Last updated September 5, 2026
Everything you need to get into Plumbers & Steamfitters Local 398 (Pomona & San Gabriel Valley): whether apprenticeship applications are open right now, how the process works, and a free alert the moment the next window opens.
Applications are accepted year-round.
Official application page ↗Status last verified September 5, 2026. Source: official local/JATC site. Windows can change on short notice — always confirm details with the local before making plans.
Windows at competitive locals can cap out in days. We watch Rancho Cucamonga’s application status and email you the moment it opens — so you apply on day one, not day last.
We publish a journeyman rate only where the US Department of Labor has a union wage determination for the local — that figure is the local's own negotiated scale, because DOL adopts collective-bargaining rates wholesale. The counties covering Rancho Cucamonga, CA are on wage surveys instead, which are not union scale, so there is no rate here we can stand behind.
For reference, the median journeyman base across the 170 UA locals that do publish one is $46.10/hr — about $95,900/yr at 2,080 hours. Ask UA Local 398 directly for its current scale.
All 170 UA pay scales →UA Local 398 is based in Rancho Cucamonga, California. It represents and trains: Plumber, Pipefitter, HVAC/R.
Union hall: (909) 945-5557
From our last verification: UA Local 398 (Pomona & San Gabriel Valley, Rancho Cucamonga, CA) operates a State and Federal Certified five-year apprenticeship program for Plumber, Pipefitter, and HVAC/R trades. The official apprenticeship page describes the program on an ongoing basis with no published application window or deadline dates; applicants are directed to the members-apprenticeship page for details on wages, OJT tracks (Plumber, Fitter, Service/Maintenance), and probationary terms. No evidence found of a closed or scheduled application period as of verification date.
Most UA locals rank applicants by aptitude-test score and fill seats from the top down. The applicants who get in prepped early — start with a free GAN-style practice test or the GAN aptitude test guide.
As of September 5, 2026: Applications are accepted year-round. Application schedules are set by the local and its training fund and can change on short notice — always confirm on the local's own site before making plans.
Applications go through the local's apprenticeship/training program (https://www.ajtraining.org/). The usual process: submit the application with your HS diploma or GED and ID, take the aptitude test, then complete a scored interview that sets your rank on the eligibility list.
UA Local 398 (Rancho Cucamonga, California) represents Plumber, Pipefitter, HVAC/R — its apprenticeship program trains those trades. If you want a different pipe trade, check the neighboring UA locals in the directory.
Most UA locals test applicants with the GAN aptitude battery — reading comprehension, numerical computation and reasoning, problem solving, paper folding, and mechanical comprehension — and rank candidates by score. Your test score plus interview decide your ranking, so prep before the window opens.
Or compare every California local side by side: union plumber pay in California.
Applying is step one — the aptitude battery and the scored interview decide your rank. Set this local in the app and your study plan gets paced to its deadline.
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PipePrep AI is an independent directory and study tool — not affiliated with, endorsed by, or connected to the United Association (UA), any UA local, any JATC or training fund, or GAN Human Resources. Application windows, fees, and requirements change constantly; always verify details on the local's own website before you act on anything here.