Section 16-11-18 - Purity of gas(a) Every gas company supplying manufactured gas shall daily, except Sundays and holidays, test the gas for the presence of hydrogen sulphide in the manner specified in the following subsection.(b) The hydrogen sulphide in the gas shall be considered negligible if a strip of white filter paper moistened with a solution containing five per cent by weight of lead acetate is not distinctly darker than a second paper freshly moistened with the same solution, after the first paper has been exposed for one minute in an apparatus through which a stream of the gas is flowing at the rate of approximately five cubic feet per hour, the gas not impinging directly from the jet upon the test paper.(c) All gas sold for heating or lighting shall contain not more than thirty grains total of sulphur per one hundred cubic feet nor more than five grains of ammonia per one hundred cubic feet.(d) No gas shall contain impurities which may cause excessive corrosion of mains or piping or form corrosive or harmful fumes when burned in a properly designed and adjusted burner.(e) Every gas company producing more than one hundred million cubic feet of manufactured gas per year, containing sulphur or ammonia, shall provide and maintain such apparatus and facilities as are necessary for the determination of total sulphur and ammonia in the gas; and each such gas company shall at least once each month determine the amount of total sulphur and ammonia in the manufactured gas distributed by it.(f) When two or more communities are served entirely from a common supply of gas, the commission may permit tests for impurities to be made at a single suitable location.Conn. Agencies Regs. § 16-11-18