Incumbent supervisors in Smithtown and Huntington held off challengers to win Republican primaries Tuesday, highlighting a dozen races in Suffolk County.

Smithtown Supervisor Ed Wehrheim totaled about 55% of the vote to defeat Suffolk Legis. Robert Trotta, who totaled 45%, with all elections districts reporting at about 11 p.m., according to unofficial results from the Suffolk County Board of Elections. 

Huntington Supervisor Ed Smyth defeated Brooke Lupinacci. Smyth also won a Conservative primary against Dominic Spada.

Smyth totaled 61% of the vote compared with 39% for Lupinacci, with all districts reporting, unofficial results show. In the Conservative primary, Smyth totaled 71% of the vote compared with 27% for Spada, with all districts reporting.

At Napper Tandy’s in Smithtown, Wehrheim’s supporters declared victory around 10 p.m. Wehrheim thanked them for their work on the campaign trail. Surrounded by cheering supporters and his family, he accused Trotta of running a negative campaign that “put his family through hell.”

Pointing to his family, Wehrheim vowed to continue working “to make Smithtown a wonderful place to raise a family like this family right here."

Trotta conceded around 10 p.m. and left Wehrheim a voicemail congratulating him, he said.

“It’s democracy and I’m going to enjoy my family,” Trotta told Newsday. “I haven’t seen my wife and daughter so happy … just that there’s no more politics.”

At the American Legion Hall in Halesite where Smyth supporters gathered, the Huntington supervisor said his win is "a victory of truth over lies. I feel vindicated by this election.”

After thanking a cheering crowd, Smyth told Newsday that he never doubted his victory. “I knew I was right on the issues, I knew I would ever get outworked on the campaign trail and I know that the residents of Huntington focus on the issues, and the hyperbole and nonsense dished out during the campaign was easily dismissed by the voters.”

He said residents are focused on their taxes, public safety, quality of roads and infrastructure in the town, and parks, beaches and garbage collection. 

“We have a strong record of delivering on those issues,” he said.

Lupinacci could not be reached for comment.

Two primaries were held for seats in the Suffolk County Legislature in districts where the current Republican legislators, including Trotta, are term-limited.

In District 14, which includes parts of Babylon Town, Lindenhurst Village Deputy Mayor Richard J. Renna defeated Shawn S. Cullinane, the village prosecutor for the Village of Brightwaters Justice Court. Renna totaled 67% of the vote compared with 33% for Cullinane with all districts reporting.

“This campaign has been a team effort from Day One, and I’m so grateful to everyone who knocked on doors, made calls, put up signs, or just believed in me. ... Now it’s on to November — let’s finish what we started,” Renna said.

In District 13, which includes parts of Huntington and Smithtown, retired NYPD Det. Salvatore Formica defeated Frank Black, a building trades supervisor for the Town of Huntington. Formica totaled 59% of the vote compared with 42% for Black with all districts reporting.

The general election is Nov. 4.

Voters cast their ballots on a day of record-setting temperatures where the heat index soared into triple digits.

The voter turnout totaled about 12%, on par for primary elections, according to Republican Board of Elections Commissioner Betty Manzella.

She said no heat-related issues were reported.

“Although a few poll workers left by the afternoon, our poll worker staff were real troopers under these difficult and uncomfortable circumstances,” she said in an email.

Suffolk County Fire, Rescue and Emergency Services staff members distributed 32 fans to polling locations and supplied 48 cases of water, Manzella said.

In Huntington, the supervisor primary centered over a disagreement between incumbent Smyth and Lupinacci, a town board colleague, over future development.

Since last spring, when a plan for the Melville Town Center Overlay District was publicly unveiled by Smyth, Lupinacci has opposed the idea. 

The plan is to use the overlay district to encourage developers in the designated area south of the Long Island Expressway to convert to mixed-use buildings to help create a walkable downtown of housing and businesses. Lupinacci said more research needed to be done and voted no when it was approved in December.

In Smithtown, the Republican primary between incumbent Wehrheim and Trotta centered around several issues, chief among them how development should proceed in Kings Park.

Trotta had pointed to several projects in that community that are pending approval — such as a multimillion-dollar apartment complex near the LIRR train station — that he saidwould be detrimental toward the quality of life. 

He called for scaling back high-density housing while focusing more on making the downtown area more aesthetically pleasing with better signs and lighting, as well as burying power lines underground.

Wehrheim has defended his administration’s approach to development, noting that Kings Park has needed an economic boost since the Kings Park Psychiatric Center — once a large local economic driver for the area — closed in 1996. Boosting the housing supply in Kings Park is central to its downtown revitalization, Wehrheim previously told Newsday.

In other town races:

Maria Delgado defeated Cooper Macco in a Working Families primary for Town of Huntington supervisor with 78% of the vote, with all districts reporting, according to unofficial results. Macco is the Democratic supervisor candidate.

Chris Haines defeated Democrat Vincent Colavita in a Working Families primary for Huntington superintendent of highways. Haines totaled 77% of the vote, based on initial results.

In Smithtown, Thomas J. McCarthy and Lynne C. Nowick won the Republican candidacy for two town board seats. Both totaled 29%, while Robert Semprini and Joann Tierney-Varello each received about 21%, according to unofficial results.

In Huntington, David Bennardo totaled 32% and Gregory Grizopoulous 29% to win the Republican primary for town board. They defeated Eugene Cook and John Posillico, who each received about 19%.

Also in a Working Families primary for town board in Huntington, George Bergbuchler and Erick Greene each totaled 38% of the vote to win against Jen Hebert and Stephen Anastasia.

In Southampton, Democrat Mark Bernardo and Peter M. Collins were seeking the Working Families nod for town clerk. Collins had 10 votes; Bernardo had 9. And seeking two Working Families nominations for town board were Democrat Thomas F. Neely, Andrew Smith and Ieshia O. Galicia. Galicia had 12 votes, Neely had 11 and Smith, 10.

Newsday's Deborah S. Morris and Jean-Paul Salamanca contributed to this story.