OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 95494
Who Was Contacted: Jeff Roth
Contact Phone: 503-932-4513 (Email address hidden)
Contact Date: 08/03/2020
Contacted By: NUSRALA, JAMES (DWP)
Contact Method/Location: Phone
Reasons: Arsenic
Details: May 20th sample from Mars' newly constructed well, that has received final approval in July, detected arsenic at 11.3 micrograms per liter (ug/L), slightly over the MCL of 10.0 ug/L. Jeff and I discussed that a single exceedance of the arsenic MCL is not a violation, with compliance determined by a 4-quarter running annual average. Water system to begin quarterly monitoring at the entry point for arsenic in 3rd quarter 2020, as system will start using new well this week. Dept of Ag and DWS to review follow up samples. Public notice and treatment would be required if the running annual average exceeds the MCL.
Associated Alerts: CHEM9014 - 07/28/2020 - ARSENIC

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