CLARENCE WATER SUPPLY

Iowa — Community Water System — PWSID: IA1630028

System Information

PWSID	IA1630028
System Name	CLARENCE 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	MECHANICSVILLE
ZIP Code	52306
Address	ATTN STEVE IHNS WATER SUPT
Organization	CLARENCE WATER SUPPLY
Phone	563-452-3625

Population & Service

Population Served	1,039
Service Connections	502

Drinking Water Violations (73)

This water system has 73 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
Dec 1, 2017	Dec 31, 2017	Revised Total Coliform Rule	MON	No	Yes	—	—	—	Resolved	Dec 31, 2017	Revised Total Coliform Rule
Dec 1, 2017	Dec 31, 2017	Revised Total Coliform Rule	MON	No	Yes	—	—	—	Resolved	Dec 31, 2017	Revised Total Coliform Rule
Dec 1, 2017	Dec 31, 2017	Revised Total Coliform Rule	MON	No	Yes	—	—	—	Resolved	Dec 31, 2017	Revised Total Coliform Rule
Dec 1, 2017	Dec 31, 2017	Revised Total Coliform Rule	MON	No	Yes	—	—	—	Resolved	Dec 31, 2017	Revised Total Coliform Rule
Jul 1, 2017	Jun 30, 2018	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 2018	Nitrate Rule
Jul 1, 2017	Jun 30, 2018	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 2018	Nitrate Rule
Jul 1, 2017	Jun 30, 2018	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 2018	Nitrate Rule
Jul 1, 2017	Jun 30, 2018	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Jun 30, 2018	Nitrate Rule
Aug 1, 2006	Aug 31, 2006	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 2006	Total Coliform Rule
Aug 1, 2006	Aug 31, 2006	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 2006	Total Coliform Rule
Aug 1, 2006	Aug 31, 2006	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 2006	Total Coliform Rule
Aug 1, 2006	Aug 31, 2006	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 2006	Total Coliform Rule
May 1, 2001	May 31, 2001	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 2001	Total Coliform Rule
May 1, 2001	May 31, 2001	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 2001	Total Coliform Rule
May 1, 2001	May 31, 2001	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 2001	Total Coliform Rule
May 1, 2001	May 31, 2001	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 2001	Total Coliform Rule
May 1, 2001	May 31, 2001	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 2001	Total Coliform Rule
Jul 1, 2000	Jun 30, 2001	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 2001	Arsenic Rule
Jul 1, 2000	Jun 30, 2001	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 2001	Arsenic Rule
Jul 1, 2000	Jun 30, 2001	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 2001	Arsenic Rule
Jul 1, 2000	Jun 30, 2001	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 2001	Arsenic Rule
Jul 1, 2000	Jun 30, 2001	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 2001	Arsenic Rule
Apr 1, 1999	Apr 30, 1999	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 1999	Total Coliform Rule
Apr 1, 1999	Apr 30, 1999	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 1999	Total Coliform Rule
Apr 1, 1999	Apr 30, 1999	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 1999	Total Coliform Rule
Apr 1, 1999	Apr 30, 1999	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 1999	Total Coliform Rule
Jan 1, 1998	Jan 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1998	Total Coliform Rule
Jan 1, 1998	Jan 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1998	Total Coliform Rule
Jan 1, 1998	Jan 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1998	Total Coliform Rule
May 1, 1996	May 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 1996	Total Coliform Rule
May 1, 1996	May 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 1996	Total Coliform Rule
May 1, 1996	May 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 1996	Total Coliform Rule
May 1, 1996	May 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 1996	Total Coliform Rule
Jan 1, 1995	Jan 31, 1995	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jan 31, 1995	Total Coliform Rule
Jan 1, 1995	Jan 31, 1995	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jan 31, 1995	Total Coliform Rule
Jan 1, 1995	Jan 31, 1995	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jan 31, 1995	Total Coliform Rule
Jan 1, 1995	Jan 31, 1995	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jan 31, 1995	Total Coliform Rule
Jan 1, 1995	Jan 31, 1995	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jan 31, 1995	Total Coliform Rule
Jan 1, 1995	Jan 31, 1995	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jan 31, 1995	Total Coliform Rule
Oct 1, 1990	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Apr 1, 1991	Lead and Copper Rule
Oct 1, 1990	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Apr 1, 1991	Lead and Copper Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Jan 1, 1990	Dec 31, 1993	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 1993	Radionuclides and Revised Rad Rule
Apr 1, 1988	Mar 31, 1991	Mercury	MR	No	Yes	—	0.002 mg/L	—	Resolved	Mar 31, 1991	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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