OHA Drinking Water Services
OR41
PWS ID: 00368 ---- HELIX, CITY OF

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 notes3 Years01/01/2028 - 12/31/2028   5 08/10/2025
  Seasonal sampling period:   06/01   thru   09/30
DIST-A  DISTRIBUTION SYSTEM STAGE 2 DBP notes3 Years01/01/2026 - 12/31/2026   1incomplete07/18/2023
  Seasonal sampling period:   07/01   thru   07/31
EP-A  EP FOR WELL #4 ARSENIC notes9 Years 01/01/2023 - 12/31/2031 2,100 1 incomplete10/23/2019
EP-A  EP FOR WELL #4 IOC notes9 Years 01/01/2020 - 12/31/2028 1,005 1 incomplete10/23/2019
EP-A  EP FOR WELL #4 NITRATE  Yearly 01/01/2026 - 12/31/2026 274 1 incomplete08/05/2025
EP-A  EP FOR WELL #4 NITRITE notes9 Years 01/01/2020 - 12/31/2028 1,005 1 incomplete10/23/2019
EP-A  EP FOR WELL #4 PFAS notes6 Months 01/01/2026 - 06/30/2026 90 1 incomplete
  Initial monitoring - 2 samples only
EP-A  EP FOR WELL #4 RAD - GROSS ALPHA  9 Years 01/01/2026 - 12/31/2034 3,196 1 incomplete10/23/2019
EP-A  EP FOR WELL #4 RAD - RADIUM 226/228 9 Years 01/01/2023 - 12/31/2031 2,100 1 incomplete10/23/2019
EP-A  EP FOR WELL #4 RAD - URANIUM  9 Years 01/01/2026 - 12/31/2034 3,196 1 incomplete10/23/2019
EP-A  EP FOR WELL #4 SOC  3 Years 01/01/2026 - 12/31/2028 1,005 1 incomplete08/13/2025
EP-A  EP FOR WELL #4 VOLATILE ORGANICS  3 Years 01/01/2026 - 12/31/2028 1,005 1 incomplete08/05/2025

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Expired Schedules
Facility
ID
Analyte or Group    Sampling
Interval
Start End Samples
Required
   Notes
DIST-A  DISTRIBUTION SYSTEMSTAGE 2 DBP  Yearly01/01/202212/31/20222Collect two dual samples sets in july 2022 for IDSE purposes, one at the location with highest expected HAA5 and one at the location expected to have highest TTHM concentrations.
EP-A  EP FOR WELL #4ARSENIC  3 Years01/01/200212/31/20131
EP-A  EP FOR WELL #4RAD - RADIUM 226/228  6 Years01/01/201712/31/20221
EP-A  EP FOR WELL #4RAD - RADIUM 226/228  9 Years01/01/200812/31/20161

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