The answer to 'drain trap replacement frequency' is that drain traps should typically be replaced every 3-5 years, or sooner if they become cracked, corroded, or damaged. Drain traps are the curved pipe section under a sink or bathtub that helps prevent sewer gases from entering the home. Over time, the material can deteriorate, leading to leaks or blockages.
It's important to regularly inspect drain traps and replace them as needed to maintain proper plumbing function and prevent water damage. Replacing a drain trap is a relatively simple DIY project, but if you're not comfortable doing it yourself, it's best to hire a professional plumber to ensure it's done correctly.