S&P Global Ratings affirmed its 'AA-' rating on Trinity River Authority (TRA)- Red Oak Creek Project, Texas' outstanding revenue improvement bonds, issued for the Red Oak Creek system, a regional wastewater treatment system. The outlook is stable. TRA is a governmental agency of the state of Texas tasked with, among other functions, water flows, water quality, recreation, and watershed management along a more-than-700-mile basin that extends from about the Oklahoma border to the Gulf of Mexico northeast of Houston. TRA's Red Oak Creek Regional Wastewater System includes a wastewater treatment plant and related pumping infrastructure on behalf of six cities within the Dallas-Fort Worth-Arlington metropolitan statistical area (MSA). Payments are based on the participants' sewer flows as a percentage of