OHA Drinking Water Services
OR41
PWS ID: 00906 ---- TUALATIN, CITY OF
Maximum Residual Disinfection Level (MRDL) Samples
MRDL Monitoring Requirements :: Excel Spreadsheet

Monitoring
Period		 Entry
Point		 Samples
Required		 Samples
Collected		 Period
Avg		 Annual
Avg		 Level
Compliance
May 01, 2024 DIST-A 30 30 1.5 1.6Y
Apr 01, 2024 DIST-A 30 30 1.64 1.6Y
Mar 01, 2024 DIST-A 30 30 1.58 1.6Y
Feb 01, 2024 DIST-A 30 30 1.51 1.6Y
Jan 01, 2024 DIST-A 30 30 1.51 1.6Y
Dec 01, 2023 DIST-A 30 30 1.36 1.6Y
Nov 01, 2023 DIST-A 30 30 1.31 1.6Y
Oct 01, 2023 DIST-A 30 30 1.56 1.7Y
Sep 01, 2023 DIST-A 30 30 1.61 1.7Y
Aug 01, 2023 DIST-A 30 30 1.80 1.7Y
Jul 01, 2023 DIST-A 30 30 1.89 1.7Y
Jun 01, 2023 DIST-A 30 30 1.6 1.7Y
May 01, 2023 DIST-A 30 30 1.6 1.7Y
Apr 01, 2023 DIST-A 30 30 1.70 1.7Y
Mar 01, 2023 DIST-A 30 30 1.6 1.7Y
Feb 01, 2023 DIST-A 30 30 1.6 1.7Y
Jan 01, 2023 DIST-A 30 30 1.7 1.7Y
Dec 01, 2022 DIST-A 30 30 1.60 1.7Y
Nov 01, 2022 DIST-A 30 30 1.7 1.7Y
Oct 01, 2022 DIST-A 30 30 1.78 1.7Y
Sep 01, 2022 DIST-A 30 30 1.70 1.6Y
Aug 01, 2022 DIST-A 30 30 1.89 1.6Y
Jul 01, 2022 DIST-A 30 30 1.72 1.6Y
Jun 01, 2022 DIST-A 30 30 1.38 1.6Y
May 01, 2022 DIST-A 30 30 1.58 1.7Y
Apr 01, 2022 DIST-A 30 30 1.69 1.7Y
Mar 01, 2022 DIST-A 30 30 1.68 1.7Y
Feb 01, 2022 DIST-A 30 30 1.65 1.7Y
Jan 01, 2022 DIST-A 30 30 1.74 1.7Y
Dec 01, 2021 DIST-A 30 30 1.60 1.7Y
Nov 01, 2021 DIST-A 30 30 1.50 1.6Y
Oct 01, 2021 DIST-A 30 30 1.5 1.6Y
Sep 01, 2021 DIST-A 30 30 1.85 1.6Y
Aug 01, 2021 DIST-A 30 30 1.89 1.6Y
Jul 01, 2021 DIST-A 30 30 1.71 1.6Y
Jun 01, 2021 DIST-A 30 30 1.56 1.6Y
May 01, 2021 DIST-A 30 30 1.61 1.6Y
Apr 01, 2021 DIST-A 30 30 1.7 1.6Y
Mar 01, 2021 DIST-A 30 30 1.7 1.6Y
Feb 01, 2021 DIST-A 30 30 1.63 1.6Y
Jan 01, 2021 DIST-A 30 30 1.57 1.6Y
Dec 01, 2020 DIST-A 30 30 1.5 1.6Y
Nov 01, 2020 DIST-A 30 30 1.50 1.6Y
Oct 01, 2020 DIST-A 30 30 1.55 1.5Y
Sep 01, 2020 DIST-A 30 30 1.59 1.5Y
Aug 01, 2020 DIST-A 30 30 1.63 1.5Y
Jul 01, 2020 DIST-A 30 30 1.6 1.5Y
Jun 01, 2020 DIST-A 30 30 1.68 1.5Y
May 01, 2020 DIST-A 30 30 1.48 1.5Y
Apr 01, 2020 DIST-A 30 30 1.53 1.5Y
Mar 01, 2020 DIST-A 30 30 1.4 1.5Y
Feb 01, 2020 DIST-A 30 30 1.6 1.5Y
Jan 01, 2020 DIST-A 30 30 1.7 1.5Y
Dec 01, 2019 DIST-A 30 30 1.43 1.5Y
Nov 01, 2019 DIST-A 30 30 1.3 1.5Y
Oct 01, 2019 DIST-A 30 30 1.1 1.5Y
Sep 01, 2019 DIST-A 30 30 1.28 1.5Y
Aug 01, 2019 DIST-A 30 30 1.7 1.6Y
Jul 01, 2019 DIST-A 30 30 1.56 1.6Y
Jun 01, 2019 DIST-A 30 30 1.59 1.6Y
May 01, 2019 DIST-A 30 30 1.61 1.6Y
Apr 01, 2019 DIST-A 30 30 1.6 1.6Y
Mar 01, 2019 DIST-A 30 30 1.6 1.6Y
Feb 01, 2019 DIST-A 30 30 1.60 1.5Y
Jan 01, 2019 DIST-A 30 30 1.6 1.5Y
Dec 01, 2018 DIST-A 30 30 1.4 1.5Y
Nov 01, 2018 DIST-A 30 30 1.38 1.5Y
Oct 01, 2018 DIST-A 30 30 1.55 1.5Y
Sep 01, 2018 DIST-A 30 30 1.70 1.5Y
Aug 01, 2018 DIST-A 30 30 1.71 1.5Y
Jul 01, 2018 DIST-A 30 30 1.66 1.5Y
Jun 01, 2018 DIST-A 30 30 1.53 1.5Y
May 01, 2018 DIST-A 30 30 1.56 1.5Y
Apr 01, 2018 DIST-A 30 30 1.4 1.5Y
Mar 01, 2018 DIST-A 30 30 1.4 1.5Y
Feb 01, 2018 DIST-A 30 30 1.39 1.5Y
Jan 01, 2018 DIST-A 30 30 1.46 1.5Y
Dec 01, 2017 DIST-A 30 30 1.47 1.5Y
Nov 01, 2017 DIST-A 30 30 1.2 1.5Y
Oct 01, 2017 DIST-A 30 30 1.44 1.5Y
Sep 01, 2017 DIST-A 30 30 1.63 1.5Y
Aug 01, 2017 DIST-A 30 30 1.66 1.5Y
Jul 01, 2017 DIST-A 30 30 1.61 1.5Y
Jun 01, 2017 DIST-A 30 30 1.8 1.5Y
May 01, 2017 DIST-A 30 30 1.5 1.5Y
Apr 01, 2017 DIST-A 30 30 1.51 1.5Y
Mar 01, 2017 DIST-A 30 30 1.6 1.5Y
Feb 01, 2017 DIST-A 30 30 1.59 1.5Y
Jan 01, 2017 DIST-A 30 30 1.38 1.5Y
Dec 01, 2016 DIST-A 30 30 1.49 1.5Y
Nov 01, 2016 DIST-A 30 30 1.2 1.5Y
Oct 01, 2016 DIST-A 30 30 1.07 1.5Y
Sep 01, 2016 DIST-A 30 30 1.57 1.5Y
Aug 01, 2016 DIST-A 30 30 1.7 1.5Y
Jul 01, 2016 DIST-A 30 30 1.53 1.5Y
Jun 01, 2016 DIST-A 30 30 1.58 1.5Y
May 01, 2016 DIST-A 30 30 1.5 1.5Y
Apr 01, 2016 DIST-A 30 30 1.62 1.5Y
Mar 01, 2016 DIST-A 30 30 1.56 1.5Y
Feb 01, 2016 DIST-A 30 30 1.5 1.5Y
Jan 01, 2016 DIST-A 30 30 1.36 1.5Y
Dec 01, 2015 DIST-A 30 30 1.3 1.5Y
Nov 01, 2015 DIST-A 30 30 1.44 1.5Y
Oct 01, 2015 DIST-A 30 30 1.58 1.5Y
Sep 01, 2015 DIST-A 30 30 1.46 1.5Y
Aug 01, 2015 DIST-A 30 30 1.62 1.5Y
Jul 01, 2015 DIST-A 30 30 1.58 1.5Y
Jun 01, 2015 DIST-A 30 30 1.62 1.5Y
May 01, 2015 DIST-A 30 30 1.46 1.5Y
Apr 01, 2015 DIST-A 30 30 1.44 1.5Y
Mar 01, 2015 DIST-A 30 30 1.5 1.5Y
Feb 01, 2015 DIST-A 30 30 1.5 1.5Y
Jan 01, 2015 DIST-A 30 30 1.59 1.5Y
Dec 01, 2014 DIST-A 30 30 1.37 1.6Y
Nov 01, 2014 DIST-A 30 30 1.18 1.6Y
Oct 01, 2014 DIST-A 30 30 1.59 1.6Y
Sep 01, 2014 DIST-A 30 30 1.6 1.6Y
Aug 01, 2014 DIST-A 30 30 1.6 1.6Y
Jul 01, 2014 DIST-A 33 33 1.6 1.6Y
Jun 01, 2014 DIST-A 30 30 1.6 1.5Y
May 01, 2014 DIST-A 30 30 1.52 1.5Y
Apr 01, 2014 DIST-A 30 30 1.56 1.5Y
Mar 01, 2014 DIST-A 30 30 1.60 1.5Y
Feb 01, 2014 DIST-A 30 30 1.70 1.5Y
Jan 01, 2014 DIST-A 30 30 1.79 1.4Y
Dec 01, 2013 DIST-A 30 30 2 1.4Y
Nov 01, 2013 DIST-A 30 30 1.5 1.3Y
Oct 01, 2013 DIST-A 30 30 1.59 1.3Y
Sep 01, 2013 DIST-A 30 30 1 1.2Y
Aug 01, 2013 DIST-A 30 30 1.22 1.3Y
Jul 01, 2013 DIST-A 30 30 1.3 1.3Y
Jun 01, 2013 DIST-A 30 30 1.41 1.3Y
May 01, 2013 DIST-A 30 30 1.39 1.3Y
Apr 01, 2013 DIST-A 30 30 1.36 1.3Y
Mar 01, 2013 DIST-A 30 30 1.34 1.3Y
Feb 01, 2013 DIST-A 30 30 1.34 1.3Y
Jan 01, 2013 DIST-A 30 30 1.34 1.3Y
Dec 01, 2012 DIST-A 30 30 1.09 1.3Y
Nov 01, 2012 DIST-A 30 30 1.02 1.3Y
Oct 01, 2012 DIST-A 30 30 1 1.3Y
Sep 01, 2012 DIST-A 30 30 1.2 1.3Y
Aug 01, 2012 DIST-A 30 30 1.28 1.3Y
Jul 01, 2012 DIST-A 30 30 1.37 1.3Y
Jun 01, 2012 DIST-A 30 30 1.38 1.3Y
May 01, 2012 DIST-A 30 30 1.4 1.3Y
Apr 01, 2012 DIST-A 30 30 1.40 1.3Y
Mar 01, 2012 DIST-A 30 30 1.40 1.3Y
Feb 01, 2012 DIST-A 30 30 1.41 1.3Y
Jan 01, 2012 DIST-A 30 30 1.27 1.3Y
Dec 01, 2011 DIST-A 30 30 1.26 1.3Y
Nov 01, 2011 DIST-A 30 30 0.97 1.3Y
Oct 01, 2011 DIST-A 30 30 1.27 1.3Y
Sep 01, 2011 DIST-A 30 30 1.27 1.3Y
Aug 01, 2011 DIST-A 30 30 1.40 1.2Y
Jul 01, 2011 DIST-A 30 30 1.32 1.2Y
Jun 01, 2011 DIST-A 30 30 1.29 1.2Y
May 01, 2011 DIST-A 30 30 1.22 1.2Y
Apr 01, 2011 DIST-A 30 30 1.37 1.2Y
Mar 01, 2011 DIST-A 30 30 1.39 1.2Y
Feb 01, 2011 DIST-A 30 30 1.35 1.2Y
Jan 01, 2011 DIST-A 30 30 1.28 1.2Y
Jan 01, 2011 DIST-A 30 30 1.28 1.2Y
Dec 01, 2010 DIST-A 30 30 1.21 1.2Y
Nov 01, 2010 DIST-A 30 30 0.96 1.2Y
Oct 01, 2010 DIST-A 30 30 1.05 1.2Y
Sep 01, 2010 DIST-A 30 30 1.12 1.2Y
Aug 01, 2010 DIST-A 30 30 1.18 1.2Y
Jul 01, 2010 DIST-A 30 30 1.16 1.2Y
Jun 01, 2010 DIST-A 30 30 1.21 1.3Y
May 01, 2010 DIST-A 30 30 1.24 1.3Y
May 01, 2010 DIST-A 30 30 1.30 1.3Y
Apr 01, 2010 DIST-A 30 30 1.28 1.3Y
Apr 01, 2010 DIST-A 30 30 1.27 1.3Y
Mar 01, 2010 DIST-A 30 30 1.29 1.3Y
Mar 01, 2010 DIST-A 30 30 1.29 1.3Y
Feb 01, 2010 DIST-A 30 30 1.4 1.3Y
Feb 01, 2010 DIST-A 30 30 1.39 1.3Y
Jan 01, 2010 DIST-A 30 30 1.21 1.3Y
Jan 01, 2010 DIST-A 30 30 1.21 1.3Y
Dec 01, 2009 DIST-A 30 30 1.23 1.3Y
Dec 01, 2009 DIST-A 30 30 1.23 1.3Y
Nov 01, 2009 DIST-A 30 30 1.1000 1.3Y
Nov 01, 2009 DIST-A 30 30 1.10 1.3Y
Oct 01, 2009 DIST-A 30 30 1.3 1.3Y
Oct 01, 2009 DIST-A 30 30 1.33 1.3Y
Sep 01, 2009 DIST-A 30 30 1.18 1.3Y
Sep 01, 2009 DIST-A 30 30 1.14 1.3Y
Aug 01, 2009 DIST-A 30 30 1.3 1.4Y
Jul 01, 2009 DIST-A 30 31 1.3 1.4Y
Jun 01, 2009 DIST-A 30 30 1.4 1.4Y
May 01, 2009 DIST-A 30 30 1.41 1.4Y
May 01, 2009 DIST-A 30 30 1.41 1.4Y
Apr 01, 2009 DIST-A 30 30 1.41 1.4Y
Mar 01, 2009 DIST-A 30 30 1.36 1.4Y
Feb 01, 2009 DIST-A 30 30 1.4 1.4Y
Jan 01, 2009 DIST-A 30 30 1.4 1.4Y
Jan 01, 2009 DIST-A 30 30 1.42 1.4Y
Dec 01, 2008 DIST-A 30 30 1.29 1.4Y
Dec 01, 2008 DIST-A 30 30 1.3 1.4Y
Nov 01, 2008 DIST-A 30 30 1.4 1.4Y
Nov 01, 2008 DIST-A 30 30 1.38 1.4Y
Oct 01, 2008 DIST-A 30 30 1.31 1.4Y
Oct 01, 2008 DIST-A 30 30 1.31 1.4Y
Sep 01, 2008 DIST-A 30 30 1.4 1.4Y
Sep 01, 2008 DIST-A 30 30 1.36 1.4Y
Aug 01, 2008 DIST-A 30 30 1.36 1.4Y
Aug 01, 2008 DIST-A 30 0 1.4Y
Jul 01, 2008 DIST-A 30 0 1.4Y
Jul 01, 2008 DIST-A 30 30 1.66 1.4Y
Jun 01, 2008 DIST-A 30 30 1.61 1.4Y
Jun 01, 2008 DIST-A 33 11 1.26 1.4Y
May 01, 2008 DIST-A 30 0 1.4Y
May 01, 2008 DIST-A 30 30 1.55 1.4Y
Apr 01, 2008 DIST-A 30 30 1.45 1.4Y
Apr 01, 2008 DIST-A 30 0 1.4Y
Mar 01, 2008 DIST-A 30 0 1.4Y
Mar 01, 2008 DIST-A 30 30 1.49 1.4Y
Feb 01, 2008 DIST-A 30 30 1.43 1.4Y
Feb 01, 2008 DIST-A 30 0 1.4Y
Jan 01, 2008 DIST-A 30 0 1.4Y
Jan 01, 2008 DIST-A 30 30 1.41 1.4Y
Dec 01, 2007 DIST-A 30 30 1.25 1.4Y
Dec 01, 2007 DIST-A 30 0 1.4Y
Nov 01, 2007 DIST-A 30 0 1.4Y
Nov 01, 2007 DIST-A 30 30 1.25 1.4Y
Oct 01, 2007 DIST-A 30 30 1.37 1.5Y
Oct 01, 2007 DIST-A 30 0 1.5Y
Sep 01, 2007 DIST-A 30 0 1.5Y
Sep 01, 2007 DIST-A 30 30 1.28 1.5Y
Aug 01, 2007 DIST-A 30 30 1.43 1.5Y
Aug 01, 2007 DIST-A 30 0 1.5Y
Jul 01, 2007 DIST-A 30 0 1.5Y
Jul 01, 2007 DIST-A 30 30 1.42 1.5Y
Jun 01, 2007 DIST-A 30 30 1.50 1.5Y
Jun 01, 2007 DIST-A 30 0 1.5Y
May 01, 2007 DIST-A 30 0 1.5Y
May 01, 2007 DIST-A 30 30 1.58 1.5Y
Apr 01, 2007 DIST-A 30 30 1.58 1.5Y
Apr 01, 2007 DIST-A 30 0 1.5Y
Mar 01, 2007 DIST-A 30 0 1.4Y
Mar 01, 2007 DIST-A 0 30 1.56 1.4Y
Feb 01, 2007 DIST-A 30 30 1.53 1.4Y
Feb 01, 2007 DIST-A 30 0 1.4Y
Jan 01, 2007 DIST-A 30 0 1.4Y
Jan 01, 2007 DIST-A 30 30 1.45 1.4Y
Dec 01, 2006 DIST-A 0 30 1.45 1.3Y
Dec 01, 2006 DIST-A 30 0 1.3Y
Nov 01, 2006 DIST-A 30 0 1.3Y
Nov 01, 2006 DIST-A 30 30 1.30 1.3Y
Oct 01, 2006 DIST-A 30 30 1.49 1.3Y
Oct 01, 2006 DIST-A 30 0 1.3Y
Sep 01, 2006 DIST-A 30 0 1.3Y
Aug 01, 2006 DIST-A 30 0 1.3Y
Aug 01, 2006 DIST-A 30 30 1.45 1.3Y
Jul 01, 2006 DIST-A 30 30 1.37 1.3Y
Jul 01, 2006 DIST-A 30 0 1.3Y
Jun 01, 2006 DIST-A 30 0 1.3Y
Jun 01, 2006 DIST-A 30 30 1.38 1.3Y
May 01, 2006 DIST-A 30 30 1.44 1.3Y
May 01, 2006 DIST-A 30 0 1.3Y
Apr 01, 2006 DIST-A 30 0 1.3Y
Apr 01, 2006 DIST-A 30 30 1.28 1.3Y
Mar 01, 2006 DIST-A 30 30 1.25 1.3Y
Mar 01, 2006 DIST-A 30 0 1.3Y
Feb 01, 2006 DIST-A 30 0 1.3Y
Feb 01, 2006 DIST-A 30 30 1.19 1.3Y
Jan 01, 2006 DIST-A 30 30 1.23 1.3Y
Jan 01, 2006 DIST-A 30 0 1.3Y
Dec 01, 2005 DIST-A 25 0 1.3Y
Dec 01, 2005 DIST-A 25 25 1.25 1.3Y
Nov 01, 2005 DIST-A 25 25 1.31 1.4Y
Nov 01, 2005 DIST-A 25 0 1.4Y
Oct 01, 2005 DIST-A 25 0 1.4Y
Oct 01, 2005 DIST-A 25 25 1.31 1.4Y
Sep 01, 2005 DIST-A 25 25 1.45 1.4Y
Sep 01, 2005 DIST-A 25 0 1.4Y
Aug 01, 2005 DIST-A 25 0 1.4Y
Aug 01, 2005 DIST-A 25 25 1.45 1.4Y
Jul 01, 2005 DIST-A 25 25 1.45 1.3Y
Jul 01, 2005 DIST-A 25 0 1.3Y
Jun 01, 2005 DIST-A 25 0 1.3Y
Jun 01, 2005 DIST-A 25 25 1.41 1.3Y
May 01, 2005 DIST-A 25 25 1.29 1.3Y
May 01, 2005 DIST-A 25 0 1.3Y
Apr 01, 2005 DIST-A 25 0 1.3Y
Apr 01, 2005 DIST-A 25 25 1.37 1.3Y
Mar 01, 2005 DIST-A 25 25 1.29 1.3Y
Mar 01, 2005 DIST-A 25 0 1.3Y
Feb 01, 2005 DIST-A 25 0 1.3Y
Feb 01, 2005 DIST-A 25 25 1.23 1.3Y
Jan 01, 2005 DIST-A 25 25 1.31 1.4Y
Jan 01, 2005 DIST-A 25 0 1.4Y
Dec 01, 2004 DIST-A 25 0 1.4Y
Dec 01, 2004 DIST-A 25 25 01.38 1.4Y
Nov 01, 2004 DIST-A 25 25 1.34 1.4Y
Nov 01, 2004 DIST-A 25 0 1.4Y
Oct 01, 2004 DIST-A 25 0 1.4Y
Oct 01, 2004 DIST-A 25 25 1.34 1.4Y
Sep 01, 2004 DIST-A 25 25 1.40 1.4Y
Sep 01, 2004 DIST-A 25 0 1.4Y
 



More information for this water system: SDWIS ID 4081
System Info  ::  Report for Lenders  ::  Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Contacts & Advisories  ::  Site Visits  ::  Public Notice
Coliform Summary  ::  Coliform Results  ::  Coliform Schedules  ::  LT2  ::  GW/GWUDI Source Details  ::  Plan Review  ::  Annual Fee
Chemical Summary  ::  Chemical Results  ::  Chemical Schedules  ::  Chemical Schedule Summary  ::  Arsenic RAA  ::  Cyanotoxins  ::  PFAS
Lead & Copper  ::  DBP Sample Sites  ::  FANLs  ::  MRDL  ::  GWR 4-Log  ::  Turbidity  ::  SWTR  ::  LRAA  ::  DW Source Protection
New! Visit our new Drinking Water Source Protection page.
Information for all water systems:
Water System Inventory  ::  Water System Surveys  ::  Outstanding Performers  ::  Treatment Plant Inspections  ::  Treatment  ::  Plan Reviews
Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Deficiencies  ::  System Scores  ::  Exceedances  ::  Public Notices  ::  Service Lines
Water Advisories  ::  Contact Reports  ::  Cyanotoxins  ::  PFAS  ::  Post-wildfire VOCs  ::  Fluoride  ::  Certification List  ::  DW Source Protection
Introduction  ::  Data Search Options  ::  Water System Search  ::  DWS Home  ::  DWS Rules
Need help? Email Drinking Water Services for assistance.Staff/Partner Login