The Washington State Patrol (WSP) is responsible for traffic law enforcement, collision investigation, criminal interdiction, terrorism prevention, and motorist assistance on the interstate and state highway systems.  Commissioned staff include a field force of 683 trooper positions and an estimated 250 commissioned nonfield force positions supported by the transportation budget.  As of November 2024 the estimated vacancy rate was approximately 23 percent. 

The Washington State Patrol Retirement System (WSPRS) is the retirement plan available to commissioned WSP employees.  Members of the WSPRS can retire at age 55 after five years of service or at any age after 25 years of service.  Years of service are calculated relative to the date the employee began service.  Members are subject to mandatory retirement at age 65 unless they are serving as the Chief of the WSP.

Compensation and personnel matters for troopers are collectively bargained between the state and the troopers' exclusive bargaining representative.

In 2024 the WSP longevity bonus program (bonus program) was established whereby eligible commissioned employees who have completed 26 or more years of service are qualified for an annual $15,000 longevity bonus on the employee's anniversary date of state employment.  The bonus program was effective July 1, 2024, and expires June 30, 2029.  The bonus is paid in four equal quarterly payments.

Eligibility for the bonus program is expanded to include commissioned employees who completed 26 or more years of service before July 1, 2024, and who have been continuously employed by the WSP for at least one year.

Under the expansion, an individual qualifies to receive a one-time retention incentive of $3,750 for each quarter the employee was continuously employed between the date the law went into effect and the employee's anniversary date.  These one-time retention incentive payments must be completed no later than June 30, 2025.