The ordinance in question was enacted in purported pursuance of Sections 737 and 737-a, Code Supplement, 1913. Section 737-a confers power upon cities to regulate and license plumbers; to create a board of examiners t'o determine the qualification thereof; to prescribe rules and regulations for the installation of plumbing work and materials; to provide for the inspection of such work, materials, and manner of installation, etc. The city enacted an ordinance, Section 1 of which is as follows:
“Any person desiring to engage in the contract business of plumbing in the city of Sioux City shall first make application to the department of public safety of said city of Sioux City upon blanks furnished by said department, stating that he desires a license as a master plumber, or that he is engaged in or desires to engage in the contract plumbing business and employ licensed plumbers, presenting with his application a receipt from the city treasurer fop $50 as a plumbing contractor -authorized to employ licensed plumbers, or as a master plumber, and $1.00 as a journeyman plumber, if seeking employment, or if employed by a master plumber or contract plumber, and shall pass a satisfactory examination before the examining board provided for in Section 2 hereof.”
Section 62 provides as follows:
“All licensed plumbers shall be held responsible for the acts of their agents or employes done under and by virtue of his or their license. All licenses shall expire on the 31st*786 day of March of each year, but uew licenses shall be issued .without further examination; the purpose and intent'being that only one examination shall be required of the same person. Any change of firm name or location must be promptly reported to the department of public safety. The license shall be posted in a conspicuous place in the office, store, or place .of business of the licensee. When two or more persons are copartners, the license may be issued in the name of the firm or copartnership. No license shall be transferable.”
Tlie validity of the statute is not challenged. The validity of the ordinance is challenged-on two grounds:
(1) That it is unreasonable because the license fee exacted thereunder is excessive;
(2) That it is unreasonable because discriminatory.
The first ground of challenge is based upon the provision of Section 1, above quoted, which exacts a license fee of $50 for master plumbers. The second ground is based upon Section 62, in that it works alleged discrimination in favor of firms and corporations, as compared with individual persons.
I. . Is the ordinance unreasonable, as exacting an excessive license fee? Is the city, under guise of a license, imposing a tax? It will be noted that $50 is exacted only from the master plumbers. That there should be some system of public supervision of the plumbing of a city is not disputed. That such public supervision must involve a considerable expenditure is also self-evident. It appears that the plumbing equipment installed in the defendant city amounts annually to a total of from $250,000 to $300,000. The license fees collected in pursuance of the ordinance for the four-year period under consideration total about $3,600. Inspection fees,- the validity of which is not involved herein, total about $4,600. This makes an average collection from both sources of about $2,000 a year. The city employs a
It is one of the peculiarities of the situation that many of the plaintiff’s assignors were firms of two or more members, who had obtained licenses upon the payment of a single fee, and were, therefore, the beneficiaries of the favoritism