OHA Drinking Water Services
OR41
PWS ID: 00457 ---- LAKE OSWEGO MUNICIPAL WATER

See also: Coliform Schedules  ::  LT2 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 1,429 1 incomplete11/14/2012
DIST-A  DISTRIBUTION SYSTEM LEAD & COPPER notes3 Years01/01/2026 - 12/31/2026   30 08/04/2023
 Seasonal sampling period:  06/01  thru  09/30
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP notesQuarterly 01/01/2025 - 03/31/2025 58 2 incomplete11/08/2024

6  secs
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Expired Schedules
Facility
ID		 Analyte or Group    Sampling
Interval		 Start End Samples
Required		    Notes
CH-A  COMMON HEADER FOR WTP-ATOC & ALKALINITY  Monthly07/01/201912/31/20191
CH-A  COMMON HEADER FOR WTP-ATOTAL ORGANIC CARBON  Monthly01/01/200212/31/20071Raw Water TOC Only Required for Reduction in DBP Monitoring
CH-A  COMMON HEADER FOR WTP-ATOTAL ORGANIC CARBON  Quarterly01/01/200812/31/20181Raw Water TOC Only Required for Reduction in DBP Monitoring
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Quarterly01/01/200212/31/20072Schedule Reflects Monitoring Reduction Granted
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Quarterly01/01/200803/31/20121Schedule Reflects Monitoring Reduction Granted
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  3 Years01/01/200206/30/201330Sample Between June 1st and Sept 30th
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months07/01/201306/30/201460
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Quarterly04/01/201206/30/20224Sample in Feb, May, Aug & Nov
EP-A  EP FOR CLACKAMAS RIVER2,4-D   Quarterly01/01/200812/31/20081If RAA is below MCL in Dec 2008, WS can reduce to an annual schedule
EP-A  EP FOR CLACKAMAS RIVER2,4-D   Quarterly07/01/201312/31/20131
EP-A  EP FOR CLACKAMAS RIVER2,4-D   Yearly01/01/200912/31/20111Sample after first autumnal rains.
EP-A  EP FOR CLACKAMAS RIVERARSENIC  9 Years01/01/200812/31/20161
EP-A  EP FOR CLACKAMAS RIVERARSENIC  Yearly01/01/200212/31/20071
EP-A  EP FOR CLACKAMAS RIVERBROMATE   Monthly12/01/201712/31/20191
EP-A  EP FOR CLACKAMAS RIVERIOC  9 Years01/01/200212/31/20191Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR CLACKAMAS RIVERNITRATE  Yearly01/01/200212/31/20191
EP-A  EP FOR CLACKAMAS RIVERNITRITE  9 Years01/01/200212/31/20191Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR CLACKAMAS RIVERRAD - GROSS ALPHA  9 Years01/01/200812/31/20161Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR CLACKAMAS RIVERRAD - RADIUM 226/228  9 Years01/01/200812/31/20161Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR CLACKAMAS RIVERRAD - URANIUM  9 Years01/01/200812/31/20161Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR CLACKAMAS RIVERSOC  3 Years01/01/200212/31/201322 Consec. QT Samples
EP-A  EP FOR CLACKAMAS RIVERSOC  3 Years01/01/201412/31/201922 Consec. QT Samples
EP-A  EP FOR CLACKAMAS RIVERVOLATILE ORGANICS  Yearly01/01/200212/31/20191
SRC-AA  CLACKAMAS RIVERCYANOTOXINS  2 Weeks07/15/201812/31/20191

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More information for this water system: SDWIS ID 4106
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