S&P Global Ratings has assigned its 'AA-' rating to Allegheny County Sanitary Authority (ALCOSAN), Pa.'s $434.4 million series 2025 sewer revenue bonds. At the same time, S&P Global Ratings affirmed its 'AA-' long-term rating on ALCOSAN's sewer revenue bonds outstanding. The outlook is stable. NEW YORK (S&P Global Ratings) Sep. 5, 2025--S&P Global Ratings today took the rating actions listed above. We view the utility's physical risk factors as elevated because of the consent decree due to sanitary sewer overflows (SSOs). Further complicating the decree is that it requires the authority to come to agreements with municipalities to regionalize sewer trunk lines. ALCOSAN has been dealing with combined sewer overflow (CSO) and SSO issues since 1997 and is under a
