Mark has performed a number of plumbing services on our 40 year old house over the last year (has replaced three sinks, replaced six faucets, replaced a hot water tank, replaced a toilet and replaced a shower head). Mark is very friendly, punctual, service oriented and charges reasonable rates. You can tell he is an experienced and knowledgeable plumber. Mark's top priority is customer service and providing a quality plumbing product. 9 stars instead of 10 because sometimes the finishing details can be a little off (I am very picky). I would recommend Mark / Blue Frog Services for any plumbing needs.