Nassau Democrats face a crowded four-candidate primary in September for the 5th Legislative District seat being vacated by Laura Curran, who is running for county executive.

The Nassau Democratic Committee plans to nominate Freeport trustee Debra Mulé for the seat at its nominating convention on May 31, said party chairman Jay Jacobs.

Mulé, who served on the Freeport school board from 2006 through her election to the village’s board of trustees in 2015, said her campaign would focus on cleaning up corruption in local politics and fixing the county’s property tax assessment system.

“We all know the county is a mess and it is time to end the corruption and incompetence,” she said. “My experience as a school board member and Freeport Village trustee will be an asset to the district.”

Mulé faces a crowded field of candidates, including Anthony Miller, vice president of the Freeport school board; Jack McCloy, a Baldwin activist who unsuccessfully challenged Curran for the seat in 2013; and George Siberon, executive director of the nonprofit Hempstead Hispanic Civic Association.

Siberon, who announced his candidacy Thursday, is running on a ticket with County Comptroller George Maragos, who is challenging Curran of Baldwin and Assemb. Charles Lavine (D-Glen Cove) for the Democratic nomination for county executive.

Siberon of Baldwin pledged to bring “integrity” back to the legislature and said he would focus on the county’s heroin epidemic and increasing state funding for local schools.

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“I am tired of hearing of our elected officials being indicted, and our communities losing faith and trust in government,” said Siberon, who served as executive director of the county Youth Board during the administration of former County Executive Thomas Suozzi.

Miller, who has served on the school board since 2012, touted his experience advocating for the community on the local, state and federal levels.

“I believe my service to the community, both as an active community member and as an elected official have prepared me well for the job,” Miller said.

McCloy, who announced his candidacy last month, is a member of the Baldwin and Baldwin Oaks civic associations.

McCloy did not respond to a request for comment Friday, but his campaign website says he would reform the county’s red-light camera program and oppose utility fee hikes.

Nassau Republicans on Thursday nominated Kathleen Spatz, president of the South Hempstead Civic Association, as their candidate in the 5th District.

The district encompasses Baldwin, Freeport and parts of Merrick, Baldwin Harbor and South Hempstead.