...S&P Global Ratings assigned its '###' rating and stable outlook to the City of Austin, Texas' series 2017 public improvement, series 2017 certificates of obligation, series 2017 public property finance contractual obligations, and series 2017 taxable public improvement bonds. At the same time, S&P Global Ratings affirmed its '###' rating, with a stable outlook, on the city's general obligation (GO) debt and certificates of obligation outstanding. In addition, S&P Global Ratings affirmed its '##+' rating, with a stable outlook, on Mueller Local Government Corp.'s appropriation debt, supported by the city. The certificates of obligation, public improvement bonds, and public property finance contractual obligations are payable from an ad valorem tax, levied within the limits prescribed by law, on all taxable property within Austin. A limited surplus revenue pledge of the city's solid waste disposal system in an amount not to exceed $1,000 further secures the certificates of obligation; however,...