OHA Drinking Water Services
OR41
PWS ID: 00379 ---- JOINT WATER COMMISSION

See also: Coliform Schedules  ::  LT2 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
CH-A  COMMON HEADER FOR WTP-A TOC & ALKALINITY notesQuarterly 07/01/2025 - 09/30/2025 85 1 incomplete05/14/2025
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP notesYearly 01/01/2025 - 12/31/2025 177 1 incomplete07/02/2024
 Seasonal sampling period:  07/01  thru  07/31
EP-A  EP FOR TUALATIN RIVERHEXACHLOROCYCLOPENTADIENE notesYearly01/01/2025 - 12/31/2025 177 1 done 04/02/2025
EP-A  EP FOR TUALATIN RIVER ARSENIC notes9 Years01/01/2020 - 12/31/2028 1,273 1 done 04/02/2025
EP-A  EP FOR TUALATIN RIVER IOC notes9 Years01/01/2020 - 12/31/2028 1,273 1 done 04/02/2025
EP-A  EP FOR TUALATIN RIVER NITRATE  Yearly01/01/2025 - 12/31/2025 177 1 done 04/02/2025
EP-A  EP FOR TUALATIN RIVER NITRITE notes9 Years01/01/2020 - 12/31/2028 1,273 1 done 04/02/2025
EP-A  EP FOR TUALATIN RIVER RAD - GROSS ALPHA notes9 Years01/01/2017 - 12/31/2025 177 1 done 04/07/2021
EP-A  EP FOR TUALATIN RIVER RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,368 1 incomplete04/07/2021
EP-A  EP FOR TUALATIN RIVER RAD - URANIUM notes9 Years01/01/2017 - 12/31/2025 177 1 done 04/07/2021
EP-A  EP FOR TUALATIN RIVER SOC notes3 Years01/01/2023 - 12/31/2025 177 2 done 04/02/2025
EP-A  EP FOR TUALATIN RIVER VOLATILE ORGANICS  Yearly01/01/2025 - 12/31/2025 177 1 done 04/02/2025
SRC-AA  TUALATIN RIVER CYANOTOXINS  2 Weeks 06/29/2025 - 07/12/2025 5 1 incomplete06/16/2025
 Seasonal sampling period:  05/01  thru  10/31
WTP-A  TP FOR TUALATIN RIVERTOTAL ORGANIC CARBONnotesMonthly07/01/2025 - 07/31/2025 24 1 incomplete 05/14/2025

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More information for this water system: SDWIS ID 3889

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