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 01/01/2026 - 03/31/2026 26 1 incomplete06/03/2025
DIST-A  Distribution System ASBESTOS, DIST notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 08/08/2022
DIST-A  Distribution System HAA5 & TTHM notesQuarterly 01/01/2026 - 03/31/2026 26 2 incomplete
DIST-A  Distribution System LEAD & COPPER  6 Months 01/01/2026 - 06/30/2026 117 60 incomplete07/12/2024
EP-A  EP FOR SOUTH FORK MILL CREEK ARSENIC notes9 Years 01/01/2026 - 12/31/2034 3,223 1 incomplete08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK IOC notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK NITRATE  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK NITRITE notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 08/25/2025
EP-A  EP FOR SOUTH FORK MILL CREEK PFAS notesQuarterly 01/01/2026 - 03/31/2026 26 1 incomplete
  Initial monitoring - 4 quarters only
EP-A  EP FOR SOUTH FORK MILL CREEK RAD - GROSS ALPHA  9 Years 01/01/2026 - 12/31/2034 3,223 1 incomplete08/18/2021
EP-A  EP FOR SOUTH FORK MILL CREEK RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-A  EP FOR SOUTH FORK MILL CREEK RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-A  EP FOR SOUTH FORK MILL CREEK SOC notes3 Years 01/01/2026 - 12/31/2028 1,032 2 incomplete09/09/2024
EP-A  EP FOR SOUTH FORK MILL CREEK VOLATILE ORGANICS  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete08/25/2025
EP-B  EP FOR LONE PINE WELL ARSENIC notes9 Years 01/01/2026 - 12/31/2034 3,223 1 incomplete08/25/2025
EP-B  EP FOR LONE PINE WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 08/25/2025
EP-B  EP FOR LONE PINE WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete09/23/2025
EP-B  EP FOR LONE PINE WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 09/23/2025
EP-B  EP FOR LONE PINE WELL PFAS notesQuarterly 01/01/2026 - 03/31/2026 26 1 incomplete
  Initial monitoring - 4 quarters only
EP-B  EP FOR LONE PINE WELL RAD - GROSS ALPHA  9 Years 01/01/2026 - 12/31/2034 3,223 1 incomplete08/18/2021
EP-B  EP FOR LONE PINE WELL RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-B  EP FOR LONE PINE WELL RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-B  EP FOR LONE PINE WELL SOC  3 Years 01/01/2026 - 12/31/2028 1,032 2 incomplete09/09/2024
EP-B  EP FOR LONE PINE WELL VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete08/02/2023
EP-C  EP FOR JORDAN ST WELL ARSENIC notes9 Years 01/01/2026 - 12/31/2034 3,223 1 incomplete08/25/2025
EP-C  EP FOR JORDAN ST WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 08/25/2025
EP-C  EP FOR JORDAN ST WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete09/23/2025
EP-C  EP FOR JORDAN ST WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 09/23/2025
EP-C  EP FOR JORDAN ST WELL PFAS notesQuarterly 01/01/2026 - 03/31/2026 26 1 incomplete
  Initial monitoring - 4 quarters only
EP-C  EP FOR JORDAN ST WELL RAD - GROSS ALPHA  9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-C  EP FOR JORDAN ST WELL RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-C  EP FOR JORDAN ST WELL RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-C  EP FOR JORDAN ST WELL SOC notes3 Years 01/01/2026 - 12/31/2028 1,032 2 incomplete09/09/2024
EP-C  EP FOR JORDAN ST WELL VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete08/02/2023
EP-D  EP FOR MARKS WELL ARSENIC notes9 Years 01/01/2026 - 12/31/2034 3,223 1 incomplete09/23/2025
EP-D  EP FOR MARKS WELL IOC notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 09/23/2025
EP-D  EP FOR MARKS WELL NITRATE  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete09/23/2025
EP-D  EP FOR MARKS WELL NITRITE notes9 Years01/01/2020 - 12/31/2028 1,032 1 done 09/23/2025
EP-D  EP FOR MARKS WELL PFAS notesQuarterly 01/01/2026 - 03/31/2026 26 1 incomplete
  Initial monitoring - 4 quarters only
EP-D  EP FOR MARKS WELL RAD - GROSS ALPHA  9 Years 01/01/2026 - 12/31/2034 3,223 1 incomplete08/18/2021
EP-D  EP FOR MARKS WELL RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-D  EP FOR MARKS WELL RAD - URANIUM  9 Years 01/01/2023 - 12/31/2031 2,127 1 incomplete08/18/2021
EP-D  EP FOR MARKS WELL SOC notes3 Years 01/01/2026 - 12/31/2028 1,032 2 incomplete09/09/2024
EP-D  EP FOR MARKS WELL VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete08/02/2023
EP-E  EP FOR RIVERSIDE WELLS ARSENIC  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete08/25/2025
EP-E  EP FOR RIVERSIDE WELLS IOC  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete08/25/2025
EP-E  EP FOR RIVERSIDE WELLS NITRATE  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete09/23/2025
EP-E  EP FOR RIVERSIDE WELLS NITRITE  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete09/23/2025
EP-E  EP FOR RIVERSIDE WELLS PFAS notesQuarterly 01/01/2026 - 03/31/2026 26 1 incomplete
  Initial monitoring - 4 quarters only
EP-E  EP FOR RIVERSIDE WELLS RAD - GROSS ALPHA  Quarterly 01/01/2026 - 03/31/2026 26 1 incomplete
EP-E  EP FOR RIVERSIDE WELLS RAD - RADIUM 226/228 Quarterly 01/01/2026 - 03/31/2026 26 1 incomplete
EP-E  EP FOR RIVERSIDE WELLS RAD - URANIUM  Quarterly 01/01/2026 - 03/31/2026 26 1 incomplete08/25/2025
EP-E  EP FOR RIVERSIDE WELLS SOC  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete09/22/2025
EP-E  EP FOR RIVERSIDE WELLS VOLATILE ORGANICS  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete08/25/2025
WTP-A  TP FOR SOUTH FORK MILL CREEKTOTAL ORGANIC CARBONnotesQuarterly01/01/2026 - 03/31/2026 26 1 incomplete 06/03/2025
 Seasonal sampling period:  06/01  thru  09/30

6  secs
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Expired Schedules
Facility
ID		 Analyte or Group    Sampling
Interval		 Start End Samples
Required		    Notes
CH-A  COMMON HEADER FOR WTP-ATOC & ALKALINITY  Monthly01/01/200203/31/20251Raw and filtered TOC and alkalinity
DIST-A  Distribution SystemHAA5 & TTHM  Quarterly01/01/200209/30/20134Schedule Reflects Minimal Use of Wells.
DIST-A  Distribution SystemLEAD & COPPER  3 Years01/01/200206/30/202530Sample Between June 1st and Sept 30th
DIST-A  Distribution SystemSTAGE 2 DBP  Quarterly10/01/201303/31/20254Sample in Dec, Mar, June, and Sept
EP-A  EP FOR SOUTH FORK MILL CREEKARSENIC  Yearly01/01/200212/31/20161
EP-A  EP FOR SOUTH FORK MILL CREEKRAD - RADIUM 226/228  6 Years01/01/200812/31/20131
EP-A  EP FOR SOUTH FORK MILL CREEKRAD - URANIUM  6 Years01/01/200812/31/20131
EP-A  EP FOR SOUTH FORK MILL CREEKVOLATILE ORGANICS  Yearly01/01/200212/31/20101
EP-A  EP FOR SOUTH FORK MILL CREEKXYLENES, TOTAL   Quarterly10/01/200906/30/20101
EP-B  EP FOR LONE PINE WELLARSENIC  3 Years01/01/200212/31/20161
EP-B  EP FOR LONE PINE WELLNITRATE  Yearly01/01/200211/13/20171
EP-B  EP FOR LONE PINE WELLRAD - RADIUM 226/228  6 Years01/01/200812/31/20131
EP-B  EP FOR LONE PINE WELLRAD - URANIUM  6 Years01/01/200812/31/20131
EP-B  EP FOR LONE PINE WELLSOC  3 Years01/01/200211/13/201722 Consec. QT Samples
EP-B  EP FOR LONE PINE WELLVOLATILE ORGANICS  3 Years01/01/200211/13/20171
EP-C  EP FOR JORDAN ST WELLARSENIC  3 Years01/01/200212/31/20161
EP-C  EP FOR JORDAN ST WELLRAD - GROSS ALPHA  6 Years01/01/200812/31/20131
EP-C  EP FOR JORDAN ST WELLRAD - RADIUM 226/228  6 Years01/01/200812/31/20131
EP-C  EP FOR JORDAN ST WELLRAD - URANIUM  6 Years01/01/200812/31/20131
EP-D  EP FOR MARKS WELLARSENIC  3 Years01/01/200212/31/20161
EP-D  EP FOR MARKS WELLRAD - RADIUM 226/228  6 Years01/01/200812/31/20131
EP-D  EP FOR MARKS WELLRAD - URANIUM  6 Years01/01/200812/31/20131
WTP-A  TP FOR SOUTH FORK MILL CREEKTOTAL ORGANIC CARBON  Monthly01/01/200203/31/20251Post Filtration TOC

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