What are the little black worms or larvae that came out of my whirlpool tub?

The little black worms or larvae you observed in your whirlpool tub are likely the larvae of drain flies or moth flies, which breed in stagnant water and decaying organic matter. They are typically harmless but can indicate a Plumbing issue or buildup of organic material in your plumbing system. To eliminate them, ensure the tub is regularly cleaned and that there is no standing water. Additionally, you might want to check and clean your drains to prevent future infestations.