Narrows what EPA can consider when setting baseline, technology-based water pollution limits. It says EPA should weigh costs and benefits using only technologies that are commercially available in the United States, rather than any technology used elsewhere or still in pilot stages.

This change applies to the “best practicable” limits for existing sources under the Clean Water Act. It does not add funding, new programs, or deadlines, and it does not change stricter standards that may still apply or water‑quality based limits needed to meet state water quality standards.