Abstract: Testing water contamination around oil or gas wells. To determine a testing zone around an oil or gas well, multiple variables are received by data processing apparatus. The variables include variables associated with an oil or gas well, variables associated with an entity performing hydraulic fracturing in the oil or gas well, and variables associated with inhabitable regions surrounding the oil or gas well, to name a few. The multiple variables are processed by the data processing apparatus. In response to the processing, a zone around the oil or gas well within which to test for contamination due to the hydraulic fracturing in the oil or gas well is determined.

Abstract: One example of testing for water contamination in geographic areas to determine a risk of water contamination includes determining a risk of water contamination. A computer system receives identification of a geographic area in which a risk of water contamination is to be determined. In response, the system determines a number of potential complaints of water contamination in the geographic area by applying the number of one or more correlated sources of water contamination located in the geographic area. The system determines a risk factor representing a risk of water contamination in the geographic area based, in part, on the number of potential complaints. The system can provide the risk factor as the risk of water contamination in the geographic area.

Abstract: One example of testing for water contamination in geographic areas to determine a risk of water contamination includes determining a risk of water contamination. A computer system receives identification of a geographic area in which a risk of water contamination is to be determined. In response, the system determines a number of potential complaints of water contamination in the geographic area by applying the number of one or more correlated sources of water contamination located in the geographic area. The system determines a risk factor representing a risk of water contamination in the geographic area based, in part, on the number of potential complaints. The system can provide the risk factor as the risk of water contamination in the geographic area.