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While not every clog has the same symptoms, the most common early sign that your main sewer line is clogged is that multiple drains in your home are draining slowly. You may also notice gurgling and odors from drains. If your plumbing system's drain cleanout is backing up with water, this is also a sign of a clog or blockage.

Plumbers use a variety of tools to help unclog the toughest of drain clogs, but the most common tools they use are drain snakes and augers. They try a plunger or drain snake to start, then move to heavy-duty augers, and finally try using a hydro jetter to blast away the clog with high-pressure water. Hiring a plumber to unclog a drain costs $125 to $300, largely depending on the extent and location of the clog and which of these methods is best for clearing it.

A liquid drain cleaner can sometimes make a clog worse over time if you use it improperly or too much. The chemicals in drain cleaners can corrode and damage pipes, causing cracks and leaks that may cause further blockages. If the clog is more than the liquid drain cleaner can handle, the cleaner will simply add chemicals to a bigger overall problem.

Your garbage disposal is not draining because it might have a clog due to food waste, a foreign object, grease, oil, fat, or it may have a broken motor. When water doesn't flush out of the disposal, that's a key sign that your disposal has a clog or needs repair.