OHA Drinking Water Services
OR41
PWS ID: 93427 ---- COLUMBIA RIVER NITROGEN, LLC

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 06/19/2025
  Seasonal sampling period:   06/01   thru   09/30
DIST-A  Distribution System STAGE 2 DBP notes3 Years01/01/2026 - 12/31/2026   1incomplete08/09/2023
  Seasonal sampling period:   08/01   thru   08/31
EP-A  EP FOR WELL #2 ARSENIC  9 Years 01/01/2020 - 12/31/2028 1,020 1 incomplete02/05/2019
EP-A  EP FOR WELL #2 IOC notes9 Years 01/01/2020 - 12/31/2028 1,020 1 incomplete02/05/2019
EP-A  EP FOR WELL #2 NITRATE  Yearly 01/01/2026 - 12/31/2026 289 1 incomplete02/10/2025
EP-A  EP FOR WELL #2 NITRITE notes9 Years 01/01/2020 - 12/31/2028 1,020 1 incomplete02/05/2019
EP-A  EP FOR WELL #2 PFAS notes6 Months 01/01/2026 - 06/30/2026 105 1 incomplete
  Initial monitoring - 2 samples only
EP-A  EP FOR WELL #2 SOC  3 Years 01/01/2026 - 12/31/2028 1,020 1 incomplete10/10/2023
EP-A  EP FOR WELL #2 VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,020 1 incomplete10/10/2023

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Expired Schedules
Facility
ID
Analyte or Group    Sampling
Interval
Start End Samples
Required
   Notes
DIST-A  Distribution SystemHAA5 & TTHM  3 Years01/01/200512/31/20131Sample between June 1 and Sept. 30.
DIST-A  Distribution SystemHAA5 & TTHM  Yearly01/01/200412/31/20041Sample Between June 1st and Sept 30th Each Year
DIST-A  Distribution SystemLEAD & COPPER  3 Years01/01/200212/31/20105Sample Between June 1st and Sept 30th
DIST-A  Distribution SystemLEAD & COPPER  6 Months07/01/201106/30/20125
DIST-A  Distribution SystemLEAD & COPPER  Yearly01/01/201312/31/20175Sample between June 1st and Sept 30th
EP-A  EP FOR WELL #2ARSENIC  3 Years01/01/200212/31/20101

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