A toilet that won’t stop running or constantly clogs is more than just an annoyance—it can waste hundreds of gallons of water, drive up your utility bills, and signal hidden plumbing issues. Homeowners often ask the same two questions about their toilets - " Why does my toilet keep running?" and " Why does it keep clogging?" Let’s break down the most common causes, when you can attempt a quick DIY fix, and when it’s smarter to call in a professional plumber.