OHA Drinking Water Services
OR41
PWS ID: 00587 ---- ONTARIO, 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-A1  CH FOR OLD PLANT TOC & ALKALINITY notesQuarterly 04/01/2026 - 06/30/2026 87 1 incomplete01/13/2026
CH-A2  CH FOR WESTECH PLANT CYANOTOXINS  2 Weeks 03/22/2026 - 04/04/2026 0 1 incomplete10/24/2025
CH-A2  CH FOR WESTECH PLANT TOC & ALKALINITY notesQuarterly 04/01/2026 - 06/30/2026 87 1 incomplete01/13/2026
DIST-A  Distribution System ASBESTOS, DIST notes9 Years01/01/2020 - 12/31/2028 1,002 1 done 01/23/2023
DIST-A  Distribution System LEAD & COPPER notes3 Years01/01/2027 - 12/31/2027   30 09/20/2024
  Seasonal sampling period:   06/01   thru   09/30
DIST-A  Distribution System STAGE 2 DBP notesQuarterly 04/01/2026 - 06/30/2026 87 4 incomplete01/05/2026
EP-A  EP FOR RIVER, WELLS ARSENIC notes9 Years 01/01/2020 - 12/31/2028 1,002 1 incomplete07/16/2019
EP-A  EP FOR RIVER, WELLS IOC  9 Years 01/01/2020 - 12/31/2028 1,002 1 incomplete07/16/2019
EP-A  EP FOR RIVER, WELLS NITRATE  Yearly 01/01/2026 - 12/31/2026 271 1 incomplete07/01/2025
EP-A  EP FOR RIVER, WELLS NITRITE  9 Years 01/01/2020 - 12/31/2028 1,002 1 incomplete07/16/2019
EP-A  EP FOR RIVER, WELLS PFAS notesQuarterly 04/01/2026 - 06/30/2026 87 1 incomplete
  Initial monitoring - 4 quarters only
EP-A  EP FOR RIVER, WELLS RAD - GROSS ALPHA  6 Years 01/01/2023 - 12/31/2028 1,002 1 incomplete07/06/2020
EP-A  EP FOR RIVER, WELLS RAD - RADIUM 226/228 9 Years 01/01/2020 - 12/31/2028 1,002 1 incomplete07/11/2018
EP-A  EP FOR RIVER, WELLS RAD - URANIUM  6 Years 01/01/2023 - 12/31/2028 1,002 1 incomplete07/06/2020
EP-A  EP FOR RIVER, WELLS SOC notes3 Years 01/01/2026 - 12/31/2028 1,002 2 incomplete08/13/2025
EP-A  EP FOR RIVER, WELLS VOLATILE ORGANICS  Yearly 01/01/2026 - 12/31/2026 271 1 incomplete07/01/2025
WTP-A1  TP FOR OLD PLANTTOTAL ORGANIC CARBON Quarterly04/01/2026 - 06/30/2026 87 1 incomplete 01/13/2026
WTP-A2  TP FOR WESTECH PLANTTOTAL ORGANIC CARBON Quarterly04/01/2026 - 06/30/2026 87 1 incomplete 01/13/2026

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