S. 3590: Water Infrastructure Resilience and Sustainability Act of 2026

S. 3590, the Water Infrastructure Resilience and Sustainability Act of 2026, is a targeted reauthorization bill introduced on January 7, 2026, in the 119th Congress, 2d Session. Its core function is narrow but important: it updates existing federal law so several water infrastructure resilience and sustainability programs do not stop after fiscal year 2026. Instead, the bill changes those authorization windows to cover fiscal years 2027 through 2031.

On the clean water side, Section 101 amends Section 223(g)(1) of the Federal Water Pollution Control Act, codified at 33 U.S.C. 1302a(g)(1). The change is simple and precise: it replaces the current authorization period of “fiscal years 2022 through 2026” with “fiscal years 2027 through 2031.” That means entities already eligible for clean water infrastructure resiliency and sustainability funding would continue to have access to that federal program for five additional fiscal years.

On the drinking water side, the bill makes parallel changes in two places under the Safe Drinking Water Act. Section 201 amends Section 1459A(l), codified at 42 U.S.C. 300j-19a(l), by replacing “fiscal years 2022 through 2026” with “fiscal years 2027 through 2031” in both paragraph (2) and paragraph (6). Section 202 amends Section 1459F(f)(1), codified at 42 U.S.C. 300j-19g(f)(1), making the same fiscal-year swap for the midsize and large drinking water system infrastructure resilience and sustainability program.

What the bill does not do is just as important as what it does. According to the bill text extracted here, S. 3590 contains no new definitions, no penalties, no fines, no enforcement tools, and no reporting requirements. It does not set new dollar amounts in this text. Instead, it preserves continuity for existing programs under the Federal Water Pollution Control Act and the Safe Drinking Water Act, giving water-sector participants more certainty through the end of fiscal year 2031.