OHA Drinking Water Services
OR41
PWS ID: 00304 ---- ALDERWOOD WATER DEV CO

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 LEAD & COPPER  6 Months 01/01/2026 - 06/30/2026 67 5 incomplete11/30/2025
DIST-A  Distribution System STAGE 2 DBP  Quarterly 04/01/2026 - 06/30/2026 67 1 incomplete10/21/2025
EP-A  EP FOR WOAHINK LAKE ARSENIC  9 Years 01/01/2020 - 12/31/2028 982 1 incomplete09/20/2016
EP-A  EP FOR WOAHINK LAKE IOC notes9 Years 01/01/2023 - 12/31/2031 2,077 1 incomplete09/20/2016
EP-A  EP FOR WOAHINK LAKE NITRATE  Yearly 01/01/2026 - 12/31/2026 251 1 incomplete02/04/2025
EP-A  EP FOR WOAHINK LAKE NITRITE notes9 Years 01/01/2023 - 12/31/2031 2,077 1 incomplete09/20/2016
EP-A  EP FOR WOAHINK LAKE PFAS notesQuarterly 04/01/2026 - 06/30/2026 67 1 incomplete12/17/2025
  Initial monitoring - 4 quarters only
EP-A  EP FOR WOAHINK LAKE RAD - GROSS ALPHA notes9 Years 01/01/2026 - 12/31/2034 3,173 1 incomplete05/06/2025
EP-A  EP FOR WOAHINK LAKE RAD - RADIUM 226/228notes9 Years 01/01/2026 - 12/31/2034 3,173 1 incomplete05/06/2025
EP-A  EP FOR WOAHINK LAKE RAD - URANIUM notes9 Years 01/01/2026 - 12/31/2034 3,173 1 incomplete05/06/2025
EP-A  EP FOR WOAHINK LAKE SOC  3 Years 01/01/2026 - 12/31/2028 982 1 incomplete10/21/2025
EP-A  EP FOR WOAHINK LAKE VOLATILE ORGANICS  Yearly 01/01/2026 - 12/31/2026 251 1 incomplete10/21/2025

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Expired Schedules
Facility
ID
Analyte or Group    Sampling
Interval
Start End Samples
Required
   Notes
DIST-A  Distribution SystemASBESTOS, DIST  9 Years01/01/200212/31/20181removed asbestos pipe -12/10/2019
DIST-A  Distribution SystemHAA5 & TTHM  Yearly01/01/200412/31/20131Sample between June 1 and Sept. 30.
DIST-A  Distribution SystemLEAD & COPPER  3 Years01/01/200212/31/20235Sample Between June 1st and Sept 30th
DIST-A  Distribution SystemSTAGE 2 DBP  Quarterly01/01/201512/31/20211Increased monitoring due to results over the MCL for TTHM. Collect one dual sample set every quarter.
DIST-A  Distribution SystemSTAGE 2 DBP  Yearly01/01/201412/31/20141Sample in August
DIST-A  Distribution SystemSTAGE 2 DBP  Yearly01/01/202209/30/20241Collect one dual sample set every August at 5600 Alder Ct.
EP-A  EP FOR WOAHINK LAKEARSENIC  Yearly01/01/200212/31/20081
EP-A  EP FOR WOAHINK LAKEIOC  Yearly01/01/200212/31/20041
EP-A  EP FOR WOAHINK LAKENITRITE  3 Years01/01/200212/31/20041
SRC-AA  WOAHINK LAKECYANOTOXINS  2 Weeks07/15/201801/24/20191

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