OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00556
Who Was Contacted: David Hancock
Contact Phone: 971-241-7203 (Email address hidden)
Contact Date: 05/04/2023
Contacted By: HOFELD, EVAN (DWP)
Contact Method/Location: Phone
Reasons: Lead or Copper
Details: I received an alert on 5/8/23 for 2 lead and copper excursions for the month of April. pH dropped from 7.5 on 4/10 to 7.18 on 4/11 and 6.86 on 4/12 before coming back up to 7.5 on 4/13 resulting in two excursions for the month. The minimum pH is set at 7.4 with a minimum alkalinity of 40 mg/l as CaCO3. The system operator has been working with the SRF technical assistance circuit rider to evaluate improvements to the corrosion control treatment dosing. I had spoken and e-mailed with David Hancock on 5/4/23 regarding a sampling error for alkalinity (April was their first month of compliance monitoring for alkalinity) in which they sampled alkalinity from the source rather than entry point, therefore, they also have a an alkalinity monitoring violation for the month of April. They are also aware of the 14-day sampling interval (as opposed to just every two weeks) and the need to continue daily sampling when they drop below the minimum to demonstrate the problem has been corrected.
Associated Alerts: LCRE32905 - 05/08/2023 -

More information for this water system: SDWIS ID 3976
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