OHA Drinking Water Services
Contact Report Details |
|||
| PWS ID: | OR41 00379 | ||
| PWS Name: | JOINT WATER COMMISSION | ||
| Who Was Contacted: | Todd Evers and Chris Wilson | ||
| Contact Phone: | 541-497-3945 (Email address hidden) | ||
| Contact Date: | 01/13/2026 | ||
| Contacted By: | ALFAFARA, NICOLE (DWP) | ||
| Contact Method/Location: | Phone | ||
| Assistance Type: | INCIDENT RESPONSE | ||
| Reasons: | SWTR |
||
| Details: | On January 12, the system experienced an operational event during SCADA upgrade work. Filter 16 experienced filter media disturbance following 3 air scours and the filter effluent valve was left open, allowing water intended to be filtered-to-waste to enter the distribution system. This led to an increase in turbidity; filter effluent from Filter 16 had a turbidity of 99 NTU for 1 minute and 46 seconds and combined effluent from Filters 15 and 16 had a maximum turbidity of 29 NTU with approximately 27,000 gallons of water exceeding 1 NTU entering the distribution system. Disinfection was maintained during the entire event. System staff attempted to reach DWS after hours on January 12. System staff consulted with DWS staff January 13, at which time finished water turbidity data were provided and follow-up questions were sent via email. On January 14, system staff provided additional detailed turbidity metrics via email and consulted with DWS regarding those details. Hydraulic modeling conducted by the system indicates water produced during the event would have reached customers taps between midnight and 3:00 am on January 13th. Given the length of time that had passed, DWS did not consider a Tier 1 Boil Public Notice; however the system voluntarily notified purchasing systems and industrial users. While elevated turbidity was observed during the event and will be reported on their monthly report, all required 4-hour combined filter effluent turbidity compliance readings on January 12 remained below 0.3 NTU (ranging from 0.02-0.03 NTU). The elevated turbidity observed did not persist for a duration that would constitute a treatment technique violation under the SWTR, LT1, or LT2; therefore, a Tier 2 Public Notice was not required. Follow-up sampling was conducted to assess water quality post this operational event and that is detailed in a separate contact report found here: https://yourwater.oregon.gov/cr-detail.php?crisn=24315 |
||