OHA Drinking Water Services
OR41
PWS ID: 00906 ---- TUALATIN, CITY OF

See also: Coliform Schedules

Chemical Sampling Schedule Status
Facility
ID
Analyte or Group   Sampling
Interval
Monitoring Period Days
Until
End
Samples
Required
Samples
Received
Last
Sample
Date
Start End
DIST-A  DISTRIBUTION SYSTEM ASBESTOS, DIST notes9 Years 01/01/2020 - 12/31/2028 983 1 incomplete08/20/2019
DIST-A  DISTRIBUTION SYSTEM LEAD & COPPER notesYearly 01/01/2026 - 12/31/2026 252 30 incomplete06/27/2025
  Seasonal sampling period:   06/01   thru   09/30
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP notesQuarterly 04/01/2026 - 06/30/2026 68 4 incomplete01/20/2026

8  secs
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Expired Schedules
Facility
ID
Analyte or Group    Sampling
Interval
Start End Samples
Required
   Notes
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Quarterly01/01/200406/30/20084
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Quarterly07/01/200803/31/20121Schedule Reflects Monitoring Reduction Granted
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months01/01/200206/30/2017100Schedule Reflects PWB Joint Monitoring Plan
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months07/01/201706/30/201960
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months07/01/202212/31/202360Collect samples from cold water, drinking water taps.
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  Yearly01/01/202012/31/202130sample between June 1 and Sept 30
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Quarterly04/01/201203/31/20134Sample in Jan, April, July & Oct
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Quarterly04/01/201303/31/20142Sample in Jan, April, July & Oct
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Quarterly04/01/201403/31/20154Sample in April, July, Oct, and Jan
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Quarterly04/01/201506/30/20152Sample in April, July, Oct and January
EP-B  EP FOR 108TH ASR WELLARSENIC  3 Years01/01/200812/31/20161
EP-B  EP FOR 108TH ASR WELLARSENIC  9 Years01/01/201712/31/20241Schedule Reflects Monitoring Reduction Granted
EP-B  EP FOR 108TH ASR WELLIOC  3 Years01/01/200812/31/20161
EP-B  EP FOR 108TH ASR WELLIOC  9 Years01/01/201712/31/20241Schedule Reflects Monitoring Reduction Granted
EP-B  EP FOR 108TH ASR WELLNITRATE  Yearly01/01/200912/31/20241
EP-B  EP FOR 108TH ASR WELLNITRITE  3 Years01/01/200812/31/20161
EP-B  EP FOR 108TH ASR WELLNITRITE  9 Years01/01/201712/31/20241Schedule Reflects Monitoring Reduction Granted
EP-B  EP FOR 108TH ASR WELLRAD - GROSS ALPHA  9 Years01/01/201412/31/20241Schedule Reflects Monitoring Reduction Granted
EP-B  EP FOR 108TH ASR WELLRAD - GROSS ALPHA  Quarterly04/01/200909/30/20111
EP-B  EP FOR 108TH ASR WELLRAD - RADIUM 226/228  9 Years01/01/201412/31/20241Schedule Reflects Monitoring Reduction Granted
EP-B  EP FOR 108TH ASR WELLRAD - RADIUM 226/228  Quarterly04/01/200909/30/20111
EP-B  EP FOR 108TH ASR WELLRAD - URANIUM  6 Years01/01/202312/31/20241
EP-B  EP FOR 108TH ASR WELLRAD - URANIUM  9 Years01/01/201412/31/20221Schedule Reflects Monitoring Reduction Granted
EP-B  EP FOR 108TH ASR WELLRAD - URANIUM  Quarterly04/01/200910/01/20121
EP-B  EP FOR 108TH ASR WELLSOC  3 Years01/01/201412/31/202422 Consec. QT Samples
EP-B  EP FOR 108TH ASR WELLSOC  Yearly01/01/200912/31/20131
EP-B  EP FOR 108TH ASR WELLVOLATILE ORGANICS  3 Years01/01/201412/31/20241
EP-B  EP FOR 108TH ASR WELLVOLATILE ORGANICS  Yearly01/01/200912/31/20131

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