Licensing in Hawaii
Two separate licenses: a C-37 contractor license and an individual plumber license
Hawaii is unusual: contracting requires a C-37 Plumbing contractor license from the Contractors License Board (DCCA, under HRS 444), while the people doing or supervising the work need their own Journey worker or Master plumber license from a different board entirely — the Board of Electricians and Plumbers (HRS 448E, HAR 16-80). Your site is built to show both plainly, because that pairing is exactly what an Oahu homeowner checks.