MONMOUTH — A Maine textile manufacturer has started monitoring well water at more than two dozen homes around its Monmouth plant after the discovery of a contaminant at a new well last spring.

State environmental officials tell the Morning Sentinel that Tex Tech Industries has been regularly testing the water from 11 residential and 11 on-site wells since 1990, but last week was the first time about 25 to 30 other area household wells were tested.

Results are expected by the end of the year.

The contaminant, a chlorinated volatile organic compound, known as CVOC, was first discovered in well water near the Monmouth plant in 1987.

Tex Tech didn’t respond to multiple requests for comment.

The Portland-based company makes textiles for a variety of uses, including tennis balls and bulletproof vests.