OHA Drinking Water Services
OR41
PWS ID: 06118 ---- COLUMBIA HILLS HOA

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  6 Months 01/01/2026 - 06/30/2026 153 5 incomplete09/15/2025
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP notesYearly 01/01/2026 - 12/31/2026 337 1 incomplete09/16/2025
 Seasonal sampling period:  09/01  thru  09/30
EP-A  EP FOR WELLS ARSENIC  3 Years 01/01/2026 - 12/31/2028 1,068 1 incomplete07/21/2025
EP-A  EP FOR WELLS IOC  3 Years 01/01/2026 - 12/31/2028 1,068 1 incomplete07/21/2025
EP-A  EP FOR WELLS NITRATE  Yearly 01/01/2026 - 12/31/2026 337 1 incomplete07/21/2025
EP-A  EP FOR WELLS NITRITE  3 Years 01/01/2026 - 12/31/2028 1,068 1 incomplete07/21/2025
EP-A  EP FOR WELLS RAD - GROSS ALPHA  9 Years 01/01/2026 - 12/31/2034 3,259 1 incomplete07/28/2024
EP-A  EP FOR WELLS RAD - RADIUM 226/228 9 Years 01/01/2026 - 12/31/2034 3,259 1 incomplete07/28/2024
EP-A  EP FOR WELLS RAD - URANIUM  9 Years 01/01/2026 - 12/31/2034 3,259 1 incomplete07/28/2024
EP-A  EP FOR WELLS SOC  3 Years 01/01/2026 - 12/31/2028 1,068 1 incomplete07/21/2025
EP-A  EP FOR WELLS VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,068 1 incomplete07/21/2025

6  secs
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Expired Schedules
Facility
ID		 Analyte or Group    Sampling
Interval		 Start End Samples
Required		    Notes
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Yearly01/01/201312/31/20131Sample between June 1 and Sept 30th
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  3 Years01/01/201812/31/20225Sample between June 1st and September 30th
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months01/01/200906/30/20095
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months07/01/200912/31/20145
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  Yearly01/01/201512/31/20175Sample between June 1st and September 30th
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 IDSE  Yearly01/01/201312/31/20132Sample During Peak Historical Month for High DBPs.
EP-A  EP FOR WELLSARSENIC  3 Years01/01/200812/31/20131
EP-A  EP FOR WELLSARSENIC  9 Years01/01/201412/31/20221Schedule reflects monitoring reduction granted.
EP-A  EP FOR WELLSIOC  3 Years01/01/200812/31/20131
EP-A  EP FOR WELLSIOC  9 Years01/01/201412/31/20221Schedule reflects monitoring reduction granted.
EP-A  EP FOR WELLSNITRITE  3 Years01/01/200812/31/20131
EP-A  EP FOR WELLSNITRITE  9 Years01/01/201412/31/20221Schedule reflects monitoring reduction granted
EP-A  EP FOR WELLSRAD - GROSS ALPHA  9 Years01/01/201412/31/20221
EP-A  EP FOR WELLSRAD - GROSS ALPHA  Quarterly04/01/200909/30/20121
EP-A  EP FOR WELLSRAD - GROSS ALPHA  Quarterly07/01/202309/30/20241
EP-A  EP FOR WELLSRAD - RADIUM 226/228  9 Years01/01/201412/31/20221
EP-A  EP FOR WELLSRAD - RADIUM 226/228  Quarterly04/01/200909/30/20121
EP-A  EP FOR WELLSRAD - RADIUM 226/228  Quarterly07/01/202309/30/20241
EP-A  EP FOR WELLSRAD - URANIUM  9 Years01/01/201412/31/20221
EP-A  EP FOR WELLSRAD - URANIUM  Quarterly04/01/200909/30/20121
EP-A  EP FOR WELLSRAD - URANIUM  Quarterly07/01/202309/30/20241
EP-B  EP FOR WELL #2 (COLU3174)ARSENIC  3 Years01/01/200805/01/20091
EP-B  EP FOR WELL #2 (COLU3174)IOC  3 Years01/01/200805/01/20091
EP-B  EP FOR WELL #2 (COLU3174)NITRATE  Yearly01/01/200305/01/20091
EP-B  EP FOR WELL #2 (COLU3174)NITRITE  3 Years01/01/200805/01/20091
EP-B  EP FOR WELL #2 (COLU3174)RAD - GROSS ALPHA  Quarterly04/01/200905/01/20091
EP-B  EP FOR WELL #2 (COLU3174)RAD - RADIUM 226/228  Quarterly04/01/200905/01/20091
EP-B  EP FOR WELL #2 (COLU3174)RAD - URANIUM  Quarterly04/01/200905/01/20091
EP-B  EP FOR WELL #2 (COLU3174)SOC  3 Years01/01/200805/01/20091
EP-B  EP FOR WELL #2 (COLU3174)VOLATILE ORGANICS  3 Years01/01/200805/01/20091
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211ARSENIC  3 Years01/01/200804/30/20121
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211IOC  3 Years01/01/200804/30/20121
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211NITRATE  Yearly01/01/200304/30/20121
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211NITRITE  3 Years01/01/200804/30/20121
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211RAD - GROSS ALPHA  Quarterly04/01/200912/31/20111
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211RAD - RADIUM 226/228  Quarterly04/01/200912/31/20111
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211RAD - URANIUM  Quarterly04/01/200912/31/20111
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211SOC  3 Years01/01/200804/30/20121
EP-C  EP FOR WELL #8 (7) - NOW W/ PWS ID#06211VOLATILE ORGANICS  3 Years01/01/200804/30/20121

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