Some common plumbing reasons for an increase in your water bill could be due running toilets, leaky kitchen or bathroom faucets, or outside irrigation, and slab leaks. For more severe situations in which you might see a high water bill could be a burst pipe under concrete, pool filler line breaks, water mainline leaks, or water softeners not programmed right could be utilizing more water than needed. As always, be mindful and monitor your water usage; use full laundry loads, watering plants and grass, lengthy shower/bath times, keeping water running for dishes, teeth, and using the dishwasher.