Bay Area Drainage is a diamond-certifed and certified contractor with 34 years experience. The company serves customers in Contra Costa County, Alameda County and additional areas. The company prides itself on expert workmanship. New construction or retrofit, home or commercial, we build the finest drainage systems. Here what one of our customers said: Recently I had a retaining wall replaced by Bay Area Drainage - I was very impressed by the company and their work. The price was very reasonable and the workmen were the nicest I have ever met. They were very polite and when the job was completed the area was left very neat and clean. I would not hesitate to recommend Bay Area Drainage very highly to anybody .' Contact us today to receive a complimentary quote.