OHA Drinking Water Services
OR41
PWS ID: 95757 ---- COLUMBIA BASIN ONION

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 117 5 incomplete11/26/2025
EP-A  EP FOR WELL ARSENIC  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete11/11/2025
EP-A  EP FOR WELL IOC  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete11/11/2025
EP-A  EP FOR WELL NITRATE  Quarterly 01/01/2026 - 03/31/2026 26 1 incomplete11/11/2025
EP-A  EP FOR WELL NITRITE  3 Years 01/01/2026 - 12/31/2028 1,032 1 incomplete11/11/2025
EP-A  EP FOR WELL PFAS notes6 Months 01/01/2026 - 06/30/2026 117 1 incomplete
  Initial monitoring - 2 samples only
EP-A  EP FOR WELL SOC  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete11/13/2025
EP-A  EP FOR WELL VOLATILE ORGANICS  Yearly 01/01/2026 - 12/31/2026 301 1 incomplete11/11/2025

7  secs
Show Expired


More information for this water system: SDWIS ID 5721
System Info  ::  Report for Lenders  ::  Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Contacts & Advisories  ::  Site Visits  ::  Public Notice
Coliform Summary  ::  Coliform Results  ::  Coliform Schedules  ::  LT2  ::  GW/GWUDI Source Details  ::  Plan Review  ::  Annual Fee
Chemical Summary  ::  Chemical Results  ::  Chemical Schedules  ::  Chemical Schedule Summary  ::  Arsenic RAA  ::  Cyanotoxins  ::  PFAS
Lead & Copper  ::  DBP Sample Sites  ::  FANLs  ::  MRDL  ::  GWR 4-Log  ::  Turbidity  ::  SWTR  ::  LRAA  ::  DW Source Protection
Information for all water systems:
Water System Inventory  ::  Water System Surveys  ::  Outstanding Performers  ::  Treatment Plant Inspections  ::  Treatment  ::  Plan Reviews
Alerts  ::  Violations  ::  Compliance & Enforcement  ::  Deficiencies  ::  System Scores  ::  Exceedances  ::  Public Notices  ::  Service Lines
Water Advisories  ::  Contact Reports  ::  Cyanotoxins  ::  PFAS  ::  Post-wildfire VOCs  ::  Fluoride  ::  Certification List  ::  DW Source Protection
Main menu:
Introduction  ::  Data Search Options  ::  Water System Search  ::  DWS Home  ::  DWS Rules
Need help? Email Drinking Water Services for assistance.Staff/Partner Login