OHA Drinking Water Services
OR41
PWS ID: 00665 ---- TUALATIN VALLEY WATER DISTRICT

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 notesYearly 01/01/2026 - 12/31/2026 257 50 incomplete07/08/2025
  Seasonal sampling period:   06/01   thru   09/30
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP notesQuarterly 04/01/2026 - 06/30/2026 73 8 incomplete03/03/2026
EP-C  EP FOR WELL 1 - GRABHORN ASR ARSENIC notes9 Years 01/01/2026 - 12/31/2034 3,179 1 incomplete09/26/2023
EP-C  EP FOR WELL 1 - GRABHORN ASR IOC notes9 Years 01/01/2026 - 12/31/2034 3,179 1 incomplete09/26/2023
EP-C  EP FOR WELL 1 - GRABHORN ASR NITRATE  Yearly 01/01/2026 - 12/31/2026 257 1 incomplete09/26/2023
EP-C  EP FOR WELL 1 - GRABHORN ASR NITRITE notes9 Years 01/01/2026 - 12/31/2034 3,179 1 incomplete09/26/2023
EP-C  EP FOR WELL 1 - GRABHORN ASR PFAS notesQuarterly 04/01/2026 - 06/30/2026 73 1 incomplete
  Initial monitoring - 4 quarters only
EP-C  EP FOR WELL 1 - GRABHORN ASR RAD - GROSS ALPHA notes9 Years01/01/2020 - 12/31/2028 988 1 done 11/04/2020
EP-C  EP FOR WELL 1 - GRABHORN ASR RAD - RADIUM 226/228notes9 Years 01/01/2023 - 12/31/2031 2,083 1 incomplete11/04/2020
EP-C  EP FOR WELL 1 - GRABHORN ASR RAD - URANIUM notes9 Years 01/01/2023 - 12/31/2031 2,083 1 incomplete11/04/2020
EP-C  EP FOR WELL 1 - GRABHORN ASR SOC notes3 Years 01/01/2026 - 12/31/2028 988 2 incomplete10/16/2023
EP-C  EP FOR WELL 1 - GRABHORN ASR VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 988 1 incomplete10/16/2023

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