OHA Drinking Water Services
OR41
PWS ID: 00878 ---- TIGARD, CITY OF
System Type: C    Population: 62,500


Current Open Coliform Sample Schedule
(subject to change based upon future test results)
DIST-A:  70 Routine sample(s)  per Month to be taken beginning 01/01/2020 -
GWR:  SRC-HA:  1 Assessment sample(s)  per Year to be taken beginning 01/01/2012 -
GWR:  SRC-DA:  1 Assessment sample(s)  per Year to be taken beginning 01/01/2012 -
GWR:  SRC-CB:  1 Assessment sample(s)  per Year to be taken beginning 01/01/2012 -

(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:  60 Routine sample(s) per Month to be taken   09/01/2006 - 12/31/2019  at DIST-A  
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GWR:  3 Triggered sample(s) to be taken and reported  10/02/2017 - 10/13/2017
       1 at SRC-DA - WELL #2
       1 at SRC-HA - ASR WELL 2
       1 at SRC-CB - ASR WELL 1
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   10/03/2017 - 10/13/2017  at DIST-A  
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GWR:  3 Triggered sample(s) to be taken and reported  09/25/2017 - 10/06/2017
       1 at SRC-DA - WELL #2
       1 at SRC-HA - ASR WELL 2
       1 at SRC-CB - ASR WELL 1
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   09/26/2017 - 10/06/2017  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   02/11/2015 - 02/25/2015  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   10/09/2014 - 10/23/2014  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  10/08/2014 - 10/23/2014
       1 at SRC-DA - WELL #2
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   11/20/2012 - 12/04/2012  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   06/26/2012 - 07/10/2012  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  08/16/2011 - 08/31/2011  at SRC-DA  WELL #2
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GWR:  1 Triggered sample(s) to be taken and reported  08/16/2011 - 08/31/2011  at SRC-CB  ASR WELL 1
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   08/17/2011 - 08/31/2011  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   07/19/2011 - 08/02/2011  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   01/25/2011 - 02/08/2011  at DIST-A  
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GWR:  1 Assessment sample(s) per Month to be taken   01/01/2010 - 12/31/2010  at SRC-DA  WELL #2
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   10/27/2009 - 11/10/2009  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   12/06/2006 - 12/20/2006  at DIST-A  
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TCR:  50 Routine sample(s) per Month to be taken   06/01/2002 - 08/31/2006  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   05/10/2005 - 05/24/2005  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   05/10/2005 - 05/24/2005  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   10/12/2004 - 10/26/2004  at DIST-A  
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   11/26/2002 - 12/10/2002  at DIST-A  
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TCR:  1 Routine sample(s) per Month to be taken   01/01/2002 - 05/31/2002  at DIST-A  
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TCR:  40 Routine sample(s) per Month to be taken   01/01/1991 - 12/31/2001  at DIST-A  
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Hide schedules prior to 2021


Instructions and Notes
  1. If no prior sample schedules appear, then no prior schedules exist within the database.
  2. 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.
  3. 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:
    DRINKING WATER SERVICES
    Nicole Alfafara
    (503) 278-1531




More information for this water system: SDWIS ID 4076
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