Avoid The Scammers
There are to many services providers out there who are untrustworthy, unreliable, greedy, too expensive, and lack credentials and knowledge of and in their field.
Beware the company that predicates the word plumbing with some verbiage that makes them sound good
(We Are the Greatest Best Most Excellent A+ #1 Plumbing). Usually they are not.

90% of the time your front yard does not need to be dug up.
Flat rate pricing does not always have the clients best interest in mind.
Although equipment is expensive, it is usually more cost effective to replace something rather then repairing something that is reaching it's life expectancy. Experience, Knowledge, and Honesty are key.
Never accept low quality materials which are more than likely not code complaint and will not last.
100% of the time there is no such thing as quality services that are a cash only offer.
Always ask for a copy of the sewer and or drainage video inspection, and 
the Flux Capacitor on your water heater never needs to be replaced.