Should be reported on ATIS.
If you have a modern runway surface in good condition (crowned and grooved, good drainage) you really shouldn't ever see standing water, except maybe in the heaviest of downpours.
Which reminds me: The only time I've actually hydroplaned was at Chennai, India where the runway seems neither crowned nor grooved but quite "rutted out" and they were experiencing heavy rain due to a tropical depression that was moving through.
In that case, standing water was reported on the ATIS and given a depth in inches.
Probably better to get a report from a previously arrived airplane.