Illinois Plumbing Workforce and Industry Statistics

The Illinois plumbing sector represents one of the state's larger licensed skilled trades, with workforce size, wage levels, and employer counts tracked by state and federal labor agencies. This page covers the scope of the licensed plumbing workforce in Illinois, how employment and industry data are structured and reported, the scenarios in which workforce statistics are applied, and the decision boundaries that separate one classification category from another. These figures matter for workforce planning, apprenticeship program sizing, regulatory oversight, and economic analysis of the construction and building services sectors.

Definition and scope

Illinois plumbing workforce statistics encompass data on licensed journeyman plumbers, master plumbers, plumbing contractors, and apprentices operating under state and municipal licensing frameworks. The primary regulatory authority over plumbing licensure in Illinois is the Illinois Department of Public Health (IDPH), which administers the Illinois Plumbing License Law under 225 ILCS 320. The City of Chicago operates a separate licensing regime under the Chicago Plumbing Code and the Chicago Department of Buildings, meaning workforce data for Chicago-area plumbers may be classified and reported under distinct local categories.

The U.S. Bureau of Labor Statistics (BLS) tracks Illinois plumbing employment through its Occupational Employment and Wage Statistics (OEWS) program, which issues annual estimates for Standard Occupational Classification (SOC) code 47-2152 — "Plumbers, Pipefitters, and Steamfitters." This occupational group, as defined by BLS, includes broader pipe trade workers and is not limited to state-licensed plumbers alone. Researchers and policy analysts must account for this classification boundary when comparing BLS employment figures against IDPH licensee counts.

Scope limitations: This page covers Illinois-specific workforce and industry data only. Federal workforce programs, multistate labor statistics, and regulatory frameworks governing pipefitters or steamfitters as distinct from licensed plumbers fall outside the geographic and occupational scope addressed here. For the full regulatory landscape governing Illinois plumbing practitioners, see the Regulatory Context for Illinois Plumbing reference.

How it works

Workforce data for the Illinois plumbing sector flows from three primary reporting mechanisms:

State licensure records — IDPH maintains a registry of active plumbing licenses issued statewide. As of published IDPH data cycles, Illinois issues licenses in two primary classifications: Licensed Plumber (journeyman level) and Licensed Master Plumber, each with distinct examination and experience prerequisites detailed on the Illinois Plumbing License Types page.
Federal occupational wage surveys — The BLS OEWS program collects employer-reported payroll data from establishments in the construction, building services, and maintenance industries. BLS reports median hourly and annual wages by metropolitan and nonmetropolitan area, enabling comparisons between Chicago-Naperville-Elgin metro employment conditions and downstate Illinois labor markets.
Apprenticeship enrollment records — The U.S. Department of Labor Office of Apprenticeship registers apprenticeship programs through its RAPIDS system. United Association (UA) Local unions — the dominant organizing body for Illinois plumbers — report apprenticeship enrollment data to the DOL, which is then aggregated into state-level program statistics.

The interaction between these three data streams produces both overlaps and gaps. A registered apprentice appears in DOL enrollment data but may not yet hold an IDPH license. A licensed master plumber operating as a sole proprietor may not appear in BLS employer-payroll surveys if the establishment falls below BLS survey thresholds. Analysts referencing the Illinois Plumbing Workforce and Industry Data landscape must triangulate across all three sources to produce accurate headcounts.

Key data publication cycle: BLS OEWS estimates are released annually, typically in May for the prior reference year. IDPH licensure records are updated on a rolling basis as renewals and new examinations are processed. The two datasets are therefore never perfectly synchronized.

Common scenarios

Workforce and industry statistics are applied across several distinct professional and policy contexts in Illinois:

Apprenticeship program sizing — UA locals and JATC (Joint Apprenticeship and Training Committee) administrators use IDPH licensure cohort data and BLS employment projections to calibrate the number of apprenticeship slots offered in a given cycle. The Illinois Plumbing Apprenticeship Programs pathway requires 5 years of documented on-the-job training under UA or equivalent JATC programs.
Wage determination in public contracts — Illinois prevailing wage law under 820 ILCS 130 requires that licensed plumbers employed on public works projects receive the prevailing wage rate established by the Illinois Department of Labor for the county in which work is performed. These rates are set using BLS and union collective bargaining agreement data.
Market analysis for contractor entry — Plumbing contractors evaluating new market entry assess BLS employment concentration statistics alongside the IDPH contractor registration database to gauge competitive density. Illinois requires separate contractor registration distinct from individual licensure; details appear on the Illinois Plumbing Contractor Registration page.
Policy research and workforce development funding — State workforce agencies, community colleges, and labor organizations use BLS employment projections — which through the 2022–2032 BLS outlook cycle projected approximately 2% growth for the plumber/pipefitter/steamfitter SOC nationally — to justify funding allocations for Illinois plumbing schools and training programs.

The Illinois Plumbing Union and Trade Associations sector also produces independently compiled workforce data through industry surveys conducted by organizations such as the Plumbing Contractors Association of Chicago and the Illinois Association of Plumbing-Heating-Cooling Contractors (IAPHCC).

Decision boundaries

Workforce classification in Illinois plumbing involves three boundary distinctions that frequently create analytical errors:

Licensed Plumber vs. Plumbing Apprentice
A Licensed Plumber (journeyman) holds an active IDPH credential and may perform work independently under a master plumber's supervision on permitted projects. An apprentice is enrolled in a DOL-registered program and works under direct supervision; the apprentice's labor hours count toward future licensure but are not independently credentialed. For the full examination and experience comparison, see Illinois Plumbing Journeyman vs. Master.

Licensed Master Plumber vs. Registered Plumbing Contractor
A Licensed Master Plumber credential certifies individual technical competency. A Plumbing Contractor registration is a business-entity authorization required to pull permits, enter contracts with clients, and employ journeyman plumbers. A master plumber who has not completed contractor registration cannot legally operate as a contracting business in Illinois, even with a valid individual license.

Chicago vs. Downstate Workforce Data
Because Chicago maintains its own licensing and permit systems independent of IDPH statewide administration, workforce counts for Chicago-licensed plumbers may not be reflected in IDPH statewide totals. The Illinois Plumbing Chicago vs. Downstate Differences page details the dual-system structure. Researchers must treat Chicago and non-Chicago Illinois as separate reporting universes when drawing workforce conclusions.

The Illinois Plumbing Authority index provides an orientation to all sector reference categories, including workforce-adjacent topics such as Illinois Plumbing Cost and Pricing Factors, which are directly influenced by licensed workforce supply and prevailing wage determinations.

References

📜 1 regulatory citations referenced · 🔍 Monitored by ANA Regulatory Watch · View update log

📜 1 regulatory citation referenced · 🔍 Monitored by ANA Regulatory Watch · View update log