Okla. Stat. tit. 27A § 3-3-412
Except as otherwise provided by state or federal law, a conservation district's responsibility for the operation and maintenance of any structure for the purpose of flood control pursuant to any contractual, statutory, regulatory or other legal authority or obligation, shall not be deemed to include maintaining, protecting or improving the quality of any soil, air, groundwater or surface water or biota affected by, near or comprising any part of the structure, including any water, soil or sediment pooled, impounded or diverted by the structure, including but not limited to, monitoring, limiting, or abating or otherwise controlling or eliminating any point source or nonpoint source pollution or any other biological, chemical, radiological or physical contamination by any source or mechanism.
Okla. Stat. tit. 27A, § 3-3-412