Identification should include situations when hydraulic conditions deviate from normal. This requirement is typically found in local/regional code or by city ordinance and inspected and determined by water suppliers.
IRC: Chapter 29 (https://codes.iccsafe.org/content/IRC2018P4) covers protection of potable water supply in section P2902.
Process/Skill Questions:
NCCER Standards:
Plumbing: Level 1