OHA Drinking Water Services
OR41
PWS ID: 00932 ---- WARRENTON, 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-ATOTAL ORGANIC CARBON Quarterly01/01/2026 - 03/31/2026 33 1 incomplete 04/08/2025
DIST-A  DISTRIBUTION SYSTEM ASBESTOS, DIST  9 Years01/01/2023 - 12/31/2031 2,134 1 done 04/03/2024
DIST-A  DISTRIBUTION SYSTEM LEAD & COPPER notes3 Years01/01/2027 - 12/31/2027   20 09/03/2024
  Seasonal sampling period:   06/01   thru   09/30
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP  Quarterly 01/01/2026 - 03/31/2026 33 2 incomplete10/22/2025
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) ARSENIC notes9 Years01/01/2020 - 12/31/2028 1,039 1 done 02/10/2021
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) IOC notes9 Years01/01/2020 - 12/31/2028 1,039 1 done 02/10/2021
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) NITRATE notesYearly 01/01/2026 - 12/31/2026 308 1 incomplete02/11/2025
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) NITRITE notes9 Years01/01/2020 - 12/31/2028 1,039 1 done 02/10/2021
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) RAD - GROSS ALPHA notes9 Years 01/01/2026 - 12/31/2034 3,230 1 incomplete03/12/2025
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) RAD - RADIUM 226/228notes9 Years 01/01/2026 - 12/31/2034 3,230 1 incomplete03/12/2025
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) RAD - URANIUM notes9 Years 01/01/2026 - 12/31/2034 3,230 1 incomplete03/12/2025
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) SOC notes3 Years 01/01/2026 - 12/31/2028 1,039 2 incomplete10/15/2025
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK) VOLATILE ORGANICS notesYearly 01/01/2026 - 12/31/2026 308 1 incomplete05/20/2025

5  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-ACYANOTOXINS  2 Weeks07/15/201801/24/20191
CH-A  COMMON HEADER FOR WTP-ATOTAL ORGANIC CARBON  Monthly01/01/200409/30/20131Raw Water TOC Only Required for Reduction in DBP Monitoring
CH-A  COMMON HEADER FOR WTP-ATOTAL ORGANIC CARBON  Monthly10/01/201312/31/20141Monthly Raw Water TOC Sampling Required Only if Seeking DBP Reduction to Annual Schedule.
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Quarterly01/01/200412/31/20071After Treatment 2007 Results Indicate R&C Below MCL
DIST-A  DISTRIBUTION SYSTEMHAA5 & TTHM  Yearly01/01/200809/30/20131Sample between June 1 and Sept. 30. Monitoring reduction granted.
DIST-A  DISTRIBUTION SYSTEMLEAD & COPPER  6 Months01/01/200312/31/200340
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Quarterly10/01/201312/31/20142Sample in Nov, Feb, May, and Aug
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Yearly01/01/201512/31/20242Sample in November
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK)ARSENIC  Yearly01/01/200212/31/20081
EP-A  EP FOR WTP (LEWIS & CLARK RIVER/CREEK)PFAS  Quarterly01/01/202312/31/20231

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More information for this water system: SDWIS ID 3918
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