Current Open Coliform Sample Schedule
(subject to change based upon future test results)
DIST-A: 1 Routine sample(s) per Month to be taken beginning 01/01/2023 -
(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)
GWR: 1 Triggered sample(s) to be taken and reported 07/23/2024 - 08/03/2024
1 at SRC-AA - WELL
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 07/24/2024 - 08/03/2024 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 04/16/2024 - 04/27/2024
1 at SRC-AA - WELL
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 04/17/2024 - 04/27/2024 at DIST-A
-----
TCR: 1 Routine sample(s) per Month to be taken 06/01/2022 - 12/31/2022 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 06/28/2022 - 07/09/2022
1 at SRC-AA - WELL
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 06/29/2022 - 07/09/2022 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 07/01/2021 - 03/31/2022 at DIST-A
-----
TCR: 3 Temporary Routine sample(s) per Month to be taken 06/01/2021 - 06/30/2021 at DIST-A
-----
GWR: 1 Triggered sample(s) to be taken and reported 05/27/2021 - 06/07/2021
1 at SRC-AA - WELL
-----
TCR: 3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported 05/28/2021 - 06/07/2021 at DIST-A
-----
TCR: 1 Routine sample(s) per Quarter to be taken 04/01/2021 - 05/31/2021 at DIST-A
-----
Show 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:
WASHINGTON CO HEALTH DEPT
Larry Fenster/Ashley Davis
(503) 846-3866
