Section 303(d)(1)(C) (33 U.S.C. 1313(d)(1)(C)) is amended to read as follows:

"(C) Total maximum daily loads.--

(i) State determination of reasonable progress.--Each State shall establish, to the extent and according to a schedule the State determines is necessary to achieve reasonable progress toward the attainment or maintenance of water quality standards, for the waters identified in paragraph (1)(A) of this subsection, and in accordance with the priority ranking, the total maximum daily load, for those pollutants which the Administrator identifies under section 304(a)(2) as suitable for such calculation.

(ii) Phased total maximum daily loads.--Total maximum daily loads may reflect load reductions the State expects will be realized over time resulting from anticipated implementation of best management practices, storm water controls, or other nonpoint or point source controls; so long as by December 31, 2015, such loads are established at levels necessary to implement the applicable water quality standards with seasonal variations and a margin of safety.

(iii) Considerations.--In establishing each load, the State shall consider the availability of scientifically valid data and information, the projected reductions achievable by control measures or practices for all sources or categories of sources, and the relative cost-effectiveness of implementing such control measures or practices for such sources.''


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