Prevailing wage is a legal pay floor, not a bonus: on federally funded or assisted construction contracts over $2,000, the Davis-Bacon and Related Acts require contractors and subcontractors to pay covered workers at least the locally prevailing wages plus fringe benefits.
For a plumber or HVAC tech on those public jobs, the wage determination on the project sets the minimum your check is built on.
Here is how coverage works, how to find the rate, and what to check if your pay falls short.
What prevailing wage is
Prevailing wage is a minimum, and the law sets it per job.
The Davis-Bacon and Related Acts apply to contractors and subcontractors on federally funded or assisted contracts over $2,000 for construction, alteration or repair — the Act's language includes painting and decorating — of public buildings or public works.
Covered workers must be paid at least the locally prevailing wages and fringe benefits.
Your employer can pay above that floor, never below it.
"Locally prevailing" does real work in that sentence.
The rate is set for the locality where the work is performed, so the same work can carry different minimums in different places.
There may be a second layer beneath the federal one: state prevailing-wage laws — often called little Davis-Bacon acts — for state and local public works.
Our research could not verify them: the federal listing we would normally cite was inaccessible when we researched, so we can't confirm which states have an act or what any state's thresholds and rates are.
For a state, county or municipal job, ask your state labor department whether one applies and what it requires.
The federal rules also move.
The U.S. Department of Labor's 2023 update to the Davis-Bacon regulations is, as of September 2026, in effect except for three provisions blocked by a 2024 federal court injunction — the material-supplier distinction, truck-driver onsite coverage and the operation-of-law clause — so older summaries you find online may not match today's rules.
These are legal minimums, and they change
Which jobs pay it
The trigger is the contract, not the trade.
Davis-Bacon reaches contractors and subcontractors on federally funded or assisted contracts over $2,000 for construction, alteration or repair of public buildings or public works — so plumbing and HVAC work on those projects is covered when your employer holds the contract or works under one as a subcontractor.
What matters is which job you're sent to: the Acts apply to contractors and subcontractors performing on a covered contract, so the prevailing-wage floor goes with that contract's work.
Overtime has its own layer on bigger jobs.
On Davis-Bacon contracts over $100,000, the Contract Work Hours and Safety Standards Act requires time-and-a-half for hours over 40 in a workweek — separate from, and on top of, the wage-and-fringe floor.
State and local public works are the other place this pay shows up.
States may run their own prevailing-wage laws for those projects — our research could not verify the state-by-state coverage or thresholds, so we won't guess them: ask your state labor department whether your state has an act and what it covers.
How to look up the rate
The number you're owed lives in the wage determination — the rate sheet for the contract.
It carries the wage rate for the work, set for the project's locality.
Apprentice rates are a separate layer that does not come from the determination: a registered apprenticeship program sets them as percentages of the journeyworker hourly rate (29 CFR 5.5(a)(4)(i)).
You can look one up yourself.
The public route our research identified for checking a specific package is pulling the Davis-Bacon wage determination for the project's county on SAM.gov — though we did not pull individual determinations in our research, so treat any figure you find as a starting point and confirm the determination that covers your project.
The simpler step is to ask your employer or the agency that let the contract which wage determination applies to the job, and to read the rate for the work you do against your pay.
If you're an apprentice, registration is the gate.
You may be paid below the journeyworker rate only if you're individually registered in a program registered with the U.S. Department of Labor's Office of Apprenticeship or a recognized state apprenticeship agency, and the percentage you're paid is the one your registered program sets.
The ratio matters too: the apprentice-to-journeyworker ratio in each craft may not exceed the program's ratio, and on a job outside your program's home locality, the ratios and wage percentages of the project's locality apply.
Don't benchmark a determination against BLS wage tables — they're different series.
The latest federal wage data (OEWS May 2025, released May 15, 2026) put the trade-wide median at $30.67 an hour ($63,800 a year) for plumbers, pipefitters and steamfitters (SOC 47-2152) and $29.33 an hour ($61,010) for HVAC mechanics and installers (SOC 49-9021).
Those are survey medians for the occupation as a whole, and OEWS excludes overtime pay and benefits entirely — so they are background on the trade, not the public-works rate.
The state-by-state tables on our plumber salary page are that same OEWS series.
Fringe paid as cash
A prevailing-wage package has both parts from day one: the Davis-Bacon requirement is at least the locally prevailing wages and fringe benefits.
The wage is the hourly number; the fringe is the rest of the required minimum.
Quoting a public job by its wage line alone understates what the contract owes you.
The question workers ask next is whether the fringe arrives as a benefit plan or as extra money in the paycheck.
Here our research runs out: we verified the requirement's wage-plus-fringe structure, but not the rules for paying the fringe as cash in place of benefits, and not which benefits a particular job's fringe covers.
Before you value an offer, ask your employer, the agency that let the contract, or the Department of Labor's Wage and Hour Division what the fringe on your project covers.
If you're weighing public work against a union shop, compare package against package on both sides: our guide to union scale covers the wage-versus-total-package split for plumbers, and there's a parallel guide to union HVAC scale for the refrigerant side.
If you're underpaid
Start with the document.
Get the wage determination that covers your project, find the rate for the work you do, and read it as a package: the wage and the fringe benefits together are the minimum.
Check your pay stubs against both parts for the hours you worked the covered job.
Apprentices have specific checks.
Registration: if you're not individually registered in a DOL- or state-registered program, you can't be paid the apprentice percentage — the full wage-determination rate is due for the work you performed.
Ratio: an apprentice working above the allowed apprentice-to-journeyworker ratio must be paid the full wage-determination rate for the work actually performed.
Locality: outside your program's home locality, the project locality's ratios and wage percentages govern.
Hours count as well.
On Davis-Bacon contracts over $100,000, time-and-a-half is required for hours over 40 in a workweek — so a short check can be a rate problem, an overtime problem, or both.
If the numbers don't line up, keep your own records — hours, pay stubs, the project and the contractor — and raise the discrepancy with your employer.
Our research did not verify the complaint process, so we won't script it; an unresolved question can go to the agency that let the contract, to the Department of Labor's Wage and Hour Division — the office whose Davis-Bacon guidance this page is built on — or to both.
For a state or local job, start with your state labor department.
Career information, not legal advice. Davis-Bacon coverage, wage determinations and fringe rules are administered by the U.S. Department of Labor, and state prevailing-wage rules — where a state act applies — by each state. Confirm your situation with the Wage and Hour Division or your state labor department before you act.
Confirm the determination before you act on it