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ANN ARBOR

Michigan — Community Water System — PWSID: MI0000220

System Information

PWSIDMI0000220
System NameANN ARBOR
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region05
Serves SchoolNo
WholesalerNo
First ReportedFeb 3, 1981
Last ReportedDec 18, 2025

Location & Contact

StateMichigan
CityANN ARBOR
ZIP Code48103
Address919 SUNSET RD
OrganizationMACIEJEWSKI, MOLLY
Phone734-794-6000

Population & Service

Population Served241,868
Service Connections26,050

Drinking Water Violations (101)

This water system has 101 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
Nov 1, 2016 Nov 30, 2016 Cryptosporidium MR No Yes — — — Resolved Nov 30, 2016 Long Term 2 Enhanced Surface Water Treatment Rule
Nov 1, 2016 Nov 30, 2016 Cryptosporidium MR No Yes — — — Resolved Nov 30, 2016 Long Term 2 Enhanced Surface Water Treatment Rule
Nov 1, 2016 Nov 30, 2016 Cryptosporidium MR No Yes — — — Resolved Nov 30, 2016 Long Term 2 Enhanced Surface Water Treatment Rule
Jan 1, 2011 Mar 31, 2011 CARBON, TOTAL MR No Yes — TT — Resolved Mar 21, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 CARBON, TOTAL MR No Yes — TT — Resolved Mar 21, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 CARBON, TOTAL MR No Yes — TT — Resolved Mar 21, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 CARBON, TOTAL MR No Yes — TT — Resolved Mar 21, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2008 Jan 31, 2008 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jan 8, 2008 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2008 Jan 31, 2008 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jan 8, 2008 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2008 Jan 31, 2008 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jan 8, 2008 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2008 Jan 31, 2008 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jan 8, 2008 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2008 Sep 30, 2008 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2008 Synthetic Organic Chemicals
Jan 1, 2008 Sep 30, 2008 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2008 Synthetic Organic Chemicals
Jan 1, 2008 Sep 30, 2008 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2008 Synthetic Organic Chemicals
Jan 1, 2008 Sep 30, 2008 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2008 Synthetic Organic Chemicals
Jan 1, 2008 Sep 30, 2008 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2008 Synthetic Organic Chemicals
Jul 1, 2006 Jul 31, 2006 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jul 18, 2006 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2006 Jul 31, 2006 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jul 18, 2006 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2006 Jul 31, 2006 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jul 18, 2006 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2006 Jul 31, 2006 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jul 18, 2006 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jun 1, 2006 Jun 30, 2006 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jun 21, 2006 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jun 1, 2006 Jun 30, 2006 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jun 21, 2006 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jun 1, 2006 Jun 30, 2006 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jun 21, 2006 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2005 Sep 30, 2005 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Sep 7, 2005 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2005 Sep 30, 2005 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Sep 7, 2005 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2005 Sep 30, 2005 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Sep 7, 2005 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2004 Sep 30, 2004 Bromate MR No Yes — 0.010 mg/L — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 Bromate MR No Yes — 0.010 mg/L — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 Bromate MR No Yes — 0.010 mg/L — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 Bromate MR No Yes — 0.010 mg/L — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Sep 1, 2003 Sep 30, 2003 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Sep 18, 2003 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2003 Sep 30, 2003 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Sep 18, 2003 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2003 Sep 30, 2003 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Sep 18, 2003 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Aug 1, 2003 Aug 31, 2003 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Aug 19, 2003 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Aug 1, 2003 Aug 31, 2003 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Aug 19, 2003 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Aug 1, 2003 Aug 31, 2003 Interim Enhanced Surface Water Treatment Rule MR No No — — — Resolved Aug 19, 2003 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Apr 1, 2003 Apr 30, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 29, 2003 Total Coliform Rule
Apr 1, 2003 Apr 30, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 29, 2003 Total Coliform Rule
Apr 1, 2003 Apr 30, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 29, 2003 Total Coliform Rule
Apr 1, 2003 Apr 30, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 29, 2003 Total Coliform Rule
Apr 1, 2003 Apr 30, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 29, 2003 Total Coliform Rule
Jul 1, 2002 Jul 31, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 22, 2002 Total Coliform Rule
Jul 1, 2002 Jul 31, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 22, 2002 Total Coliform Rule
Jul 1, 2002 Jul 31, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 22, 2002 Total Coliform Rule
Jul 1, 2002 Jul 31, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 22, 2002 Total Coliform Rule
Mar 1, 2002 Mar 31, 2002 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Mar 14, 2002 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Mar 1, 2002 Mar 31, 2002 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Mar 14, 2002 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Mar 1, 2002 Mar 31, 2002 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Mar 14, 2002 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Mar 1, 2002 Mar 31, 2002 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Mar 14, 2002 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Feb 1, 2002 Feb 28, 2002 Interim Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Feb 28, 2002 Interim and Long Term 1 Enhanced Surface Water Treatment 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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