OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00744
Who Was Contacted: Pat Taylor
Contact Phone: 503-856-3560 (Email address hidden)
Contact Date: 05/11/2020
Contacted By: BAIRD, GREGG (DWP)
Contact Method/Location: Phone
Assistance Type: OTHER WATER QUALITY - UCMR4 Manganese detections
Reasons: Other
Details: UCMR4 results for four of the city’s wells sampled on 8/16/2018 and 1/16/19 exceeded the EPA health advisory level for manganese of 0.3 mg/l. Health advisories are non-regulatory, non-enforceable health-based standards. The four wells are Chemawa, Willamette Manor, City Hall, and McNary. The range of results for these wells was 0.31 to 0.40 mg/L (August 2018 samples) and 0.33 to 0.46 mg/L (January 2019 samples). The UCMR4 samples were collected from raw water sample taps prior to any treatment. Two of the wells, Willamette Manor and City Hall, have sequestration treatment for manganese reduction. There are no sample taps post-manganese treatment and prior to the distribution system at either of these wells. Both wells are regularly used year-round. The City Hall well is currently off-line for repairs. Two of the wells, Chemawa and McNary, do not have manganese treatment. Chemawa is an emergency well used during the hottest part of the summer. McNary is typically used June to September each year. Acceptance of the results by EPA led to a delay in the results showing up in the reporting system. OHA-DWS first observed the January 2019 results showing up on 4/27/20 and the August 2018 results on 5/11/20. Based on this information, OHA-DWS sent a letter on 5/11/20 to the city outlining recommendations for the protection of public health including not putting water into the distribution system that is over the health advisory level at anytime which includes not using wells over the advisory level until treatment can be installed, installing post-manganese treatment sample taps and testing to ensure effectiveness of treatment, monitoring at locations in the distribution system near the wells until sample taps can be installed, and develop an ongoing, routine manganese monitoring program going forward in order to verify the effectiveness of the manganese treatment and to ensure manganese levels are below the health advisory level.

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