What is the Davis-Bacon prevailing wage for a plumber in Idaho?

There is no single figure. Active federal determinations for Idaho publish 29 plumber classification rates ranging from $8.50 to $44.57 per hour before fringe benefits. The rate that applies depends on the county, the type of construction and the wage determination incorporated into the contract.

How many counties in Idaho have a published plumber rate?

44 of the counties covered by active federal determinations list at least one plumber classification.

Do these rates apply to state-funded projects?

No. These are federal Davis-Bacon rates, which apply to federally funded or assisted construction. Idaho may set its own prevailing wage rates for state and locally funded work; the state law summary is on the Idaho prevailing wage page.

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Plumber prevailing wage rates in Idaho

Federal Davis-Bacon rates published in 28 active determinations, 2026

Active federal Davis-Bacon determinations for Idaho publish 29 plumber classification rates, across 28 determinations covering 44 counties.
Those published base rates run from $8.50 to $44.57 an hour before fringe benefits. Which one applies to a job depends on its county, its construction type and the determination written into the contract.
Construction types covered: Building, Heavy, Residential.
Last determination revision affecting plumber rates in Idaho: 2026-05-18.

The official source: binding Davis-Bacon and Service Contract Act wage determinations are published by the U.S. Department of Labor at SAM.gov Wage Determinations. This site indexes them and links every determination to its official document - the determination incorporated into a contract governs.

This page collects every classification in Idaho's active federal determinations that is a form of plumber work (potable water, waste and gas piping) and shows the rate published for it. Determinations name a classification the way the underlying union agreement or wage survey named it, so the wording varies between them; the rate and the fringe are reproduced exactly as published.

Published rates by determination

ID20260001 rev 1 · Residential · Ada, Boise, Canyon, Elmore, Gem, Owyhee and 2 more

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$10.82	0.00	SUID1983-001 DOL wage survey rate

Official document: ID20260001 on SAM.gov.

ID20260002 rev 1 · Residential · Adams, Custer, Idaho, Lemhi, Valley

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$9.95	0.00	SUID1981-002 DOL wage survey rate

Official document: ID20260002 on SAM.gov.

ID20260003 rev 1 · Residential · Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah and 2 more

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$8.50	0.00	SUID1981-003 DOL wage survey rate

Official document: ID20260003 on SAM.gov.

ID20260004 rev 1 · Residential · Bingham, Bonneville, Butte, Clark, Fremont, Jefferson and 2 more

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$11.25	0.00	SUID1981-001 DOL wage survey rate

Official document: ID20260004 on SAM.gov.

ID20260005 rev 1 · Residential · Bannock, Bear Lake, Caribou, Franklin, Oneida, Power

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$9.86	0.00	SUID1979-001 DOL wage survey rate

Official document: ID20260005 on SAM.gov.

ID20260006 rev 1 · Residential · Blaine, Camas, Cassia, Gooding, Jerome, Lincoln and 2 more

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$12.92	0.00	SUID1989-001 DOL wage survey rate

Official document: ID20260006 on SAM.gov.

ID20260007 rev 1 · Residential · Nez Perce

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$8.50	0.00	SUID1982-001 DOL wage survey rate

Official document: ID20260007 on SAM.gov.

ID20260008 rev 1 · Building · Benewah

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$44.57	26.58	PLUM0044-005 collectively bargained (union) rate

Official document: ID20260008 on SAM.gov.

ID20260009 rev 2 · Building · Blaine

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$39.90	18.67	PLUM0296-003 collectively bargained (union) rate

Official document: ID20260009 on SAM.gov.

ID20260010 rev 1 · Building · Bonner

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$44.57	26.58	PLUM0044-005 collectively bargained (union) rate

Official document: ID20260010 on SAM.gov.

ID20260011 rev 1 · Building · Boundary

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$44.57	26.58	PLUM0044-005 collectively bargained (union) rate

Official document: ID20260011 on SAM.gov.

ID20260013 rev 2 · Building · Caribou

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$36.75	18.93	PLUM0648-004 collectively bargained (union) rate

Official document: ID20260013 on SAM.gov.

ID20260014 rev 1 · Building · Clearwater

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$44.57	26.58	PLUM0044-005 collectively bargained (union) rate

Official document: ID20260014 on SAM.gov.

ID20260015 rev 1 · Building · Latah

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$44.57	26.58	PLUM0044-005 collectively bargained (union) rate

Official document: ID20260015 on SAM.gov.

ID20260016 rev 2 · Building · Madison

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$36.75	18.93	PLUM0648-004 collectively bargained (union) rate

Official document: ID20260016 on SAM.gov.

ID20260017 rev 2 · Building · Minidoka

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$36.75	18.93	PLUM0648-004 collectively bargained (union) rate

Official document: ID20260017 on SAM.gov.

ID20260018 rev 1 · Building · Shoshone

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$44.57	26.58	PLUM0044-005 collectively bargained (union) rate

Official document: ID20260018 on SAM.gov.

ID20260019 rev 2 · Building · Twin Falls

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$39.90	18.67	PLUM0296-003 collectively bargained (union) rate

Official document: ID20260019 on SAM.gov.

ID20260020 rev 1 · Building · Adams, Elmore, Payette, Valley, Washington

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$39.90	18.67	PLUM0296-003 collectively bargained (union) rate

Official document: ID20260020 on SAM.gov.

ID20260021 rev 2 · Building · Bear Lake, Bingham, Fremont, Lemhi, Oneida, Teton

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$36.75	18.93	PLUM0648-004 collectively bargained (union) rate

Official document: ID20260021 on SAM.gov.

ID20260022 rev 2 · Building · Camas, Cassia, Gooding, Jerome, Lincoln

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$39.90	18.67	PLUM0296-003 collectively bargained (union) rate

Official document: ID20260022 on SAM.gov.

ID20260023 rev 2 · Building · Clark, Custer

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$36.75	18.93	PLUM0648-004 collectively bargained (union) rate

Official document: ID20260023 on SAM.gov.

ID20260024 rev 1 · Building · Idaho, Lewis

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (LEWIS COUNTY AND AREA N OF 46TH PARALLEL IN IDAHO COUNTY)	$44.57	26.58	PLUM0044-006 collectively bargained (union) rate
PLUMBER (IDAHO COUNTY, S. OF 46TH PARALLEL)	$39.90	18.67	PLUM0296-011 collectively bargained (union) rate

Official document: ID20260024 on SAM.gov.

ID20260034 rev 2 · Building · Power

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER	$36.75	18.93	PLUM0648-004 collectively bargained (union) rate

Official document: ID20260034 on SAM.gov.

ID20260040 rev 1 · Heavy · Bonner

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$37.71	23.44	PLUM0044-015 collectively bargained (union) rate

Official document: ID20260040 on SAM.gov.

ID20260054 rev 1 · Heavy · Lewis

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$37.71	23.44	PLUM0044-015 collectively bargained (union) rate

Official document: ID20260054 on SAM.gov.

ID20260060 rev 1 · Heavy · Shoshone

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$37.71	23.44	PLUM0044-015 collectively bargained (union) rate

Official document: ID20260060 on SAM.gov.

ID20260065 rev 1 · Heavy · Benewah, Clearwater, Latah

Classification as published	Base rate	Fringes	Rate schedule
PLUMBER (ZONE 1)	$37.71	23.44	PLUM0044-015 collectively bargained (union) rate

Official document: ID20260065 on SAM.gov.

Where to go next

Plumber rates in every state · Idaho prevailing wage and state law · Idaho determinations by county · pay calculator

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