The City of Newburgh's test results indicating the presence of PFOS in a recent firefighting foam spill are accurate, the Department of Environmental Conservation confirmed on Tuesday.

The April 14 spill sent clumps of foam floating in the air over a New Windsor neighborhood and flowing in Silver Stream just south of Stewart International Airport for several hours.

In an email from a DEC spokesperson on Tuesday, the agency said the city's findings that the foam spill contained PFOS were confirmed by the agency's own "validated sample results."

The DEC has directed Atlantic Aviation to do additional testing of its own storage tanks to determine whether the PFOS was detected because of its presence in the foam itself, or if it was due to incomplete flushing of the storage tank, according to the email.

"DEC required the responsible party to sample the foam concentrate in the storage tank, and to sample throughout the impacted watershed to determine the extent of impact," the email read. "If violations are found, DEC will take any and all appropriate enforcement actions."

While there are ongoing concerns about PFOS contamination in the land and streams near the area's former water source, Lake Washington, news that the April 14 foam spill contained PFOS does not mean the water currently coming out of taps is contaminated.

The City of Newburgh switched from Lake Washington to the Catskill Aqueduct for its primary water source in 2016 after test results found PFOS levels above the EPA's health advisory level of 70 parts per trillion. The Catskill Aqueduct serves New York City and its water is subject to some of the strictest regulations in the nation.

Earlier on Tuesday, Newburgh City Manager Joseph Donat said the city was awaiting a response from the state to its own test results, and was planning to send a letter to Albany to remind them. Once the DEC revealed the agency concluded there was PFOS in the foam spill, Spectrum News reached out to Donat again.

Donat said he wants to move forward.

"The City was not made aware of the results," Donat wrote in a text message. "However, I would welcome the chance to continue to collaborate with the DEC. The results of both tests speak to the vulnerability of our watershed and critical nature of finding a permanent long term solution to this very serious issue."