If you haven’t started yet you could put 20’ or more of #4 (or larger) rebar in the footer. Use a concrete listed clamp to attach a 250.66 sized conductor as your GEC. (typically a #4 solid). Attach this with a lug to building steel and a listed clamp to the piping system to complete the system
**(3) Concrete-Encased Electrode. **An electrode encased
by at least 50 mm (2 in.) of concrete, located within and
near the bottom of a concrete foundation or footing that is
in direct contact with the earth, consisting of at least 6.0 m
(20 ft) of one or more bare or zinc galvanized or other
electrically conductive coated steel reinforcing bars or rods
of not less than 13 mm (½ in.) in diameter, or consisting of
at least 6.0 m (20 ft) of bare copper conductor not smaller
than 4 AWG. Reinforcing bars shall be permitted to be
bonded together by the usual steel tie wires or other effective
means.
Just some additional code verbage for ya…:)…Greg is right on top of it and perfectly correct as usual…