How far back can a utility go to collect on a bill?

Question Details: The water reclamation district just sent my tenant a water shut-off notice for non-payment of bills going back 5 years. I called the district. They said they sent bills via email which I never received. If they got no response from email are they not in some way obligated to contact me in some other way so that a bill does not accumulate for 5 years. It is $718.60 they want or they will shut off the water. As I did not pay them because I didn't even know they existed for so many years does that not void an agreement of contract. Don't they have some legal obligation to find me before so much time has passed and so much money accumulated. What can I do?

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