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How much it will cost to install an earthquake shut-off valve depends on who’s doing the installation. The price of the earthquake shut-off valve itself can cost between $250 and $750, and you’ll pay between $150 and $200 for labor if you hire a licensed plumbing contractor. If you install the valve yourself, you’ll save on labor, but you might need to spend $50 to $300 on the right tools for the job (and it’s a complex job that we don’t recommend DIYing).

An underground water leak will most likely show signs of water damage in the basement. If you have a concrete foundation, look for frizzle lines and discoloration on the walls. Sometimes, you may be able to feel the moisture with direct touch. Also, if your basement smells musty or moldy, you might have an underground water leak that’s causing mold to form.

A journeyman plumber is a licensed plumber with a state-issued permit who installs and repairs piping for water and heating systems under the supervision of a master plumber. Also known as a plumbing contractor, a master plumber is considered the highest level in this profession. In addition to passing all state-level requirements, master plumbers have several years of experience. They are allowed to lead teams, create blueprints, and design and install plumbing systems.

The regulations around whether drain pipe installers need to hold licenses or certifications differ based on where you live and the type of drain pipe installed. Municipalities have varying rules and regulations about who can and can’t perform plumbing work. However, we recommend hiring a certified plumber to install or modify your drain lines. Licensed plumbers will perform a high-quality, professional installation, which translates to a lower risk of clogs and leaks in the future. Use Angi’s state licensing tool to confirm the license status of your potential plumber before hiring them to install your drain pipe.