You won't always need to call a plumber to help you fix a nasty clog if you treat your pipes right. Don't use your toilet or kitchen sink like a trash can by stuffing hard to flush material down the drain or pouring fats and oils down the pipe. Throw coffee grounds and eggshells in the garage instead of in your sink. Also, only use your toilet to flush human waste and toilet paper, because any other materials could clog your commode.
For details about apprenticeship or other opportunities in this occupation, contact the offices of the state employment service; the state apprenticeship agency; local plumbing, heating, and cooling contractors or firms that employ fitters; or local union–management apprenticeship committees. Apprenticeship information is available from the U.S. Department of Labor's Apprenticeship program online, or by phone at 877-872-5627.
Most large cities today pipe solid wastes to sewage treatment plants in order to separate and partially purify the water, before emptying into streams or other bodies of water. For potable water use, galvanized iron piping was commonplace in the United States from the late 1800s until around 1960. After that period, copper piping took over, first soft copper with flared fittings, then with rigid copper tubing utilizing soldered fittings.