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 - TOTAL TRIHALOMETHANES (TTHM)



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System Info :: Report for Lenders :: Alerts :: Violations :: Compliance & Enforcement :: Contacts & Advisories :: Site Visits :: Public Notice
Coliform Summary :: Coliform Results :: Sampling Schedule for Coliform :: Groundwater/GWUDI Source Details :: Plan Review :: Annual Fee
Chemical Group Summary :: Latest Chemical Results :: Entry Point Detects :: Single Analyte Results 
Chemical Schedule Summary :: Chemical Schedule Details
Lead & Copper :: Corrosion Control (LCR) :: Nitrate :: Arsenic :: Radionuclides :: GWR 4-Log :: LT2 :: Cyanotoxins
DBPs :: TOC & Alkalinity :: DBP Sample Sites :: FANLs :: MRDL :: Turbidity :: SWTR :: RAA :: LRAA For SDWIS: 4033