What's in the water?

That's the worry in an area along the Rehoboth-Seekonk line, following the dumping of treated sewer sludge on a property there.

The issue goes back to early March.

Neighbors tell NBC 10 News that about 300 trucks came in over the course of several days.

The head of the Rehoboth conservation commission told NBC 10 that the trucks contained treated sewer sludge, and the material was dumped on a property off Almeida Road.

The head of the conservation commission, Robert Materne told NBC 10 that on March 9, he issued a cease-and-desist order to stop any more dumping, that the dumping was not approved and would not have been approved because it is a wetlands violation.

Materne calls it the biggest violation in his 20 years on the board.

Now the question persists, what's in the sludge? And is it contaminating the groundwater in the area, where residents rely on wells?

“I have a 2-year-old, a 9-year-old, and a 12-year-old. That is exactly my concern. We’re using the water there,” said Seekonk Selectman David Andrade, who lives across the street from the site.

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Andrade said he called the Massachusetts Department of Environmental Protection, and was told there are PFAS contaminants in the sludge material and that the DEP is investigating.

“Very frustrated with the situation, lack of information,” Andrade said.

Andrade wants more.

“You have some wetlands that were illegally filled. There are known contaminants in the fill material that was used. Why not get rid of it and mitigate any ongoing potential contamination besides that which has already been done?” Andrade told NBC 10 News.

Some neighbors have gotten notice of nearby contamination.

A nearby farmer told NBC 10 News that he’s concerned about the potential impact of the sludge on the water supply, which he uses to water his crops.

The owner of the land, Russell Pray, said he has no comment.

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Materne said the sludge was trucked in through a company called Earth Source, from the Raynham Park property, the old dog track.

Earth Source had an address on the Raynham Park property, but no working phone number.

It's unclear if it's even in business.

An NBC 10 message to the head of that company has not been returned.

NBC 10's messages left with the DEP have also not been returned.

Rehoboth town officials are holding a meeting on the issue Tuesday night, in part over frustration with a lack of information from DEP.