Okla. Stat. tit. 59, § 59-1017

The provisions of The Plumbing License Law of 1955 shall not

apply to:

1. Minor repairs, consisting of repairing or replacing faucets

or minor working parts of plumbing fixtures;

2. Farm buildings located outside any city or town unless such

buildings are connected to a public water or sewer system;

3. Maintenance work for state institutions and school

districts;

4. The installation, maintenance, repair, renovation of

automatic sprinkler systems and related mechanical appurtenances

beginning at a point where the pipe or piping system provides water

used exclusively for these automatic sprinklers and their related

appurtenances and to standpipes connected to automatic sprinkler

systems;

5. The construction, installation, maintenance, repair,

renovation, and/or removal of pipe or piping systems and related

mechanical appurtenances including backflow preventers, appliances

and/or equipment used in connection therewith, directly or

indirectly within or without any building or structure, from a point

or location in a source of potable water supply at which point or

location there exists any backflow preventer, provided that said

pipe and/or piping systems are for:

a. heating, except radiant-floor heating systems as

defined in subparagraph d of paragraph 9 of Section

1003 of this title,

b. cooling,

c. air conditioning,

d. refrigeration, or

e. boilers and other pressure vessels of whatsoever kind

and character.

A “backflow preventer,” as used herein, means any permanent

mechanical device, or combination of permanent mechanical devices,

of whatever material, which, after installation acts to prevent a

reversal of the normal directional flow of potable water within the

Oklahoma Statutes - Title 59. Professions and Occupations Page 885

piping system in which it is installed, and shall include, but not

be limited to, metal checkvalves and airgaps, either naturally or

artificially created. Provided, further, that the exclusionary

provisions of this paragraph shall apply only to and within

governmental agencies, counties, cities and towns which now have or

which hereafter may adopt separate laws relating to the licensing,

registration and regulating of persons engaged, for business

purposes, in any of the areas of trade hereinbefore specified in

this paragraph; the exemptions herein being provided to apply only

to these items specifically regulated by any such local laws and

ordinances; and

6. An individual who performs plumbing work on such

individual’s property of residence.