You may want to write up a one page addendum to your contract that you can include with your contract for those who have the Galvanized piping. this addendum would state the risks inherent with working on these older pipes, have them sign off that they've been notified. This is something I'd have them sign once you have the job and are on site.
This might also be an opportunity. You could provide an "optional" service contract in this addendum that will allow someone in this situation to pay you a monthly retainer of $X for a year in lieu of labor costs and travel fee's and maybe some dicounted % on materials.
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