The Sonoma County Board of Supervisors on Tuesday unanimously approved a new labor contract covering the county's largest group of public safety workers, including correctional deputies and probation officers.

The deal, with the 470-member Sonoma County Law Enforcement Association, reduces total compensation costs, including wages and benefits, by 2.25 percent over the life of the agreement. The county's goal going into negotiations with rank-and-file groups was 3 percent.

Taxpayers savings from the deal are estimated at $1.5 million a year.

The law enforcement association represents correctional counselors, probation officers, park rangers, emergency dispatchers, fire inspectors and some investigative posts.

The 29-month contract will continue a five-year salary freeze for an additional 16 months in exchange for wage increases in the final 13 months.

It would shift some county pension costs to employees, curtail pension spiking moves and reduce or eliminate a total of five of the group's 17 wage premiums, which enhance daily pay and pensions for different skills, posts, certifications and shifts.

The concessions are similar to those in a labor agreement earlier this year with the county's largest labor union, which also settled for an overall 2.25 percent cut in total compensation.

Eight bargaining units, including those for sheriff's deputies, prosecutors, engineers and public defenders, remain at the negotiating table.