Current Open Coliform Sample Schedule
(subject to change based upon future test results)
(A begin date of 01/01/1991 indicates the year the Total Coliform Rule was established)
Public water systems that use chlorine or chloramines must measure the
residual disinfectant level at the same points in the distribution system and at the same time when total coliforms are sampled.
Repeat, Temporary Routine, and Prior Coliform Sample Schedules
(Schedules in bold reflect current schedules)
TCR: 1 Routine sample(s) per Month to be taken 04/01/2016 - 09/30/2020 at DIST-A
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GWR: 1 Triggered sample(s) to be taken and reported 06/16/2020 - 06/27/2020
1 at SRC-AA - WELL
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TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/17/2020 - 06/27/2020 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2014 - 03/31/2016 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2013 - 09/30/2014 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 10/01/2012 - 10/31/2012 at DIST-A
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GWR: 1 Triggered sample(s) to be taken and reported 09/16/2012 - 10/01/2012
1 at SRC-AA - WELL
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 09/17/2012 - 10/01/2012 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 09/01/2012 - 09/30/2012 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2012 - 08/31/2012 at DIST-A
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GWR: 1 Triggered sample(s) to be taken and reported 08/06/2012 - 08/21/2012
1 at SRC-AA - WELL
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 08/07/2012 - 08/21/2012 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 10/01/2011 - 10/31/2011 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 09/01/2011 - 09/30/2011 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 09/02/2011 - 09/16/2011 at DIST-A
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GWR: 1 Triggered sample(s) to be taken and reported 09/01/2011 - 09/16/2011 at SRC-AA WELL
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2010 - 08/31/2011 at DIST-A
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GWR: 1 Triggered sample(s) to be taken and reported 08/01/2011 - 08/16/2011 at SRC-AA WELL
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 08/02/2011 - 08/16/2011 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 09/01/2010 - 09/30/2010 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 08/01/2010 - 08/30/2010 at DIST-A
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GWR: 1 Triggered sample(s) to be taken and reported 08/02/2010 - 08/16/2010 at SRC-AA WELL
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TCR: 5 Temporary Routine sample(s) per Month to be taken 07/01/2010 - 07/31/2010 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2009 - 06/30/2010 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/08/2010 - 06/22/2010 at DIST-A
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GWR: 1 Triggered sample(s) to be taken and reported 06/07/2010 - 06/21/2010 at SRC-AA WELL
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TCR: 5 Temporary Routine sample(s) per Month to be taken 09/01/2009 - 09/30/2009 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2008 - 08/31/2009 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 08/04/2009 - 08/18/2009 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 09/01/2008 - 09/30/2008 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 07/01/2008 - 08/31/2008 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 08/05/2008 - 08/19/2008 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 06/01/2008 - 06/30/2008 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 05/01/2008 - 05/31/2008 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 04/01/2008 - 04/30/2008 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2006 - 09/30/2007 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 09/13/2007 - 09/27/2007 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 07/01/2006 - 09/30/2006 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 07/01/2006 - 07/31/2006 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 11/01/2005 - 06/30/2006 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/02/2006 - 06/16/2006 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 10/01/2005 - 10/31/2005 at DIST-A
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TCR: 1 Routine sample(s) per Month to be taken 09/01/2005 - 09/30/2005 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 09/09/2005 - 09/23/2005 at DIST-A
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TCR: 1 Routine sample(s) per Month to be taken 08/01/2005 - 08/31/2005 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 07/01/2005 - 07/31/2005 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2004 - 06/30/2005 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/02/2005 - 06/16/2005 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 08/01/2004 - 08/31/2004 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2003 - 07/31/2004 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 07/06/2004 - 07/20/2004 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 07/01/2003 - 07/31/2003 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2001 - 06/30/2003 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/11/2003 - 06/25/2003 at DIST-A
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TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 07/11/2001 - 10/18/2001 at DIST-A
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TCR: 5 Temporary Routine sample(s) per Month to be taken 08/01/2001 - 08/31/2001 at DIST-A
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TCR: 1 Routine sample(s) per Quarter to be taken 01/01/1991 - 07/31/2001 at DIST-A
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Hide schedules prior to 2021
Instructions and Notes
- If no prior sample schedules appear, then no prior schedules exist within the database.
- Schedules for Oregon very small systems might not appear. If the system is active, samples must be collected for the presence of coliform bacteria once per month or once per quarter depending on water type, seasonal operating cycle, or previous sampling results.
- If a sample tests positive for total coliform or E. coli, a minimum of 3 repeat samples must be collected. At water systems where quarterly monitoring takes place, 3 routine samples must be collected the month following one in which a routine sample tested positive for the presence of total coliform or E. coli.
Any time a sample tests positive for the presence of coliform bacteria, the system's operator should contact their regulator. For this water system, that is:
CLACKAMAS CO HEALTH DEPT
Joel Ferguson/Julie Hamilton/Kim Holtman
(503) 742-5367,(971) 334-0593
