OHA Drinking Water Services
OR41
PWS ID: 95174 ---- COLUMBIA RIVER DAIRY

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 Years01/01/2027 - 12/31/2027   5 06/27/2024
  Seasonal sampling period:   06/01   thru   09/30
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP notes3 Years01/01/2026 - 12/31/2026   1incomplete07/31/2023
  Seasonal sampling period:   07/01   thru   07/31
EP-A  EP FOR HOLSTEIN WELL ARSENIC notes9 Years 01/01/2026 - 12/31/2034 3,224 1 incomplete07/28/2021
EP-A  EP FOR HOLSTEIN WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,033 1 done 07/28/2021
EP-A  EP FOR HOLSTEIN WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 302 1 incomplete07/15/2025
EP-A  EP FOR HOLSTEIN WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,033 1 done 07/28/2021
EP-A  EP FOR HOLSTEIN WELL PFAS notes6 Months 01/01/2026 - 06/30/2026 118 1 incomplete
  Initial monitoring - 2 samples only
EP-A  EP FOR HOLSTEIN WELL SOC  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete02/09/2023
EP-A  EP FOR HOLSTEIN WELL VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete07/17/2025
EP-B  EP FOR JERSEY WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 302 1 incomplete07/15/2025
EP-B  EP FOR JERSEY WELL PFAS notes6 Months 01/01/2026 - 06/30/2026 118 1 incomplete
  Initial monitoring - 2 samples only
EP-C  EP FOR SHOP AND 6 MILE WELLS ARSENIC notes9 Years 01/01/2026 - 12/31/2034 3,224 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS IOC notes9 Years 01/01/2026 - 12/31/2034 3,224 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS NITRATE  Yearly 01/01/2026 - 12/31/2026 302 1 incomplete07/15/2025
EP-C  EP FOR SHOP AND 6 MILE WELLS NITRITE notes9 Years 01/01/2026 - 12/31/2034 3,224 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS PFAS notes6 Months 01/01/2026 - 06/30/2026 118 1 incomplete
  Initial monitoring - 2 samples only
EP-C  EP FOR SHOP AND 6 MILE WELLS SOC  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete02/09/2023
EP-D  EP FOR WELL #5 ARSENIC  9 Years 01/01/2026 - 12/31/2034 3,224 1 incomplete06/05/2023
EP-D  EP FOR WELL #5 IOC  9 Years 01/01/2026 - 12/31/2034 3,224 1 incomplete06/05/2023
EP-D  EP FOR WELL #5 NITRATE  Yearly 01/01/2026 - 12/31/2026 302 1 incomplete07/15/2025
EP-D  EP FOR WELL #5 NITRITE  9 Years 01/01/2026 - 12/31/2034 3,224 1 incomplete06/05/2023
EP-D  EP FOR WELL #5 PFAS notes6 Months 01/01/2026 - 06/30/2026 118 1 incomplete
  Initial monitoring - 2 samples only
EP-D  EP FOR WELL #5 SOC  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete07/17/2025
EP-D  EP FOR WELL #5 VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete07/17/2025
EP-E  EP FOR WELL #7 ARSENIC  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete06/05/2023
EP-E  EP FOR WELL #7 IOC  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete06/05/2023
EP-E  EP FOR WELL #7 NITRATE  Yearly 01/01/2026 - 12/31/2026 302 1 incomplete07/17/2025
EP-E  EP FOR WELL #7 NITRITE  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete06/05/2023
EP-E  EP FOR WELL #7 PFAS notes6 Months 01/01/2026 - 06/30/2026 118 1 incomplete
  Initial monitoring - 2 samples only
EP-E  EP FOR WELL #7 SOC  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete12/19/2023
EP-E  EP FOR WELL #7 VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,033 1 incomplete12/19/2023

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