OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00218
PWS Name: CORNELIUS, CITY OF
 
Who Was Contacted: Rene Redelsperger
Contact Phone: 503-702-6046
Contact Date: 11/08/2021
Contacted By: ALFAFARA, NICOLE (DWP)
Contact Method/Location: Phone
 
Assistance Type: WATER QUALITY ALERT RESPONSE
Reasons: Disinfection Byproducts
 
Details: System Staff reached out to DWS Staff about recent DBP data. DWS Staff spoke with System Staff about the total trihalomethane (TTHM) sample result of 0.0809 mg/L for a DBP sample taken on 11/3/21 from #2 Reservoir site. System Staff suspected reservoir maintenance and cleaning that included drawing the reservoir down to ~4ft may have played a role in the high level of TTHM detected. DWS Staff informed System Staff DBP compliance is based on locational running annual average (LRAA) over 4 quarters and with the recent November results the TTHM LRAA is 0.053 mg/L for #2 Reservoir site which is below the TTHM LRAA MCL = 0.080 mg/L.
 
Associated Alerts: CHEM9529 - 11/08/2021 - TTHM



More information for this water system: SDWIS ID 4033
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  ::  Corrosion Control (LCR)  ::  DBP Sample Sites  ::  FANLs  ::  MRDL  ::  GWR 4-Log  ::  Turbidity  ::  SWTR  ::  LRAA

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
Water Advisories  ::  Contact Reports  ::  Cyanotoxins  ::  PFAS  ::  Post-wildfire VOCs  ::  Fluoride

Introduction  ::  Data Search Options  ::  Water System Search  ::  DWS Home  ::  DWS Rules

Need help? Email Drinking Water Services for assistance.Staff/Partner Login