Water and gas chemistry data from: Mariner, R.H., Presser, T.S., Evans, W.C., 1977. Chemical, Isotopic, and Gas Compositions of Selected Thermal Springs in Arizona, New Mexico, and Utah: U.S. Geological Survey Open-File Report 77-654, 42 p., https://doi.org/10.3133/ofr77654. Water chemistry data was digitized for 31 samples. Reported attributes include: Sample name, Type, Reported location, Location description, State, County, Latitude, Longitude, Location resolution, Location error, Temperature, pH, Aluminum (Al), Boron (B), Bromine (Br), Calcium (Ca), Chloride (Cl), Cesium (Cs), Copper (Cu), Fluoride (F), Iron (Fe), Alkalinity as bicarbonate (HCO3), Mercury (Hg), Iodide (I), Potassium (K), Lithium (Li), Magnesium (Mg), Manganese (Mn), Sodium (Na), Ammonium (NH4), Nickel (Ni), Rubidium (Rb), Silica (SiO2), Sulfate (SO4), Zinc (Zn), Cations, Anions, Reported total dissolved solids, Salinity, Charge balance, Isotopic composition of hydrogen (Delta 2H), Isotopic composition of oxygen in water (Delta 18O H2O), Oxygen shift, Author comment, Digitizer comment. Gas chemistry data was digitized for 10 samples. Reported attributes include: Sample name, Type, Reported location, Location description, State, County, Latitude, Longitude, Location resolution, Location error, Total gas, Oxygen and argon (O2 + Ar), Methane (CH4), Carbon dioxide (CO2), Nitrogen (N2), Author comment, Digitizer comment. Data was digitized from Tables 1, 2, 3, 4, and 6. The following tables were not digitized: Table 5: States of reactions with respect to calcite, aragonite, chalcedony, alpha-cristobalite, and fluorite. Table 7: Estimated thermal aquifer temperatures. Table 8: Chemical potential for the formation of calcite from spring waters in Utah.