CORWITH WATER SUPPLY

Iowa — Community Water System — PWSID: IA4109077

System Information

PWSID	IA4109077
System Name	CORWITH 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	CORWITH
ZIP Code	50430-5007
Address	ATTN WATER SUPT
Organization	CORWITH WATER SUPPLY
Phone	515-583-2342

Population & Service

Population Served	266
Service Connections	159

Drinking Water Violations (52)

This water system has 52 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
Jul 1, 2018	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 27, 2018	Consumer Confidence Rule
Jul 1, 2018	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 27, 2018	Consumer Confidence Rule
Jan 14, 2018	—	Groundwater Rule	Other	No	No	—	—	—	Resolved	Mar 22, 2018	Ground Water Rule
Jan 14, 2018	—	Groundwater Rule	Other	No	No	—	—	—	Resolved	Mar 22, 2018	Ground Water Rule
Oct 1, 2016	Sep 30, 2017	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Sep 30, 2017	Nitrate Rule
Oct 1, 2016	Sep 30, 2017	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Sep 30, 2017	Nitrate Rule
Oct 1, 2016	Sep 30, 2017	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Sep 30, 2017	Nitrate Rule
Oct 1, 2016	Sep 30, 2017	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Sep 30, 2017	Nitrate Rule
Oct 1, 2012	Sep 30, 2013	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Sep 30, 2013	Arsenic Rule
Oct 1, 2012	Sep 30, 2013	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Sep 30, 2013	Arsenic Rule
Oct 1, 2012	Sep 30, 2013	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Sep 30, 2013	Arsenic Rule
Oct 1, 2012	Sep 30, 2013	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Sep 30, 2013	Arsenic Rule
Mar 1, 1997	Mar 31, 1997	Nitrite	MR	No	Yes	—	1 mg/L	—	Resolved	Mar 31, 1997	Nitrate Rule
Mar 1, 1997	Mar 31, 1997	Nitrite	MR	No	Yes	—	1 mg/L	—	Resolved	Mar 31, 1997	Nitrate Rule
Mar 1, 1997	Mar 31, 1997	Nitrite	MR	No	Yes	—	1 mg/L	—	Resolved	Mar 31, 1997	Nitrate Rule
Jan 1, 1996	Dec 31, 2000	Di(2-ethylhexyl) phthalate	MCL	Yes	No	.013	0.006 mg/L	—	Resolved	Nov 2, 2000	Synthetic Organic Chemicals
Apr 1, 1994	Mar 31, 1997	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Mar 31, 1997	Inorganic Chemicals
Apr 1, 1994	Mar 31, 1997	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Mar 31, 1997	Inorganic Chemicals
Apr 1, 1994	Mar 31, 1997	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Mar 31, 1997	Inorganic Chemicals
Nov 1, 1993	Nov 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 1993	Total Coliform Rule
Nov 1, 1993	Nov 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 1993	Total Coliform Rule
Nov 1, 1993	Nov 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 1993	Total Coliform Rule
Nov 1, 1993	Nov 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 1993	Total Coliform Rule
Nov 1, 1993	Nov 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 1993	Total Coliform Rule
Nov 1, 1993	Nov 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 1993	Total Coliform Rule
Jul 1, 1993	Jul 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1993	Total Coliform Rule
Jul 1, 1993	Jun 30, 1997	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1997	Radionuclides and Revised Rad Rule
Jul 1, 1993	Jun 30, 1997	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1997	Radionuclides and Revised Rad Rule
Jul 1, 1993	Jun 30, 1997	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1997	Radionuclides and Revised Rad Rule
Jul 1, 1993	Jul 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1993	Total Coliform Rule
Jul 1, 1993	Jul 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1993	Total Coliform Rule
Jul 1, 1993	Jul 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1993	Total Coliform Rule
Jul 1, 1993	Jul 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1993	Total Coliform Rule
Jul 1, 1993	Jun 30, 1997	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1997	Radionuclides and Revised Rad Rule
Feb 1, 1993	Feb 28, 1993	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 28, 1993	Total Coliform Rule
Feb 1, 1993	Feb 28, 1993	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 28, 1993	Total Coliform Rule
Feb 1, 1993	Feb 28, 1993	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 28, 1993	Total Coliform Rule
Feb 1, 1993	Feb 28, 1993	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 28, 1993	Total Coliform Rule
Feb 1, 1993	Feb 28, 1993	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 28, 1993	Total Coliform Rule
Jul 1, 1985	Jun 30, 1989	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1989	Radionuclides and Revised Rad Rule
Jul 1, 1985	Jun 30, 1989	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 1989	Radionuclides and Revised Rad Rule
—	—		—	No	No	—	—	—	—	—	—
—	—		—	No	No	—	—	—	—	—	—
—	—		—	No	No	—	—	—	—	—	—
—	—		—	No	No	—	—	—	—	—	—
—	—		—	No	No	—	—	—	—	—	—
—	—		—	No	No	—	—	—	—	—	—
—	—		—	No	No	—	—	—	—	—	—
—	—		—	No	No	—	—	—	—	—	—
—	—		—	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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