I checked with my local municipal water dept & they use the same water/reservoirs as NYC! so ours is pretty good. they use chlorine, no chloramines in the foreseable future. they do use sodium hydroxide for buffer to keep pH between 8.4-9.2, federally mandated for all municipal water suppliers.
I tested my tap last week cuz my pH zoomed from 6.6 to 7.6, cuz they had use extra buffers in the system tap pH was 8.8!
but I still wonder why my pH stayed at 6.6 all summer if tap is hi pH?
but last point to address OP comment - we have no trace of ammonia, dept told me it should be zero for us.
I tested my tap last week cuz my pH zoomed from 6.6 to 7.6, cuz they had use extra buffers in the system tap pH was 8.8!
but I still wonder why my pH stayed at 6.6 all summer if tap is hi pH?
but last point to address OP comment - we have no trace of ammonia, dept told me it should be zero for us.