Accessing reliable water resistivity data often takes longer than the time required to use it. Therefore, as project budgets are broken down, a large portion of the cost is assigned to data acquisition and screening. This product was created to help reduce those project costs. A natural companion to GeoFluids, the Water Resistivity Atlas of Western Canada (Rw Atlas) maps Rw values from only those water analyses representative of formation waters, subdividing them into meaningful stratigraphic units. Stratigraphically indexed maps provide quick and easy access to individual water resistivity (Rw) values and the Atlas format allows for data comparisons in three dimensions. The statistical analysis included with each map layer adds clarity to regional trends seen on the maps. The Rw Atlas will direct users to reliable Rw values as well as provide a benchmark against which to compare and validate proprietary data. The Rw Atlas represents eight years of data capture and screening by RPCL. Sophisticated filtering techniques include chemical screening of the data in an attempt to identify and classify both formation waters and contaminated analyses.