Current Open Coliform Sample Schedule
(subject to change based upon future test results)
DIST-A: 1 Routine sample(s) per Quarter to be taken beginning 01/01/2025 -
(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 Quarter to be taken 10/01/2024 - 12/31/2024 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 04/01/2018 - 09/30/2024 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 09/18/2024 - 09/29/2024
1 at SRC-AA - WELL
-----
TCR: 1 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 09/19/2024 - 09/29/2024 at DIST-A
-----
TCR: 3 Temporary Routine sample(s) per Month to be taken 03/01/2018 - 03/31/2018 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2018 - 02/28/2018 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 02/02/2018 - 02/13/2018
1 at SRC-AA - WELL
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 02/03/2018 - 02/13/2018 at DIST-A
-----
TCR: 1 Routine sample(s) per Month to be taken 11/01/2017 - 11/30/2017 at DIST-A
-----
TCR: 3 Temporary Routine sample(s) per Month to be taken 10/01/2017 - 10/31/2017 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2014 - 09/30/2017 at DIST-A
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 09/10/2017 - 09/20/2017 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 09/09/2017 - 09/20/2017
1 at SRC-AA - WELL
-----
TCR: 5 Temporary Routine sample(s) per Month to be taken 08/01/2014 - 08/31/2014 at DIST-A
-----
TCR: 5 Temporary Routine sample(s) per Month to be taken 07/01/2014 - 07/31/2014 at DIST-A
-----
TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 07/09/2014 - 07/23/2014 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2011 - 06/30/2014 at DIST-A
-----
TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/05/2014 - 06/19/2014 at DIST-A
-----
GWR: 1 Assessment sample(s) Year 01/01/2012 - 12/31/2012 at SRC-AA WELL
-----
TCR: 5 Temporary Routine sample(s) per Month to be taken 12/01/2010 - 12/31/2010 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2010 - 11/30/2010 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 11/09/2010 - 11/24/2010 at SRC-AA WELL
-----
TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 11/09/2010 - 11/23/2010 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2008 - 12/31/2009 at DIST-A
-----
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:
MULTNOMAH CO ENV HEALTH
Jenifer George/Jeff Martin/Shannon Fost/Rhonda Robb
(971) 219-2523
