Can I find a plumbing leak myself, or do I need a pro?

You can find a plumbing leak yourself using a bucket test and a pressure test, but fixing it usually requires a pro. Start with a bucket test to confirm the leak, then use a pressure test kit to isolate the leaking pipe. If the leak is above ground, you can fix it with PVC primer and cement; if underground, call a pro unless you’re comfortable trenching.