Aside from being sultry as a jungle in a lot of subsurface equipment rooms, if any chlorine or corrosives are used in water treatment, airborne vapors will corrode electrical gear in no time. You can often hear buzzing/chattering magnetic starters with their very rusty pole faces from about 200 yards away.
[Notice in pic 3 that someone accidentally installed a ‘raintite’ A-B enclosure with deluxe driphood.]
