After a problem with the state's messaging service, the Iowa Department of Natural Resources has received a list from asphalt shingle recycler C6-Zero of the chemicals on site when its Marengo plant exploded burned in December.

Alyssa Brouillet, a spokesperson for the Iowa Attorney General's Office, told the Des Moines Register in an email Friday that the company provided the list to state lawyers Tuesday. She said company representatives had tried to electronically submit the list by a court-mandated Feb. 17 deadline, but "technical difficulties" delayed the Attorney General's Office from receiving the message.

The news comes after DNR Director Kayla Lyon told an appropriations subcommittee Monday that her department did not have C6-Zero's list of chemicals, despite the deadline that a judge set earlier this month. Local officials had previously told the Register that the company's leaders declined to provide a similar list in the weeks leading up to the Dec. 8 explosion, which sent 20 people to the hospital, forced evacuations of nearby homes and led to a nearly 20-hour firefight and contaminated of nearby water and soil.

When C6-Zero missed the DNR's deadlines for cleaning up the property, the company consented to a temporary injunction on Feb. 6. Iowa District Judge Lars Anderson ordered it to pay an environmental cleanup crew $334,000 and supply the state with a list of chemicals that were in the factory at the time of the explosion by Feb. 17.

“We don’t know yet as far as the type of material that they were using there," Lyon told the appropriations subcommittee Monday, three days after Anderson's deadline.

C6-Zero spokesperson Mark Corrallo denied Lyon's assertion.

"The information has been provided to the Iowa attorney general in accordance with a court-approved agreement," he said.

Corrallo did not respond to a follow-up email from the Register on Friday morning. The company has said its recycling process, which uses chemicals to break down shingles into usable oil and other components, is proprietary, and Anderson issued a restraining order blocking the public release of the chemical list.

In addition to the cleanup that C6-Zero is funding, the state agreed to pay up to $834,000 to the same environmental company to remove water from a nearby basin. The water contains PFAS, a long-lasting compound associated with health problems.

The state also agreed to spend about $600,000 replacing damaged firefighting equipment.

Tyler Jett covers jobs and the economy for the Des Moines Register. Reach him at tjett@registermedia.com, 515-284-8215, or on Twitter at @LetsJett.

This article originally appeared on Des Moines Register: Iowa DNR finally receives list of chemicals in C6-Zero plant fire