Hi to all, Am a newbie here and have a problem that is baffling me. Am not in the business and I am just a retired homeowner with just average plumbing knowledge. My home is just shy of 2 1/2 years old. It is a 2,400 sq.ft. ranch built on slab. Am also on sewer. Is just my wife and I living here. Problem: Latest water bill shows excessive usage for this time of year. Normally around 4-5 CCF, Jumped to 11 CCF. Called water dept. They looked at usage and it showed strange things like high water usage at strange hours like from midnight to 4 or 5 a.m. and showing usage just about every hour of the day and night. They sent an employee out. We went around to toilets and checked for any running or leaks. Found none. After he left, I did dye test for 45 minutes on each toilet and found no leakage. No dripping faucets anywhere. All outside hose bibs were turned off early November as well as sprinkler system flushed and turned off at main control near water meter. Have walked yard and around exterior of house. No leaks anywhere outside. No leaks through slab. Have never heard any ghost flushings day or night or any water running when it shouldn't be. Checked PRV and it was set way too high at 95. Have no idea why the construction plumbers set it that high. Reduced it myself to just above 50 and noticed that the lock nut had never been secured and was just floating as well. Water tech had no explanation for problem. I asked about meter being defective. He said no and to his knowledge they had never had a defective one. They service at least 200 thousand residential customers and thousands of businesses. Have a hard time believing they've never had a defective meter. My question is this. Could the excessive usage be because of the high PRV pressure and how is that possible? The water has to be going somewhere and no leakage points have been found. I cannot get any hourly tracking info until tomorrow when water dept. reopens. This is driving me nuts and any help or feedback would be extremely welcomed. Thanks in advance to all.