Tenant who is not paying water bill

[Karen Sanderson]

Hi all, per the rental lease, tenant is responsible for all utilities except trash. I receive a courtesy copy of the water bill each month. The renters have NOT paid a water bill since they have moved in (9 months ago). I have mentioned it 2x and was told ... yes will will catch it up... waiting for refund, new job , etc. Well now the bill is almost $500 and I would like to send a certified letter to the tenants. I, of course, will reference the rental agreement. Anyone have any language I can add? I would prefer that we not start eviction proceedings... however, I will go that route if necessary. 

I would imagine the water company will look to me to pay it if they move out and do not do so.

Any advise? 

Thanks , 

Karen