Neptune Plumbing: The Home of 1-800-PLUMBING Service Division. Focusing on service, Neptune Plumbing knows that your plumbing systems are the heart of a home. When you need service, you want an experienced, reputable company that delivers on its promises. Since 1957, Neptune Plumbing has been providing Northeast Ohio with quality plumbing installation, repairs and service. Located in Cleveland, Ohio and serving the entire Northeast Ohio area, Neptune Plumbing understands how important plumbing needs are to owners and employs only the highest quality service technicians to complete jobs in your home or office.