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 01/01/2026 - 03/31/2026 84 1 incomplete10/13/2025
CH-A2  CH FOR WESTECH PLANT CYANOTOXINS  2 Weeks 12/28/2025 - 01/10/2026 4 1 incomplete10/24/2025
CH-A2  CH FOR WESTECH PLANT TOC & ALKALINITY notesQuarterly 01/01/2026 - 03/31/2026 84 1 incomplete10/13/2025
DIST-A  Distribution System ASBESTOS, DIST notes9 Years01/01/2020 - 12/31/2028 1,090 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 01/01/2026 - 03/31/2026 84 4 incomplete10/13/2025
EP-A  EP FOR RIVER, WELLS ARSENIC notes9 Years 01/01/2020 - 12/31/2028 1,090 1 incomplete07/16/2019
EP-A  EP FOR RIVER, WELLS IOC  9 Years 01/01/2020 - 12/31/2028 1,090 1 incomplete07/16/2019
EP-A  EP FOR RIVER, WELLS NITRATE  Yearly 01/01/2026 - 12/31/2026 359 1 incomplete07/01/2025
EP-A  EP FOR RIVER, WELLS NITRITE  9 Years 01/01/2020 - 12/31/2028 1,090 1 incomplete07/16/2019
EP-A  EP FOR RIVER, WELLS RAD - GROSS ALPHA  6 Years 01/01/2023 - 12/31/2028 1,090 1 incomplete07/06/2020
EP-A  EP FOR RIVER, WELLS RAD - RADIUM 226/228 9 Years 01/01/2020 - 12/31/2028 1,090 1 incomplete07/11/2018
EP-A  EP FOR RIVER, WELLS RAD - URANIUM  6 Years 01/01/2023 - 12/31/2028 1,090 1 incomplete07/06/2020
EP-A  EP FOR RIVER, WELLS SOC notes3 Years 01/01/2026 - 12/31/2028 1,090 2 incomplete08/13/2025
EP-A  EP FOR RIVER, WELLS VOLATILE ORGANICS  Yearly 01/01/2026 - 12/31/2026 359 1 incomplete07/01/2025
WTP-A1  TP FOR OLD PLANTTOTAL ORGANIC CARBON Quarterly01/01/2026 - 03/31/2026 84 1 incomplete 10/13/2025
WTP-A2  TP FOR WESTECH PLANTTOTAL ORGANIC CARBON Quarterly01/01/2026 - 03/31/2026 84 1 incomplete 10/13/2025

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Expired Schedules
Facility
ID		 Analyte or Group    Sampling
Interval		 Start End Samples
Required		    Notes
CH-A1  CH FOR OLD PLANTCYANOTOXINS  2 Weeks07/15/201801/24/20191
CH-A1  CH FOR OLD PLANTTOC & ALKALINITY  Monthly01/01/200206/30/20141Raw and filtered TOC and alkalinity
CH-A2  CH FOR WESTECH PLANTCYANOTOXINS  2 Weeks09/08/202509/14/20251
CH-A2  CH FOR WESTECH PLANTCYANOTOXINS  WK 09/15/202509/28/20251
DIST-A  Distribution SystemHAA5 & TTHM  Quarterly01/01/200212/31/20024Reflects 4 RT Samples Per QT Per WTP
DIST-A  Distribution SystemHAA5 & TTHM  Quarterly01/01/200309/30/20134Reflects 4 RT Samples Per QT Per WTP
DIST-A  Distribution SystemLEAD & COPPER  3 Years01/01/200212/31/201630Sample Between June 1st and Sept 30th
DIST-A  Distribution SystemLEAD & COPPER  6 Months07/01/201706/30/201860
EP-A  EP FOR RIVER, WELLSARSENIC  Yearly01/01/200212/31/20191
EP-A  EP FOR RIVER, WELLSCYANOTOXINS  WK 09/15/202509/28/20251
EP-A  EP FOR RIVER, WELLSIOC  9 Years01/01/200212/31/20171Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR RIVER, WELLSIOC  Yearly01/01/201812/31/20191
EP-A  EP FOR RIVER, WELLSNITRITE  9 Years01/01/200212/31/20171Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR RIVER, WELLSNITRITE  Yearly01/01/201812/31/20191
EP-A  EP FOR RIVER, WELLSRAD - GROSS ALPHA  9 Years01/01/200812/31/20161
EP-A  EP FOR RIVER, WELLSRAD - GROSS ALPHA  9 Years01/01/201712/31/20171Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR RIVER, WELLSRAD - GROSS ALPHA  Quarterly07/01/201809/30/20201Sample yearly in 3rd Quarter
EP-A  EP FOR RIVER, WELLSRAD - RADIUM 226/228  9 Years01/01/200812/31/20161
EP-A  EP FOR RIVER, WELLSRAD - RADIUM 226/228  9 Years01/01/201712/31/20171Schedule Reflects Monitoring Reduction Granted
EP-A  EP FOR RIVER, WELLSRAD - RADIUM 226/228  Quarterly07/01/201809/30/20181Sample yearly in 3rd Quarter
EP-A  EP FOR RIVER, WELLSRAD - URANIUM  6 Years01/01/200812/31/20171
EP-A  EP FOR RIVER, WELLSRAD - URANIUM  Quarterly07/01/201809/30/20201Sample yearly in 3rd Quarter
EP-A  EP FOR RIVER, WELLSSOC  3 Years01/01/200212/31/201622 Consec. QT Samples
EP-A  EP FOR RIVER, WELLSSOC  Yearly01/01/201812/31/20191
WTP-A1  TP FOR OLD PLANTTOTAL ORGANIC CARBON  Monthly01/01/200206/30/20141Post Filtration TOC

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