OHA Drinking Water Services
OR41
PWS ID: 94713 ---- COLUMBIA RIDGE LANDFILL/RECYCL

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 LEAD & COPPER notes3 Years01/01/2028 - 12/31/2028   5 08/20/2025
  Seasonal sampling period:   06/01   thru   09/30
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6)DI(2-ETHYLHEXYL) PHTHALATE  Yearly01/01/2026 - 12/31/2026 286 1 incomplete 10/15/2025
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6) ARSENIC  9 Years01/01/2020 - 12/31/2028 1,017 1 done 04/06/2022
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6) IOC notes9 Years01/01/2020 - 12/31/2028 1,017 1 done 04/06/2022
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6) NITRATE  Yearly 01/01/2026 - 12/31/2026 286 1 incomplete08/20/2025
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6) NITRITE notes9 Years01/01/2020 - 12/31/2028 1,017 1 done 04/06/2022
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6) PFAS notes6 Months 01/01/2026 - 06/30/2026 102 1 incomplete
  Initial monitoring - 2 samples only
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6) SOC  3 Years 01/01/2026 - 12/31/2028 1,017 1 incomplete10/15/2025
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6) VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,017 1 incomplete10/15/2025

6  secs
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Expired Schedules
Facility
ID
Analyte or Group    Sampling
Interval
Start End Samples
Required
   Notes
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6)ARSENIC  3 Years01/01/200212/31/20101
EP-A  EP FOR WELLFIELD (WELLS #1, #2, #6)DI(2-ETHYLHEXYL) PHTHALATE   Quarterly07/01/202206/30/20231

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