Plumbing requirements in Azusa can vary a lot, and their solutions often need the specific expertise of different types of plumbers. The first type we'll consider is probably the most well-known: the residential plumber. These are the experts you call when you have a serious plumbing problem in your home—when your basement is flooding, or when your toilets won't flush. They're also the folks you call when the problem isn't quite that dire, but still requires a bunch of plumbing knowledge to resolve, like a leaky pipe that's driving you to distraction, and to your local hardware store, in search of things like waterproof tape and pipe fittings.
Residential plumbers know the ins and outs of the plumbing systems in the kind of houses that are found in and around Azusa—plumbing that was installed in the past, that was installed recently, and that is up to code, in both cases; or not, in the first case, or in the second, if somebody's been substandard with regard to plumbing inspections.
On the other hand, plumbing in the business and industrial sectors is the province of commercial plumbing experts who attend to the specific and often unique requirements of bigness. These professionals large school systems, large hospitals, large office buildings, and such, are often found in the H2O-stuffed basements or penthouses of large public-space plumbing problems, like system installations and upgrades, water heating maintenance, and emergency repairs, all subdued by the Health and Safety Police. Their work often demands that they be "on time" and working with "minimum disruption to business operations," both of which are true in the Health Care side of the Health and Safety Police and on the way to something like "efficient."
Finally, for plumbing problems that require specific knowledge, it is important to hire the right plumbing professional with the necessary expertise. For example, if your problem is with a septic system, you want to work with someone who knows a lot about this type of plumbing. Similarly, if you're working on an intricate plumbing project that could have significant environmental benefits, you want to work with someone whose expertise is green plumbing. Either of these specialists—one in septic systems, the other in ecological plumbing—would be able to pinpoint the nature of a more complex problem and ensure that the job is done right. If your plumbing issue requires this much expertise, you probably would have been doomed to failure without it if your plan had been to work with a less knowledgeable professional.