A single slow drain is usually a local clog: hair in a tub drain, grease and food in a kitchen line, or soap scum building up in a bathroom sink. When several fixtures drain slowly at once, or water comes up in the shower when you flush, the blockage is more likely further down in the main line. That difference matters, because it changes what the plumber needs to bring.
Haygood Plumbing connects you with an independent plumber in Davis, CA who handles drain cleaning. For most clogs, the plumber who takes your job will run a drain snake (also called an auger) through the line to break up or pull out the blockage. Kitchen lines packed with grease may need a larger cable or a water jetting machine. If clogs keep coming back, the plumber may suggest a camera look at the line to check for a deeper problem.
Try to avoid pouring chemical drain openers into a fully blocked drain before the plumber arrives. They often do not clear a solid clog, they can sit in the pipe and trap, and they make the job harder and less safe for whoever opens the line next. A plunger is fine for a toilet or a single sink.
When you call, mention which drains are affected, whether anything was recently flushed or poured down, and whether your home is on city sewer or a septic system. It also helps to know where your cleanout is, often a capped pipe outside near the foundation or in a basement or garage.
Ask the plumber how they price the job, whether the quote covers one drain or the main line, and what they recommend to keep it from happening again.