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Product Safety9,700+ CPSC product recalls Food Safety28,600+ FDA food recalls Pet Safety1.3M FDA animal adverse events Drug Safety17,500+ FDA drug recalls Device Safety38,400+ FDA device recalls Workplace Safety102,900+ OSHA injury reports Brand HistoryRecall lookup by company

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MASON CITY WATER DEPARTMENT

Iowa — Community Water System — PWSID: IA1750048

System Information

PWSIDIA1750048
System NameMASON CITY WATER DEPARTMENT
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region07
Serves SchoolNo
WholesalerNo
First ReportedFeb 27, 1979
Last ReportedMar 17, 2026

Location & Contact

StateIowa
CityMASON CITY
ZIP Code50401
AddressATTN DON THORSON WATER SUPT
OrganizationMASON CITY WATER DEPARTMENT
Phone641-421-3683

Population & Service

Population Served27,338
Service Connections19,000

Drinking Water Violations (647)

This water system has 647 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
Jun 1, 2024 Jun 30, 2024 MON No No — — — Resolved Jun 30, 2024 —
Jun 1, 2024 Jun 30, 2024 MON No No — — — Resolved Jun 30, 2024 —
Jun 1, 2024 Jun 30, 2024 MON No No — — — Resolved Jun 30, 2024 —
Jun 1, 2024 Jun 30, 2024 MON No No — — — Resolved Jun 30, 2024 —
Aug 1, 2012 Aug 31, 2012 MCL Yes No — 5% of samples — Resolved Aug 31, 2012 —
Aug 1, 2012 Aug 31, 2012 MCL Yes No — 5% of samples — Resolved Aug 31, 2012 —
Aug 1, 2012 Aug 31, 2012 MCL Yes No — 5% of samples — Resolved Aug 31, 2012 —
Aug 1, 2012 Aug 31, 2012 MCL Yes No — 5% of samples — Resolved Aug 31, 2012 —
Aug 1, 2012 Aug 31, 2012 MCL Yes No — 5% of samples — Resolved Aug 31, 2012 —
Jul 1, 2009 Aug 31, 2009 MR No Yes — 0.060 mg/L — Resolved Aug 31, 2009 —
Jul 1, 2009 Aug 31, 2009 MR No Yes — 0.060 mg/L — Resolved Aug 31, 2009 —
Jul 1, 2009 Aug 31, 2009 MR No Yes — 0.060 mg/L — Resolved Aug 31, 2009 —
Jul 1, 2009 Aug 31, 2009 MR No Yes — 0.060 mg/L — Resolved Aug 31, 2009 —
Jun 1, 2008 Jun 30, 2008 MCL Yes No — 5% of samples — Resolved Jun 30, 2008 —
Jun 1, 2008 Jun 30, 2008 MCL Yes No — 5% of samples — Resolved Jun 30, 2008 —
Jun 1, 2008 Jun 30, 2008 MCL Yes No — 5% of samples — Resolved Jun 30, 2008 —
Jun 1, 2008 Jun 30, 2008 MCL Yes No — 5% of samples — Resolved Jun 30, 2008 —
Jun 1, 2008 Jun 30, 2008 MCL Yes No — 5% of samples — Resolved Jun 30, 2008 —
Oct 1, 2004 Dec 31, 2004 MCL Yes No 5.2 5 pCi/L — Resolved Dec 31, 2004 —
Oct 1, 2004 Dec 31, 2004 MR No Yes — 15 pCi/L — Resolved Dec 31, 2004 —
Oct 1, 2004 Dec 31, 2004 MCL Yes No 5.2 5 pCi/L — Resolved Dec 31, 2004 —
Oct 1, 2004 Dec 31, 2004 MR No Yes — 15 pCi/L — Resolved Dec 31, 2004 —
Oct 1, 2004 Dec 31, 2004 MR No Yes — 15 pCi/L — Resolved Dec 31, 2004 —
Oct 1, 2004 Dec 31, 2004 MCL Yes No 5.2 5 pCi/L — Resolved Dec 31, 2004 —
Oct 1, 2004 Dec 31, 2004 MCL Yes No 5.2 5 pCi/L — Resolved Dec 31, 2004 —
Oct 1, 2004 Dec 31, 2004 MCL Yes No 5.2 5 pCi/L — Resolved Dec 31, 2004 —
Aug 1, 2004 Aug 31, 2004 MCL Yes No — 5% of samples — Resolved Aug 31, 2004 —
Aug 1, 2004 Aug 31, 2004 MCL Yes No — 5% of samples — Resolved Aug 31, 2004 —
Aug 1, 2004 Aug 31, 2004 MCL Yes No — 5% of samples — Resolved Aug 31, 2004 —
Aug 1, 2004 Aug 31, 2004 MCL Yes No — 5% of samples — Resolved Aug 31, 2004 —
Jul 1, 2004 Sep 30, 2004 MR No Yes — 15 pCi/L — Resolved Sep 30, 2004 —
Jul 1, 2004 — Other No No — — — Resolved Jun 28, 2006 —
Jul 1, 2004 — Other No No — — — Resolved Jun 28, 2006 —
Jul 1, 2004 Sep 30, 2004 MR No Yes — 15 pCi/L — Resolved Sep 30, 2004 —
Jul 1, 2004 Sep 30, 2004 MCL Yes No 5.7 5 pCi/L — Resolved Sep 30, 2004 —
Jul 1, 2004 Sep 30, 2004 MCL Yes No 5.7 5 pCi/L — Resolved Sep 30, 2004 —
Jul 1, 2004 Sep 30, 2004 MCL Yes No 5.7 5 pCi/L — Resolved Sep 30, 2004 —
Jul 1, 2004 Sep 30, 2004 MCL Yes No 5.7 5 pCi/L — Resolved Sep 30, 2004 —
Jul 1, 2004 Sep 30, 2004 MCL Yes No 5.7 5 pCi/L — Resolved Sep 30, 2004 —
Jul 1, 2004 — Other No No — — — Resolved Jun 28, 2006 —
Jul 1, 2004 — Other No No — — — Resolved Jun 28, 2006 —
Jul 1, 2004 Sep 30, 2004 MR No Yes — 15 pCi/L — Resolved Sep 30, 2004 —
Mar 1, 2004 Mar 31, 2004 MCL Yes No — 5% of samples — Resolved Mar 31, 2004 —
Mar 1, 2004 Mar 31, 2004 MCL Yes No — 5% of samples — Resolved Mar 31, 2004 —
Mar 1, 2004 Mar 31, 2004 MCL Yes No — 5% of samples — Resolved Mar 31, 2004 —
Mar 1, 2004 Mar 31, 2004 MCL Yes No — 5% of samples — Resolved Mar 31, 2004 —
Jan 1, 2004 Mar 31, 2004 MCL Yes No 8.2 5 pCi/L — Resolved Mar 31, 2004 —
Jan 1, 2004 Mar 31, 2004 MCL Yes No 8.2 5 pCi/L — Resolved Mar 31, 2004 —
Jan 1, 2004 Mar 31, 2004 MCL Yes No 8.2 5 pCi/L — Resolved Mar 31, 2004 —
Jan 1, 2004 Mar 31, 2004 MCL Yes No 8.2 5 pCi/L — Resolved Mar 31, 2004 —

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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