Exhibits arylsulfatase activity towards the artificial substrate 4-methylumbelliferyl sulfate. an aryl sulfate + H2O = a phenol + H(+) + sulfate Binds 1 Ca(2+) ion per subunit. Not inhibited by DHEAS or warfarin. Optimum pH is 8. The conversion to 3-oxoalanine (also known as C-formylglycine, FGly), of a serine or cysteine residue in prokaryotes and of a cysteine residue in eukaryotes, is critical for catalytic activity. Belongs to the sulfatase family.