S&P Global Ratings Services assigned its 'AA+' long-term rating to King County, Wash.'s $151.58 million series 2017 sewer revenue refunding bonds, issued for the county's wastewater treatment division (WTD). The outlook is stable. The series 2017 bonds are being issued to refund certain outstanding parity bonds and parity lien obligations for debt service savings. The series 2017 bonds will be secured by a senior (first) lien on WTD's net revenues. The bonds will be additionally secured by the WTD's parity lien reserve fund, which is required to be funded at maximum annual debt service (MADS). A rate covenant requires the WTD to generate debt service coverage on parity bonds (first lien bonds) of at least 1.15x. The county can issue