Oregon Administrative Rules
Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY
Division 41 - WATER QUALITY STANDARDS: BENEFICIAL USES, POLICIES, AND CRITERIA FOR OREGON
Section 340-041-0315 - Basin-Specific Criteria (Umatilla): Water Quality Standards and Policies for this Basin
Current through Register Vol. 63, No. 3, March 1, 2024
(1) pH (hydrogen ion concentration). pH values may not fall outside the following range: all Basin streams except the main stem Columbia River and the "constructed channel' segment of the West Division Main Canal: 6.5-9.0. When more than 25 percent of ambient measurements taken between June and September are greater than pH 8.7, and as resources are available according to priorities set by DEQ, DEQ will determine whether the values higher than 8.7 are anthropogenic or natural in origin.
(2) The following criteria apply to the "constructed channel' segment of the West Division Main Canal and supersede the water quality standards in OAR 340-041-0011 through 340-041-0036 for the "constructed channel' segment of the canal. The criteria in (b) and (c) also apply to the "overflow channels' segment of the West Division Main Canal.
(3) Minimum Design Criteria for Treatment and control of Sewage Wastes in this Basin:
To view tables referenced in rule text, click here to view rule.
Statutory/Other Authority: ORS 468.020, 468B.030, 468B.035 & 468B.048
Statutes/Other Implemented: ORS 468B.030, 468B.035 & 468B.048