Every two years. Registered plumbing contractors renew their licenses by August 31 of odd-numbered years. Certified plumbing contractors renew their licenses by August 31 of even-numbered years.
Read MoreEvery two years. Registered plumbing contractors renew their licenses by August 31 of odd-numbered years. Certified plumbing contractors renew their licenses by August 31 of even-numbered years.
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