OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details
PWS ID: OR41 00937
PWS Name: WELCHES WATER COMPANY
 
Who Was Contacted and Phone: Jeremy Tower (503) 806-4734
Contact Date: 04/28/2017
Contacted By: FARRELLY, PETER (DWP)
Contact Method/Location: Office
 
Assistance Type: WATER QUALITY ALERT RESPONSE
Reasons: Lead or Copper
Coliform
 
Details: SUMMARY: LCR - Using UV as a non-BAT treatment for lead DETAILS: Welches first exceeded the lead action level after they began chlorinating their (TC+) spring. The operating theory is that the chlorine reduces the pH enough to make the water corrosive. This increased the lead.
UV was recommended by Welches as their lead treatment. Its unconventional, but it is accepted as an unpiloted treatment for lead. (It is intended to simply not reduce the pH below its natural levels.) ACTION NEEDED: Sample lead and copper every 6 months in 2017.
Submit plans to install UV treatment.
Submit more pH and alkalinity data in 2017 from both the SOURCE and the DISTRIBUTION after chlorination. (One 2016 sample shows alkalinity unchanged from source to distribution in low 20s ppm
 
Associated Alerts: CHEM7238 - 08/12/2016 - LEAD SUMMARY


More information for this water system: SDWIS ID 3477
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