Maine Department of Environmental Protection employees are working with some homeowners to test their well water following the Aug. 19 firefighting foam spill at the Brunswick Executive Airport.

The 1,450 gallons of foam, which mixed with 50,000 gallons of water, contains PFAS chemicals linked to certain types of cancers and other health problems.

A Tuesday update from the DEP indicates the state will contact homeowners along Coombs Road from the southern intersection with Gurnet Road up to a quarter mile past the intersection with Hawkins Lane. The testing will include properties on Hawkins Lane and Purinton Road.

The testing of properties southeast of Hangar 4, where the spill occurred, will include water supplies up to about one mile away.

The DEP update also indicated that new samples of surface water are showing reduced levels of PFAS.

And while the agency will test some private wells, it reminds residents that the public drinking water supply to Brunswick Landing is safe. The public is advised not to touch foam if they see it.

Cleanup continued over the weekend, with the amount of foam gradually reducing, according to DEP.

Last week, residents packed town hall to ask questions about the spill and the cleanup, including why the hazardous firefighting foam was at the site and who will be responsible for covering the cost of the remediation.