Do the Standards of Practice require inspectors to report as deficient a plumbing fixture that does not fully drain, retaining a slight amount (such as a few cups) of residual water?
A properly constructed and properly functioning bathtub or shower should drain virtually all water (with the exception of minimal amounts that remain due to the surface tension of the water). Amounts beyond this that remain due to indentations or improper slope in the tub or shower (including shelves, ledges, etc.) constitute deficiencies and should be reported as such.