Yes, the items you mention could 'break' the grd continuity of the water piping. And, yes, the GEC is my preferred choice, if I am doing the install.
However, FYI, the two 'offenders' in alarm inspections are:
NO earth ground.
NO bushing/grommet at cable entry into enclosure.
You may be shocked at some of the creativity I have seen.
#14 wrapped around a water pipe, similar to a 'choke'. Yes, it was green insul; no it was not terminated, just twirled around about 15-20 turns.
#14 under the 6/32 plate screw; a real work of art
#14 grn thru closet ceiling, not showing anywhere; pulled about 6" from above ceiling.
Small jumper from designated terminal to a sheetrock screw, that also secured the panel to the wall.
#14 grn shoved into the u-ground on the 'alarm receptacle'
and on and on.
Then there's the cable specialist, #10 grd from his splitter to a 2" pipe clamp....on PVC. Or, the lug tek screwed into the meter pan, or the downspout.