@teralynn823
Hi 🙂
You obviously have more than enough water for the number of residential zones/citizens you have in that Region.
I'm wondering if under your roads tab when you click on traffic if you might have any roads that need upgrading between your water towers and residences?
Another possibility might be (since this is a fairly recent problem you've encountered), is if you have placed a new bridge somewhere. Some bridges have been kind of "buggy" in that services sometimes refuse to cross them.
Please post here again if you don't get the answer you need and if possible, maybe add another screenshot or two including where the services are located maybe?
Thanks so much and best of luck to you.