Or. Admin. R. 603-095-2740 – Required Prevention and Control Measures

(1) A landowner shall be responsible for only those conditions caused by activities conducted on land managed by the landowner. Criteria do not apply to conditions resulting from unusual weather events or other exceptional circumstances that could not have been reasonably anticipated.
(2) Pollution Control and Waste Management: Effective on rule adoption. No person subject to these rules shall violate any provision of ORS 468B.025 or 468B.050.
(3) Streamside Conditions. By January 1, 2008, no person may contribute to conditions that preclude establishment and development of adequate riparian vegetation for streambank stability and shading, consistent with site capability.
(4) Irrigation Surface Water Return Flow:
1. (a) After January 1, 2008, irrigation surface water return flow to waters of the state shall not cause an excessive, systematic, or persistent increase in sediment levels already present in the receiving waters, except where the return flows do not cause the receiving waters to exceed established sediment standards.
2. (b) A landowner conducting irrigation activities in accordance with a plan approved in writing by the department or its designee shall be deemed to be in compliance with this rule.

ORS 561.190 - 561.191 & 568.912

ORS 568.900 - 568.933