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 3,222 1 incomplete07/28/2021
EP-A  EP FOR HOLSTEIN WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,031 1 done 07/28/2021
EP-A  EP FOR HOLSTEIN WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 300 1 incomplete07/15/2025
EP-A  EP FOR HOLSTEIN WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,031 1 done 07/28/2021
EP-A  EP FOR HOLSTEIN WELL PFAS notes6 Months 01/01/2026 - 06/30/2026 116 1 incomplete
  Initial monitoring - 2 samples only
EP-A  EP FOR HOLSTEIN WELL SOC  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete02/09/2023
EP-A  EP FOR HOLSTEIN WELL VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete07/17/2025
EP-B  EP FOR JERSEY WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 300 1 incomplete07/15/2025
EP-B  EP FOR JERSEY WELL PFAS notes6 Months 01/01/2026 - 06/30/2026 116 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 3,222 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS IOC notes9 Years 01/01/2026 - 12/31/2034 3,222 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS NITRATE  Yearly 01/01/2026 - 12/31/2026 300 1 incomplete07/15/2025
EP-C  EP FOR SHOP AND 6 MILE WELLS NITRITE notes9 Years 01/01/2026 - 12/31/2034 3,222 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS PFAS notes6 Months 01/01/2026 - 06/30/2026 116 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 1,031 1 incomplete02/09/2023
EP-C  EP FOR SHOP AND 6 MILE WELLS VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete02/09/2023
EP-D  EP FOR WELL #5 ARSENIC  9 Years 01/01/2026 - 12/31/2034 3,222 1 incomplete06/05/2023
EP-D  EP FOR WELL #5 IOC  9 Years 01/01/2026 - 12/31/2034 3,222 1 incomplete06/05/2023
EP-D  EP FOR WELL #5 NITRATE  Yearly 01/01/2026 - 12/31/2026 300 1 incomplete07/15/2025
EP-D  EP FOR WELL #5 NITRITE  9 Years 01/01/2026 - 12/31/2034 3,222 1 incomplete06/05/2023
EP-D  EP FOR WELL #5 PFAS notes6 Months 01/01/2026 - 06/30/2026 116 1 incomplete
  Initial monitoring - 2 samples only
EP-D  EP FOR WELL #5 SOC  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete07/17/2025
EP-D  EP FOR WELL #5 VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete07/17/2025
EP-E  EP FOR WELL #7 ARSENIC  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete06/05/2023
EP-E  EP FOR WELL #7 IOC  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete06/05/2023
EP-E  EP FOR WELL #7 NITRATE  Yearly 01/01/2026 - 12/31/2026 300 1 incomplete07/17/2025
EP-E  EP FOR WELL #7 NITRITE  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete06/05/2023
EP-E  EP FOR WELL #7 PFAS notes6 Months 01/01/2026 - 06/30/2026 116 1 incomplete
  Initial monitoring - 2 samples only
EP-E  EP FOR WELL #7 SOC  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete12/19/2023
EP-E  EP FOR WELL #7 VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,031 1 incomplete12/19/2023

5  secs
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Expired Schedules
Facility
ID		 Analyte or Group    Sampling
Interval		 Start End Samples
Required		    Notes
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  3 Years02/01/200512/31/20131Sample between June 1 and Sept. 30.
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Yearly01/01/200412/31/20041Sample between June and September
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months01/01/200212/31/20025
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  Yearly01/01/200312/31/20065Sample Between June 1st and Sept 30th
EP-A  EP FOR HOLSTEIN WELLARSENIC  3 Years01/01/200212/31/20161
EP-D  EP FOR WELL #5ARSENIC  3 Years01/01/201412/31/20251
EP-D  EP FOR WELL #5IOC  3 Years01/01/201412/31/20251
EP-D  EP FOR WELL #5NITRITE  3 Years01/01/201412/31/20251
EP-D  EP FOR WELL #5SOC  Yearly01/01/201512/31/20191
EP-D  EP FOR WELL #5VOLATILE ORGANICS  Yearly01/01/201512/31/20191
EP-E  EP FOR WELL #7SOC  Yearly01/01/201812/31/20201
EP-E  EP FOR WELL #7VOLATILE ORGANICS  Yearly01/01/201812/31/20201

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