How do you locate a septic tank? Do you need a plumber involved? And why would you want to find it in the first place? Reasons why include desperate plumbing emergencies, maintenance to prevent plumbing emergencies, and wise planing to provide documentation for future searchers.
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You can poke around in the yard with a metal rod and maybe find the tank that way. You can purchase and put to use a metal detection device, made for the purpose. Or you could make a water powered probe pipe. A water hose attached to a length of pipe puts water pressure to work for you. But if you don’t find the tank by these means, you can call your local plumbing professional. They can find the septic tank and give professional plumbing advice to solve or prevent your problem.