It is best to water your composting worm bins in frequent light applications using a misting or spraying system instead of heavy infrequent or pouring water in your worm bin. The first 5 inches where most earthworm activity will be greatest should have the highest concentration of moisture. Under the main moisture area will be your worm castings. You don't want soggy anaerobic worm casting which smell foal but worm casting that smell earthy.
