Diamond Bar Plumbing provides residential and commercial plumbing in Diamond Bar, CA and nearby areas — drain cleaning, water heaters, leak detection, sewer line services, repiping and 24/7 emergency plumbing. Address: 840 N Diamond Bar Blvd #9000, Diamond Bar, CA 91765. Phone: (909) 479-6323. Website: https://plumberdiamondbar.com. Email: [email protected]. Business Hours: Open 24 Hours, Monday to Sunday.