GREENLAND — Officials from the state Department of Environmental Services ordered the Coakley Landfill Group to “immediately provide bottled water” to a homeowner on Breakfast Hill Road whose well tested above a new standard for the suspected carcinogen 1,4-dioxane.

DES also ordered the CLG to provide the department with “recommendations for corrective action” within 30 days, according to a copy of a letter sent to Peter Britz, the city of Portsmouth’s environmental planner, who also serves as a staffer to the CLG.

“That would mean they would need to provide a long-term solution to the problem, which could be connecting somebody to a public water supply or providing a treatment system,” DES spokesman Jim Martin said Tuesday afternoon. “Bottled water is not considered a long-term solution.”

The Environmental Protection Agency describes 1,4-dioxane as “a likely human carcinogen.” An EPA fact sheet about the chemical states its is “found at many federal facilities because of its widespread use as a stabilizer in certain chlorinated solvents, paint strippers, greases and waxes.” The chemical, the EPA also states, “may leach readily from soil to groundwater, migrates rapidly in groundwater and is relatively resistant to biodegradation in the subsurface.”

The state in September set a new ambient ground quality standard for 1,4-dioxane of .32 parts per billion. The well on Breakfast Hill Road tested at .38 ppb, Martin said.

The CLG is made up of municipalities and private groups that used the Superfund cleanup site in Greenland and North Hampton, including companies that transported trash to it. Portsmouth is responsible for 53.6 percent of the CLG remediation costs and together the municipalities are responsible for more than 60 percent.

The landfill accepted waste from 1972 to 1982 and then incinerator waste until 1985. It was capped in 1998.

People living near the landfill have been concerned for several years that contaminants leaching from the site will contaminate their drinking water wells, especially since 1,4-dioxane and PFAS chemicals have been found at high levels in monitoring wells at the landfill.

State Rep. Mindi Messmer, D-Rye, who has pushed to have the CLG provide safe municipal water to homes around the landfill, called the DES action “definitely the right move.”

“It’s probably unfortunately going to happen with the Breakfast Hill Country Club, because they’ve previously tested above the new standard,” Messmer said Tuesday.

Martin said he expects DES will “test any well that previously had levels that would now be above the new “standard.”

Messmer called on the CLG to install a pump and treat system at the landfill.

“Clearly, this says the toxins are migrating offsite,” she said. “The problem is when are they going to be ordered to keep their contaminants on their property.”

Messmer believes the contamination of the Breakfast Hill well means it’s likely other wells will be contaminated.

“I think they should be compelled to stop the flow of toxins and install a treatment system at the landfill,” Messmer said. “Otherwise, what are they going to do: Just keeping putting treatment systems in people’s homes?”

Portsmouth City Attorney Robert Sullivan, who also chairs the CLG’s executive committee, could not be reached Tuesday for comment because he’s on vacation.

Deputy City Attorney Suzanne Woodland acknowledged Britz received the letter from the DES on Friday.

“The city of Portsmouth on Friday upon receipt of the letter provided bottled water to the residents,” Woodland said. “The CLG will have to consider the most effective remedy (for the home). In the interim the city of Portsmouth acted to provide water for the affected residents.”

She stressed she could not speak for the CLG.

City Manager John Bohenko could not immediately be reached for comment Tuesday evening.

Earlier this year, he told the Portsmouth Herald contaminants were not migrating from the landfill to private wells. “The water isn’t contaminated, the water isn’t contaminated,” he said at the time.

Former Assistant Mayor Jim Splaine stated that Bohenko sent a memo to the City Council several days ago about the contaminated well.

“What bothers me about the memo is it went to the City Council and not the general public, not unlike when I blew the whistle a couple of years ago that the city administration knew about the Haven well for almost a week before they told the public,” Splaine said Tuesday evening. “This information should be shared with everybody.”

“It shows me that the powers to be have something to hide,” he added.

Splaine predicted more homeowners around the landfill will discover that their wells are contaminated if the CLG “doesn’t put in some kind of pump and treat system at the landfill.”

“If we don’t do that we’re going to see much more pollution occurring in that area. It makes sense that whatever is under the cap of the Coakley landfill is eventually going to go in various directions when it hits the water table,” he said.