The answer to 'my plumbing repair smells bad' is that a foul odor coming from a recent plumbing repair is often caused by a problem with the drain or sewer system. This could be due to a blocked or clogged drain, a broken or damaged pipe, or a buildup of sewer gases. Symptoms may include a strong, unpleasant smell coming from the affected area, as well as slow or backed-up drainage.
In many cases, the cause of the odor can be addressed with a simple DIY fix, such as using a drain cleaner or plunger to clear a clogged pipe. However, if the problem persists or you suspect a more serious issue like a broken sewer line, it's best to call a professional plumber to diagnose and resolve the problem. They have the tools and expertise to identify the root cause and provide a long-term solution to eliminate the odor and prevent future problems.