OHA Drinking Water Services
OR41
PWS ID: 95664 ---- COLUMBIA AIRGAS

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 12/15/2025
  Seasonal sampling period:   06/01   thru   09/30
EP-A  EP FOR WELL ARSENIC  3 Years 01/01/2026 - 12/31/2028 971 1 incomplete11/03/2025
EP-A  EP FOR WELL IOC  3 Years 01/01/2026 - 12/31/2028 971 1 incomplete11/03/2025
EP-A  EP FOR WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 240 1 incomplete11/03/2025
EP-A  EP FOR WELL NITRITE  3 Years 01/01/2026 - 12/31/2028 971 1 incomplete11/03/2025
EP-A  EP FOR WELL PFAS notes6 Months 01/01/2026 - 06/30/2026 56 1 incomplete
  Initial monitoring - 2 samples only
EP-A  EP FOR WELL SOC  3 Years 01/01/2026 - 12/31/2028 971 1 incomplete11/10/2025
EP-A  EP FOR WELL VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 971 1 incomplete11/03/2025

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Expired Schedules
Facility
ID
Analyte or Group    Sampling
Interval
Start End Samples
Required
   Notes
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months01/01/202212/31/20255Collect samples at cold water, drinking water taps.
EP-A  EP FOR WELLSOC  Yearly01/01/202212/31/20251
EP-A  EP FOR WELLVOLATILE ORGANICS  Yearly01/01/202212/31/20251

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