If you need immediate service from a plumbing company, you should find one that happily offers it to their customers. Some even specialize in providing fast repairs and replacements. If you think you need this kind of immediate help, you should learn what to look for in a local business.
Frozen Pipes: When water in pipes freeze they expand and may even burst the pipe. Close the main shutoff valve. If the pipe has not split yet, thaw it with hot water bottles from the end of the pipe nearest to the tap. Thawing must be gentle, never with a naked flame, to avoid thermal water expansion that too can split the pipe. As a preventive maintenance make sure your pipes are appropriately insulated against the cold months.
Second, do you have the knowledge required to solve leaking pipes/faucets and clogged drain problems? You should be able to understand the parts of the faucet, pipes, and drain. Various types of faucets are sometimes designed to function very differently. You should know how to dissemble it replace the busted part and slow drain put it back together again. If the problem is in the pipes, you should know which one you have to remove and replace.
For instance if you are looking for a Trustworthy plumber, you can post a tweet in Twitter and ask for referrals. Be careful of spammers who may connect with your keywords. Trust the comments that come from within your network.
Your septic tank has to be emptied sometimes, and there's no easy answer to when it should be done. It depends on the size of the tank and the (sorry to mention it) consistency of the stuff going into it. Basically, if the septic tank isn't pumped out regularly, it will cause you thousands of dollars worth of problems. Ask your Local plumber for advice on your septic tank maintenance.
Watch what you put in your drain. Many commercial cleaners and solvents contain harsh chemicals that can damage your septic system. Always use an EPA-approved green drain cleaner. Be careful never to put grease, fat, or oils into your garbage disposal.
Once you have become a master plumber you can start your own plumbing company or you can even work for the government. This may sound like it is going to take forever to become a master plumber and it is difficult to achieve this level but it is not. Yes, it is going to take several years but the prestige title at the end is worth it.