BLADES, Del. — State environmental officials say more contamination has been found in private wells in a southern Delaware town where residents were advised last month not to drink the water.

Officials say sampling of 41 private wells in Blades has found elevated levels of perfluorinated compounds in three of them.

A fourth well had a PFC concentration below the Environmental Protection Agency’s health advisory of 70 parts per trillion, but close enough that the homeowner was provided with a carbon filtration system.

Meanwhile, officials were scheduled to hold a public meeting Thursday evening to discuss the water situation in Blades, where officials say a new carbon filtration has significantly lowered PFCs in the town’s three wells. All three wells were found last month to have PFC levels above the EPA advisory level.