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As of August 01, 2026, the average salary for a Diesel Maintenance Supervisor in Washington is $83,500 per year, which breaks down to an hourly rate of $40.
However, a Diesel Maintenance Supervisor's salary can vary significantly. Here’s a look at the typical salary range:
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Diesel Maintenance Supervisor Salaries by Percentile
| Annual Salary |
Monthly Pay |
Weekly Pay |
Hourly Wage |
|
| 75th Percentile | $92,900 | $7,742 | $1,787 | $45 |
| Average | $83,500 | $6,958 | $1,606 | $40 |
| 25th Percentile | $73,500 | $6,125 | $1,413 | $35 |
Republic Services - Seattle, WA
Prodigy Property Management LLC - Richland, WA
GRE Management LLC - Tacoma, WA
HOBAN & ASSOCIATES, LLC - Bothell, WA
A Diesel Maintenance Supervisor's salary isn't a fixed number. It's shaped by several important factors. Below, we'll explore how your years of experience, geographic location, and company size can directly affect your earning potential.
Experience is a primary driver of a Diesel Maintenance Supervisor's salary. As you build your skills and take on more complex tasks, your compensation generally increases. Here's how the average salary grows at different career stages:
| Job Role | Years of Experience | Average Salary |
|---|---|---|
| Diesel Engine Mechanic I | 0-1 years | $54,101 |
| Diesel Engine Mechanic II | 1-3 years | $60,804 |
| Diesel Engine Mechanic III | 3-5 years | $68,842 |
| Diesel Maintenance Supervisor | 5+ years | $83,441 |
What Am I Worth?
Your salary can change significantly depending on where you work. States with a higher cost of living and strong industrial sectors often pay more to attract Diesel Maintenance Supervisors. For example, consider the average annual salaries in these key locations:
Salaries can also vary between different cities. Major metropolitan areas or cities with a high demand for technicians often offer more competitive pay. Here are a few examples of average annual salaries in different U.S. cities:
Diesel Maintenance Supervisor salary potential scales significantly with company size. Data shows that Enterprise companies (5,000+ employees) pay the highest average salary at around $93,473. While startup companies pay approximate $79,076.
| Company Size | Employees | Average Salary |
|---|---|---|
| Startup | 1~50 | $79,076 |
| Growth Stage | 51~500 | $83,633 |
| Established | 501~5000 | $90,265 |
| Enterprise | 5000+ | $93,473 |
For Diesel Maintenance Supervisor roles, the industry you choose can affect earning potential by as much as 100% (the gap between the highest and lowest paying industries). Data shows that the Financial Services and Aerospace & Defense sectors offer the strongest compensation, at 50% above the average. In contrast, Diesel Maintenance Supervisor positions in Hospitality & Leisure or Transportation typically offer lower base pay, as these industries often view Diesel Maintenance Supervisor as a support function rather than a direct revenue driver.
| Industry Sector | Average Annual Salary | Average Hourly Rate | Pay vs.Avg |
|---|---|---|---|
| Financial Services | $125,250 | $60.0 | 50% |
Understanding how a Diesel Maintenance Supervisor's annual salary breaks down can help with budgeting. Below, you can see the average hourly rate, weekly pay, and monthly pay for this role. Use the buttons to switch between different pay periods.
| Annual Salary | Monthly Pay | Weekly Pay | Hourly Wage | |
|---|---|---|---|---|
| 75th Percentile | $92,900 | $7,742 | $1,787 | $45 |
| Average | $83,500 | $6,958 | $1,606 | $40 |
| 25th Percentile | $73,500 | $6,125 | $1,413 | $35 |
For a Diesel Maintenance Supervisor, the most direct path to higher earnings is advancing to the Truck Service Shop Operations Manager role. This promotion typically comes with a significant pay increase, bringing the average annual salary to $103,200 - a projected growth of 24% over your current level.
Ready to take the next step in your career? Browse thousands of current Diesel Maintenance Supervisor job openings on our job board. Use the search bar below to find your perfect match.
Simpson Door Company
Mccleary, WA
Simpson Door Company | Mccleary, WA
Description:Drives the day to day strategic and tactical direction for the maintenance department.Guide and direct the activities of the maintenance staff ... more
6 Days Ago
Cornerstone Residential
Federal Way, WA
Cornerstone Residential | Federal Way, WA
Job TypeFull-timeDescriptionABOUT US:Cornerstone Residential is a comprehensive property management company committed to providing exceptional service whil... more
6 Days Ago
Maple Leaf Foods
Seattle, WA
Maple Leaf Foods | Seattle, WA
Any MLF team member interested in being considered for this role are encouraged to apply online by January 28. Applications received beyond that date are n... more
6 Days Ago
Everett Public Schools
Everett, WA
Everett Public Schools | Everett, WA
Position Type:Professional Technical/Maintenenance SupervisorDate Posted:12/11/2025Location:Maintenance and OperationsClosing Date:Open until filled8.0 Hou... more
6 Days Ago
Fairfield Residential
Kirkland, WA
Fairfield Residential | Kirkland, WA
Maintenance SupervisorOur On-Call Maintenance Associates can benefit from a 40% apartment allowance if living on-site at the property for which they work.O... more
6 Days Ago
Low Income Housing Institute
Seattle, WA
Low Income Housing Institute | Seattle, WA
Maintenance SupervisorRoving, Greater Seattle AreaReports to: Facilities DirectorWork Schedule: Monday through Friday 7:30am to 4:00pm. Full-time, 40 hours... more
6 Days Ago
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