S&P Global Ratings affirmed its 'BBB-' underlying rating for credit program on the Industrial Development Authority of the County of Maricopa, Ariz.'s series 2017A, 2017B, 2017C, and 2017D education revenue bonds, issued for GreatHearts Arizona (GHA; formerly known as Great Hearts Academies). In addition, we affirmed our existing 'BBB-' rating on the Phoenix Industrial Development Authority, Ariz.'s series 2016 and 2014 education facility revenue bonds, also issued for GHA. The outlook is stable. The 'AA-' long-term enhanced program rating on the series 2017A, 2017B, 2017C, and 2017D bonds is based on inclusion in the Arizona Public School Credit Enhancement Program. For more information on the program rating, please see the report "Arizona Public School Credit Enhancement Program; State Revolving Funds/Pools,"