OHA Drinking Water Services
OR41
PWS ID: 00869 ---- THE DALLES, CITY OF

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 10/01/2025 - 12/31/2025 21 1 incomplete06/03/2025
DIST-A  Distribution System ASBESTOS, DIST notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 08/08/2022
DIST-A  Distribution System HAA5 & TTHM notesQuarterly 10/01/2025 - 12/31/2025 21 2 incomplete
DIST-A  Distribution System LEAD & COPPER  6 Months 07/01/2025 - 12/31/2025 21 60 incomplete07/12/2024
EP-A  EP FOR SOUTH FORK MILL CREEK ARSENIC notes9 Years01/01/2017 - 12/31/2025 21 1 done 08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK IOC notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK NITRATE  Yearly01/01/2025 - 12/31/2025 21 1 done 08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK NITRITE notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK RAD - GROSS ALPHA  9 Years01/01/2017 - 12/31/2025 21 1 done 08/18/2021
EP-A  EP FOR SOUTH FORK MILL CREEK RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-A  EP FOR SOUTH FORK MILL CREEK RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-A  EP FOR SOUTH FORK MILL CREEK SOC notes3 Years01/01/2023 - 12/31/2025 21 2 done 09/09/2024
EP-A  EP FOR SOUTH FORK MILL CREEK VOLATILE ORGANICS  Yearly01/01/2025 - 12/31/2025 21 1 done 08/25/2025
EP-B  EP FOR LONE PINE WELL ARSENIC notes9 Years01/01/2017 - 12/31/2025 21 1 done 08/25/2025
EP-B  EP FOR LONE PINE WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 08/25/2025
EP-B  EP FOR LONE PINE WELL NITRATE  Yearly01/01/2025 - 12/31/2025 21 1 done 09/23/2025
EP-B  EP FOR LONE PINE WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 09/23/2025
EP-B  EP FOR LONE PINE WELL RAD - GROSS ALPHA  9 Years01/01/2017 - 12/31/2025 21 1 done 08/18/2021
EP-B  EP FOR LONE PINE WELL RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-B  EP FOR LONE PINE WELL RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-B  EP FOR LONE PINE WELL SOC  3 Years01/01/2023 - 12/31/2025 21 2 done 09/09/2024
EP-B  EP FOR LONE PINE WELL VOLATILE ORGANICS  3 Years01/01/2023 - 12/31/2025 21 1 done 08/02/2023
EP-C  EP FOR JORDAN ST WELL ARSENIC notes9 Years01/01/2017 - 12/31/2025 21 1 done 08/25/2025
EP-C  EP FOR JORDAN ST WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 08/25/2025
EP-C  EP FOR JORDAN ST WELL NITRATE  Yearly01/01/2025 - 12/31/2025 21 1 done 09/23/2025
EP-C  EP FOR JORDAN ST WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 09/23/2025
EP-C  EP FOR JORDAN ST WELL RAD - GROSS ALPHA  9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-C  EP FOR JORDAN ST WELL RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-C  EP FOR JORDAN ST WELL RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-C  EP FOR JORDAN ST WELL SOC notes3 Years01/01/2023 - 12/31/2025 21 2 done 09/09/2024
EP-C  EP FOR JORDAN ST WELL VOLATILE ORGANICS  3 Years01/01/2023 - 12/31/2025 21 1 done 08/02/2023
EP-D  EP FOR MARKS WELL ARSENIC notes9 Years01/01/2017 - 12/31/2025 21 1 done 09/23/2025
EP-D  EP FOR MARKS WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 09/23/2025
EP-D  EP FOR MARKS WELL NITRATE  Yearly01/01/2025 - 12/31/2025 21 1 done 09/23/2025
EP-D  EP FOR MARKS WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,117 1 done 09/23/2025
EP-D  EP FOR MARKS WELL RAD - GROSS ALPHA  9 Years01/01/2017 - 12/31/2025 21 1 done 08/18/2021
EP-D  EP FOR MARKS WELL RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-D  EP FOR MARKS WELL RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,212 1 incomplete08/18/2021
EP-D  EP FOR MARKS WELL SOC notes3 Years01/01/2023 - 12/31/2025 21 2 done 09/09/2024
EP-D  EP FOR MARKS WELL VOLATILE ORGANICS  3 Years01/01/2023 - 12/31/2025 21 1 done 08/02/2023
EP-E  EP FOR RIVERSIDE WELLS ARSENIC  3 Years01/01/2023 - 12/31/2025 21 1 done 08/25/2025
EP-E  EP FOR RIVERSIDE WELLS IOC  3 Years01/01/2023 - 12/31/2025 21 1 done 08/25/2025
EP-E  EP FOR RIVERSIDE WELLS NITRATE  Yearly01/01/2025 - 12/31/2025 21 1 done 09/23/2025
EP-E  EP FOR RIVERSIDE WELLS NITRITE  3 Years01/01/2023 - 12/31/2025 21 1 done 09/23/2025
EP-E  EP FOR RIVERSIDE WELLS RAD - GROSS ALPHA  Quarterly 10/01/2025 - 12/31/2025 21 1 incomplete
EP-E  EP FOR RIVERSIDE WELLS RAD - RADIUM 226/228 Quarterly 10/01/2025 - 12/31/2025 21 1 incomplete
EP-E  EP FOR RIVERSIDE WELLS RAD - URANIUM  Quarterly 10/01/2025 - 12/31/2025 21 1 incomplete08/25/2025
EP-E  EP FOR RIVERSIDE WELLS SOC  Yearly01/01/2025 - 12/31/2025 21 1 done 09/22/2025
EP-E  EP FOR RIVERSIDE WELLS VOLATILE ORGANICS  Yearly01/01/2025 - 12/31/2025 21 1 done 08/25/2025
WTP-A  TP FOR SOUTH FORK MILL CREEKTOTAL ORGANIC CARBONnotesQuarterly10/01/2025 - 12/31/2025 21 1 incomplete 06/03/2025
 Seasonal sampling period:  06/01  thru  09/30

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