MINOT – Selectmen learned Monday night that arsenic levels in water from the town well appear to be rising, perhaps to the point where the water will need treatment.

Selectman Steve French told the board that the reading on a water sample sent to the Maine Drinking Water Program recently to test lead levels picked up an indication that arsenic may be present in concentrations as great as 13 parts per billion.

“That’s 3 pennies out of a pile of a billion more than it ought to be,” said French.

French explained that a few years ago, after it was determined that the Minot Consolidated School well required a $70,000 treatment system to eliminate problems with arsenic and radon, officials looked into running a line to the town well.

At that time, water at the town well, located near the town office complex, tested comfortably within limits.

“And its a great well. Delivers 171 gallons per minute,” said French.

While French said he couldn’t explain why arsenic would rise, he speculated that the added draw, the demand created by 300-plus students and faculty, might have something to do with it.

The water will be tested specifically for arsenic and, if it indeed does exceed public water supply standards, French said he will work with people in the Maine Drinking Water Program to devise a solution.

“I’ve already spoken with them. We’re not the only ones in this situation; the state people are trying to help us,” said French.

A system to filter out the arsenic could cost $15,000, French estimated. Disposal of the materials collected would add to that cost.

Selectman Dan Callahan said he wanted to explore every option before committing to a filtration system.

In other business, selectmen approved a code of ethics for all who serve on town boards and committees. They also signed for posting on Feb. 20, along with the town meeting warrant, the town’s new emergency management ordinance and amendments for the land-use ordinance.