Supply  - Public, if visible and accessible

- piping to house, leak, pressure regulator, pressure/flow, lead

Private

pump, tank

- visible leak, rust, relief valve (no pressure test)

main shut off valve / isolating valve

- visible leak, damaged, handle, meter, (no pressure test)

piping

- visible leaks, rust, cross connections, support, pressure, steel, lead, polybutylene

water heater

- wiring, elements, combustion air, controls, adjustment, valve, leak, drip pan, old

tank

- rust, visible leak, soot, relief valve, discharge tube, location

exhaust flue/damper/draft hood

- rust, connections, support, location, clearance from combustibles, exhaust gases, aluminum

circulation system

- inoperative, pump

Waste - Public / Private

- odor, backup, clean out, unsealed openings

piping

- visible leaks, slope, obstructions, rust, support

traps/floor drain

- visible leak, S-trap, corroded, not visible

venting

- auto-vent, too short/tall, frost, suspect, siphon, diameter

solid waste pump / laundry tub pump

- inoperative, leak

sump pump

- inoperative, visible leak,  clogged, discharge

Fixtures

sink/basin

- leak, cracked, rust, chipped, slow drain, airgap, eventual updating likely

faucet

- leak, inoperative, loose, stiff, drip, handle, shower head, diverter, vegetable sprayer

toilet

- leak, inoperative, loose, running, slow flush, cracked, floor damage, mechanism

bathtub/bathtub enclosure

- leak, tile, caulk, grout, window, damage, rust, drain slow, doors

shower stall

- leak, tile, calk, grout, loose, door, possible concealed damage, door

whirlpool bath

- hand held shower, GFCI, pump, leak, settlement, noisy, motor access, switch

bidet

- leak, cracked, loose

sauna

- inoperative

bathroom/kitchen fan

- inoperative, discharge outside, noisy, desirable, ductwork

outdoor faucet

- leak, damage, shut off, loose

laundry tub

- leak, damage, cracked, concrete, loose, slow drain

gas piping

- leaks, material, support, rust, bonding, installation