MASON CITY

Illinois — Community Water System — PWSID: IL1250350

System Information

PWSID	IL1250350
System Name	MASON CITY
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Local
EPA Region	05
Serves School	No
Wholesaler	No
First Reported	Feb 13, 1981
Last Reported	Dec 4, 2025

Location & Contact

State	Illinois
City	MASON CITY
ZIP Code	62664
Address	145 S Main St
Organization	SNYDER, KEVIN
Phone	217-482-3669

Population & Service

Population Served	2,558
Service Connections	1,080

Drinking Water Violations (91)

This water system has 91 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 2, 2025	—	LEAD AND COPPER RULE REVISIONS	RPT	No	No	—	—	—	Unaddressed	—	Lead and Copper Rule Revisions
Jul 2, 2025	—	LEAD AND COPPER RULE REVISIONS	RPT	No	No	—	—	—	Unaddressed	—	Lead and Copper Rule Revisions
Jul 1, 2009	Sep 30, 2009	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2009	Arsenic Rule
Jul 1, 2009	Sep 30, 2009	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2009	Arsenic Rule
Jul 1, 2009	Sep 30, 2009	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2009	Arsenic Rule
Jul 1, 2009	Sep 30, 2009	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2009	Arsenic Rule
Apr 1, 2009	Jun 30, 2009	Arsenic	MCL	Yes	No	.052 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2009	Arsenic Rule
Apr 1, 2009	Jun 30, 2009	Arsenic	MCL	Yes	No	.052 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2009	Arsenic Rule
Apr 1, 2009	Jun 30, 2009	Arsenic	MCL	Yes	No	.052 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2009	Arsenic Rule
Apr 1, 2009	Jun 30, 2009	Arsenic	MCL	Yes	No	.052 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2009	Arsenic Rule
Apr 1, 2009	Jun 30, 2009	Arsenic	MCL	Yes	No	.052 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2009	Arsenic Rule
Apr 1, 2009	Jun 30, 2009	Arsenic	MCL	Yes	No	.052 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.037 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.037 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.037 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.037 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.037 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.037 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2009	Arsenic Rule
Oct 1, 2008	Dec 31, 2008	Arsenic	MCL	Yes	No	.017 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2008	Arsenic Rule
Oct 1, 2008	Dec 31, 2008	Arsenic	MCL	Yes	No	.017 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2008	Arsenic Rule
Oct 1, 2008	Dec 31, 2008	Arsenic	MCL	Yes	No	.017 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2008	Arsenic Rule
Oct 1, 2008	Dec 31, 2008	Arsenic	MCL	Yes	No	.017 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2008	Arsenic Rule
Oct 1, 2008	Dec 31, 2008	Arsenic	MCL	Yes	No	.017 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2008	Arsenic Rule
Oct 1, 2008	Dec 31, 2008	Arsenic	MCL	Yes	No	.017 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.016 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.016 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.016 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.016 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.016 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.016 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2008	Arsenic Rule
Apr 1, 2008	Jun 30, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2008	Arsenic Rule
Apr 1, 2008	Jun 30, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2008	Arsenic Rule
Apr 1, 2008	Jun 30, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2008	Arsenic Rule
Apr 1, 2008	Jun 30, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2008	Arsenic Rule
Apr 1, 2008	Jun 30, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2008	Arsenic Rule
Apr 1, 2008	Jun 30, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Jun 30, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.025 MG/L	0.010 mg/L	.01	Resolved	Mar 31, 2008	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.024 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2007	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.024 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2007	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.024 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2007	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.024 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2007	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.024 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2007	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.024 MG/L	0.010 mg/L	.01	Resolved	Dec 31, 2007	Arsenic Rule
Jul 1, 2007	Sep 30, 2007	Arsenic	MCL	Yes	No	.022 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2007	Arsenic Rule
Jul 1, 2007	Sep 30, 2007	Arsenic	MCL	Yes	No	.022 MG/L	0.010 mg/L	.01	Resolved	Sep 30, 2007	Arsenic Rule

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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