Thanks for your comments y'all, I traveled away from home after posting this so forgot to monitor it.

We do shower more than most people I think. We both shower twice a day, once in morning before work and once in evening after working out. But otherwise our water usage is fairly normal--we use a dishwasher once a night and wash clothes about 3 times a week.

Then again I did start creatine about a month ago so maybe I've been drinking more water than I thought...

Either way the water rates have been a real kick in the pants. Appreciate everyones perspective and will definitely do some testing to make sure there are no leaks.