Naphthalene is an organic compound from coal tar and petroleum. It enters water from industrial discharges and mothball use. It can damage red blood cells and may cause cancer.

Naphthalene is a volatile organic compound (VOC) with a strong, distinctive odor. It's primarily derived from coal tar and petroleum during industrial processes. Besides mothballs, naphthalene is used in insecticides and plastics manufacturing. It can enter drinking water through industrial discharges or improper disposal of products containing naphthalene. Water utilities typically detect and measure naphthalene levels using gas chromatography techniques. To reduce exposure, proper disposal of naphthalene-containing products is crucial.