OHA Drinking Water Services

OHA Drinking Water Services
Water Advisory Details

PWS ID: OR41 05581
Advisory Type: Boil Water
Reason: Treatment Failure, Disinfection
Area Affected: System-wide
Affected Populations: All
Begin Date: May 09, 2018
Date Lifted: Nov 15, 2018
Who Was Contacted: Megan Maloney
Contact Phone: 541-252-1312
Details: A power failure at Weiss Estates caused their chlorine pump to stop working. They measured zero residual on May 8. The pump was reset and working again as of that evening. A boil advisory was issued May 9. The boil notice will remain in place until the DRC is confident the chlorine residual is maintaining the normal target range, and distribution samples test absent for coliform bacteria.

Update 08/21/2018:  Although the issue of the chlorine pump and a faulty chlorine meter have been resolved, the advisory remains in place because compliance has not been achieved consistently over time. The chlorine level continues to be close to the minimum (and occasionally below the 0.2 requirement at all times at the Entry Point). They are also seeing a short increase in pH rise at the time of chemical cleaning of the membrane. That pH increase means the CT may not be met that day. The DRC suspects the increase may be due to some caustic soda not being completely flushed out of the system after it is used for the chemical cleaning (CIP). He will look at solutions.

Lifted 11/15/2018:  The system met the criteria for lifting the advisory because they have consistently met CT/the disinfection standard for 6 weeks now, and coliform testing results were always negative. The water system had been conservative in choosing to remain on a boil advisory this long until they felt the issues (that had led to a day or two of non-compliance per month) were fully resolved.

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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
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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: 3923