85% of water utilities are owned or controlled by municipalities and fall under the public works departments. PVC pipe is a major asset they manage. PVC pipe was introduced in North America in 1951, using a tin stabilizer and as a corrosion-proof piping solution and was commercially introduced into the U.S. public works market in the early 1960’s. Corrosion resistant, easy to install, low break rates, and cost competitive to existing water, sewer, and irrigation piping products, PVC pipe was quickly adopted by many communities. Today, over 40,000 North American water utilities use PVC pipe, and more than one million miles are in service – or about 78% of all new drinking water distribution pipes installed on the continent and these utilities are developing asset management plans and updating accounting’s pipe service life and asking “How long are these pipes going to last?” The initial design standards for PVC were based on the results of long term, steady state pressure regression tests and if the pipe did not experience significant cyclic pressure amplitudes, this design approach worked and is the basis for PVC pipe pressure ratings today (AWWA C900 and C905). Researchers discovered that PVC pipe had two distinct lives, one based on steady state conditions and the other based on cyclic (fatigue) conditions where frequent opening and closing of valves created transient conditions. Laboratory tests confirm that the fatigue mode of failure remains a possibility and the procedures for computing the number of cycles to failure for a given stress history has been well documented in literature. However, these studies were mostly developed based on lab test results, mostly driven by a single transient source. Fatigue analysis by using field monitoring data from pressure sensors under actual operating conditions are more accurate, yet complex. This presentation reviews a new methodology with real in-field examples of determining the RUL of PVC water pipes in service.