They did come out on Easter Sunday for an emergency blockage (house full of people) but I should have asked how much. Charged $498 to clear 25 feet of sewer line, which I was told was flat rate whether it was ten feet or a hundred feet. No mention of emergency service. At least they came within a few hours and got the job done. Here’s a hint- if you have an older system and have visitors from the city make sure you know what they are flushing!
There’s often an Allen wrench that comes with the garbage disposal. I keep it under the sink. When the thing jams, follow the directions in the manual, and I won’t need to come out. Another plumbing tip, don’t believe the myth about putting lemon peels in the disposal to make it smell better. That will just make it jam faster. These are the things you should never pour down the drain.
The word "plumber" dates from the Roman Empire. The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes and some were also covered with lead, lead was also used for piping and for making baths. In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall". Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.