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 07/01/2024 -
GWR: SRC-AA: 1 Assessment sample(s) per Year to be taken beginning 01/01/2017 -
(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: 3 Temporary Routine sample(s) per Month to be taken 06/01/2024 - 06/30/2024 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2022 - 05/31/2024 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 05/13/2024 - 05/24/2024
1 at SRC-AA - WELL
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 05/14/2024 - 05/24/2024 at DIST-A
-----
TCR: 1 Routine sample(s) per Month to be taken 12/01/2020 - 11/30/2021 at DIST-A
-----
TCR: 1 Routine sample(s) per Month to be taken 11/01/2020 - 11/30/2020 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 10/01/2016 - 09/30/2020 at DIST-A
-----
GWR: 1 Assessment sample(s) per Month to be taken 08/01/2015 - 07/31/2016 at SRC-AA WELL
-----
TCR: 3 Temporary Routine sample(s) per Month to be taken 07/01/2016 - 07/31/2016 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2012 - 06/30/2016 at DIST-A
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/10/2016 - 06/20/2016 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 06/09/2016 - 06/20/2016
1 at SRC-AA - WELL
-----
GWR: 1 Assessment sample(s) Year 01/01/2012 - 12/31/2014 at SRC-AA WELL
-----
TCR: 5 Temporary Routine sample(s) per Month to be taken 10/01/2011 - 10/31/2011 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 09/15/2011 - 09/30/2011 at SRC-AA WELL
-----
TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 09/16/2011 - 09/30/2011 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 01/01/2007 - 09/30/2011 at DIST-A
-----
TCR: 5 Temporary Routine sample(s) per Month to be taken 11/01/2006 - 11/30/2006 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 01/01/1991 - 10/31/2006 at DIST-A
-----
TCR: 4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 10/06/2006 - 10/20/2006 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:
CLACKAMAS CO HEALTH DEPT
Joel Ferguson/Julie Hamilton/Dan Leasure
(503) 742-5367
