Jun 30, 1996	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 1996	Nitrate Rule
Apr 1, 1996	Apr 30, 1996	1,2,4-Trichlorobenzene	MR	No	Yes	—	0.07 mg/L	—	Resolved	Apr 30, 1996	Volatile Organic Chemicals
Apr 1, 1996	Apr 30, 1996	1,2,4-Trichlorobenzene	MR	No	Yes	—	0.07 mg/L	—	Resolved	Apr 30, 1996	Volatile Organic Chemicals
Apr 1, 1996	Apr 30, 1996	1,2,4-Trichlorobenzene	MR	No	Yes	—	0.07 mg/L	—	Resolved	Apr 30, 1996	Volatile Organic Chemicals
Apr 1, 1995	Jun 30, 1995	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 1995	Nitrate Rule
Apr 1, 1995	Jun 30, 1995	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 1995	Nitrate Rule
Apr 1, 1995	Jun 30, 1995	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 1995	Nitrate Rule
Apr 1, 1995	Apr 30, 1995	BHC-GAMMA	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Apr 30, 1995	Synthetic Organic Chemicals
Apr 1, 1995	Apr 30, 1995	BHC-GAMMA	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Apr 30, 1995	Synthetic Organic Chemicals
Apr 1, 1995	Apr 30, 1995	BHC-GAMMA	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Apr 30, 1995	Synthetic Organic Chemicals
Oct 1, 1989	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 26, 1990	Lead and Copper Rule
Oct 1, 1989	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 26, 1990	Lead and Copper Rule
Oct 1, 1989	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 26, 1990	Lead and Copper Rule
Oct 1, 1989	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 26, 1990	Lead and Copper Rule
Oct 1, 1989	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 26, 1990	Lead and Copper Rule
Apr 1, 1987	Mar 31, 1990	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Mar 31, 1990	Inorganic Chemicals
Apr 1, 1987	Mar 31, 1990	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Mar 31, 1990	Inorganic Chemicals
Apr 1, 1987	Mar 31, 1990	Mercury	MR	No	Yes	—	0.002 mg/L	—	Resolved	Mar 31, 1990	Inorganic Chemicals
Apr 1, 1987	Mar 31, 1990	Mercury	MR	No	Yes	—	0.002 mg/L	—	Resolved	Mar 31, 1990	Inorganic Chemicals
Apr 1, 1987	Mar 31, 1990	Fluoride	MR	No	Yes	—	4.0 mg/L	—	Resolved	Mar 31, 1990	Inorganic Chemicals

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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