“I found this on our water while I was filling the tub”, states this reader in her query concerning the black worm pictured below. She is not sure if they are leeches or something else, and wants to know if it is harmful.

A beige-brown, striped worm was found by this reader, who wonders if we could tell her what it is. The worm was found in her toilet and she worries that it may be a parasite.

What looks like small, black worms were photographed by this reader, who wonders if they are grout worms. The photographs display organisms with an array of various body shapes; there are small curled up bodies, long straight ones and the last photograph is of what simply looks like a black dot.

Several gray-brown worms were found by this man’s son in their bathtub after not having been home for several weeks. Our reader, who is based in a basement apartment in London says he would appreciate any thoughts on what the worm is, how it got there, and how to prevent their return.