Matthew Landon


Selected Publications (arranged chronologically by type):

Journal Articles

Barry, P.H., Kulongoski, J.T., Landon, M.K., Tyne, R.L., Gillespie, J.M., Stephens, M.J.,  Hillegonds, D.J., Byrne, D.J., and Ballentine, C.J., 2018, Tracking enhanced oil recovery signatures in casing gases from the Lost Hills oil field using noble gases. Earth and Planetary Science Letters, 496, 57-67.

Kulongoski, J.T., McMahon, P.B., Land, M.T., Wright, M.T., Johnson, T.A., and Landon, M.K., 2018, Origin of methane and sources of high concentrations in Los Angeles groundwater, Journal of Geophysical Research: Biogeosciences. 123.

McMahon, P.B., Kulongoski, J.T., Vengosh, A., Cozzarelli, I.M., Landon, M.K., Kharaka, Y.K., Gillespie, J.M., and Davis, T.A., 2018. Regional patterns in the geochemistry of oil-field water, southern San Joaquin Valley, California, USA.  Applied Geochemistry,

Kent, R.K., and Landon, M.K., 2016, Triennial changes in groundwater quality in aquifers used for public supply in California: utility as indicators of temporal trends. Environmental Monitoring and Assessment, 188: 610, DOI: 10.1007/s10661-016-5618-3.

Green, C.T., Zhang, Y., Jurgens, B.C., Starn, J.J., and Landon, M.K., 2014, Accuracy of travel time distribution (TTD) models as affected by TTD complexity, observation errors, and model and tracer selection, Water Resources Research, DOI: 10.1002/2014WR015625.

Landon, M.K., Burton, C.A., Davis, T.A., Johnson, T.D., and Belitz, K., 2013, Statistical evaluation of variables affecting occurrence of hydrocarbons in aquifers used for public supply, California, Journal of the American Water Resources Association, 50(1), 179-195. DOI: 10.1111/jawr.12129

Kent, R.H, and Landon, M.K., 2013, Trends in concentrations of nitrate and total dissolved solids in public supply wells of the Bunker Hill and Rialto-Colton groundwater subbasins, San Bernadino County, California: Influence of legacy land use, Science of the Total Environment, v. 452-453, 125-136.

Landon, M.K., and Belitz, K., 2012, Geogenic sources of benzene in aquifers used for public supply, California: Environmental Science and Technology, 46, 8689-8697.

Landon, M.K., Green, C.T., Belitz, K., Singleton, M.J., and Esser, B.K., 2011, Relations of hydrogeologic factors, groundwater reduction-oxidation conditions, and temporal and spatial distributions of nitrate, Central-Eastside San Joaquin Valley, California: Hydrogeology Journal, 19: 1203-1224.

Johnson, R.L., Clark, B.R., Landon, M.K., Kauffman, L.J., and Eberts, S.M., 2011, Modeling the potential impact of seasonal and inactive multi-aquifer wells on contaminant movement to public water-supply wells: Journal of the American Water Resources Association, 47(3), 588-596.  

Belitz, K., Jurgens, B., Landon, M., Fram, M., and Johnson, T., 2010, Estimation of aquifer scale proportion using equal area grids: Assessment of regional scale groundwater quality: Water Resources Research, 46, W11550.

Landon, M., Jurgens, B., Katz, B., Eberts, S.M., Burow, K., and Crandall, C., 2010, Depth-dependent sampling to identify short-circuit pathways to public-supply wells in multiple aquifer settings in the United States: Hydrogeology. Journal, 18(3), 577-593.

Jurgens, B.C., Fram, M.S., Belitz, K., Burow, K.R., and Landon, M.K., 2010, Effects of Groundwater Development on Uranium: Central Valley, California, USA: Ground Water, 48, 913-928.

McMahon, P.B., Böhlke, J.K., Kauffman, L.J., Kipp, K.L., Landon, M.K., CrandallC.A., Burow, K.R., and BrownC.J., 2008, Source and Transport Controls on the Movement of Nitrate to Public Supply Wells in Selected Principal Aquifers of the United States: Water Resources Research, 44, W04401.

Plummer, L.N., Busenberg E., Eberts, S.M., Bexfield, L.M., Brown, C.J., Fahlquist, L.S., Katz, B.G., and Landon, M.K., 2008, Low-Level Detections of Halogenated Volatile Organic Compounds in Groundwater: Use in Vulnerability Assessments: Journal of Hyd. Eng., 13(11), 1049-1068.

Böhlke, J.K., Wanty, R., Tuttle, M., Delin, G., and Landon, M., 2002, Denitrification in the recharge area and discharge area of a transient agricultural nitrate plume in a glacial outwash sand aquifer, Minnesota: Water Resources Research, 38 (7), 10.1029/2001WR000663 (200238).

Capel, P.D., Kruglov, V., Landon, M.K., Delin, G.N., and Certain, H.J., 2002, Variations in concentrations of atrazine and nitrate during well purging in relation to field water-quality parameters: Hydrological Science and Technology, 18(1-4), 217-230.

Delin, G.N. and Landon, M.K., 2002a, Effects of surface run-on on the transport of agricultural chemicals to ground water in a sandplain setting: The Science of the Total Environment, 295, 143-155.

Delin, G.N. and Landon, M.K., 2002b, Effects of topography on the transport of agricultural chemicals to groundwater in a sand-plain setting: Hydrogeology Journal, 10, 443-454.

Landon, M.K., Rus, D.L., and Harvey, F.E., 2001, Comparison of instream methods for measuring hydraulic conductivity in sandy streambeds: Ground Water, 39(6), 870-885.

Landon, M.K., Delin, G.N., Komor, S.C., and Regan, C.R., 2000, Relation of pathways and transit times of recharge water to nitrate concentrations using stable isotopes: Ground Water, 38(3), 381-395.

Delin, G.N., Healy, R.W., Landon, M.K., and Böhlke, J.K., 2000, Effects of topography and soil properties on recharge at two sites in an agricultural field: Journal of the American Water Resources Association, 36(6), 1401-1416.

Landon, M.K., Delin, G.N., Komor, S.C., and Regan, C.R., 1999, Comparison of the stable-isotopic composition of soil water collected from suction lysimeters, wick samplers, and cores in a sandy unsaturated zone: Journal of Hydrology, 224, 45-54.

Delin, G.N., and Landon, M.K., 1996, Multiport well design for sampling of ground water at closely-spaced vertical intervals, Ground Water, 34(6), 1098-1104.


USGS and Other Reports

Davis, T.A., Landon, M.K., and Bennett, G.L., 2018, Prioritization of oil and gas fields for regional groundwater monitoring based on a preliminary assessment of petroleum resource development and proximity to California’s groundwater resources: U.S. Geological Survey Scientific Investigations Report 2018–5065, 115 p.,

Metzger, L.F., and Landon, M.K., 2018, Preliminary groundwater salinity mapping near selected oil fields using historical water-sample data, central and southern California: U.S. Geological Survey Scientific Investigations Report 2018–5082, 54 p.,

McMahon, P.B., Kulongoski, J.T., Wright, M.T., Land, M.T., Landon, M.K., Cozzarelli, I.M., Vengosh, Avner, and Aiken, G.R., 2016, Preliminary results from exploratory sampling of wells for the California oil, gas, and groundwater program, 2014–15: U.S. Geological Survey Open-File Report 2016–1100, 8 p.,

Dillon, D.B., Davis, T.A., Landon, M.K., Land, M.T., Wright, M.T., and Kulongoski, J.T., 2016, Data from exploratory sampling of groundwater in selected oil and gas areas of coastal Los Angeles County and Kern and Kings Counties in southern San Joaquin Valley, 2014–15: California Oil, Gas, and Groundwater Project: U.S. Geological Survey Open-File Report 2016–1181,

Landon, M.K., Morita, A.Y., Nawikas, J.M., Christensen, A.H., Faunt, C.C., and Langenheim, V.E., 2015, Aquifer geometry, lithology, and water levels in the Anza–Terwilliger Area—2013, Riverside and San Diego Counties, California: U.S. Geological Survey Scientific Investigations Report 2015–5131, 30 p.

Metzger, L.F., Landon, M.K., House, S.F., and Olsen, L.D., 2015, Mapping selected trace elements and major ions, 2000-2012, Mojave River and Morongo Groundwater Basins, Southwestern Mojave Desert, San Bernardino County, California: U.S. Geological Survey Data Set,, doi:10.5066/F7Q23X95.

Ponti, D.J., Wagner, B.J., Land, M.T., and Landon, M.K., 2014, Characterization of potential transport  pathways and implications for groundwater management near an anticline in the Central Basin area, Los Angeles County, California: U.S. Geological Survey Open-File Report 2014-1087, 75 p. and appendix,

Chapelle, F.H., Campbell, B.G., Widdowson, M.A., and Landon, M.K., 2013, Modeling the long-term fate of agricultural nitrate in groundwater in the San Joaquin Valley, California. In: Current Perspectives in Contaminant Hydrology and Water Resources Sustainability, Dr. Paul Bradley (Ed.), ISBN: 978-953-51-1046-0, InTech,  Available from:

Mathany, T., Landon, M.K., Shelton, J., and Belitz, K., 2013, Ground-Water Quality Data in the Western San Joaquin Basin 2010: Results from the California GAMA Program: U.S. Geological Survey Data Series 706.

Landon, M.K., 2011a, Preliminary compilation and review of current information on groundwater monitoring and resources in the Lower Mekong River Basin, 2011. Mekong River Commission, Phnom Penh, Cambodia, August 18, 2011, 34 p.

Landon, M.K., 2011b, Preliminary Action Plan for Groundwater Monitoring in the Lower Mekong River Basin by the Mekong River Commission, 2011. Mekong River Commission, Phnom Penh, Cambodia, August 18, 2011, 61 p.

Landon, M.K., Belitz, K., Jurgens, B.C., Kulongowski, J.T., and Johnson, T.D., 2010, Status and understanding of groundwater quality in the Central-Eastside San Joaquin Basin, 2006: California GAMA Program Priority Basin Project: USGS SIR 2009-5266.

Belitz, K., and Landon, M.K., 2010, Groundwater quality in the Central Eastside San Joaquin Valley, California: USGS Fact Sheet 2010-3001.

Landon, M.K., Rus, D.L., Dietsch, B.J., Johnson, M.R., and Eggemeyer, K.D., 2009, Evapotranspiration rates of riparian forests, Platte River, Nebraska, 2002-06: USGS SIR 2008-5228.

Landon, M.K., and Belitz, K., 2008, Ground-Water Quality Data in the Central Eastside San Joaquin Basin 2006: Results from the California GAMA Program: USGS DSR 325.

Clark, B.R., Landon, M.K., Kauffman, L.J., and Hornberger, G.Z., 2008, Simulations of ground-water flow, transport, age, and particle tracking near York, Nebraska for a study of transport of anthropogenic and natural contaminants (TANC) to public supply wells: USGS SIR 2007-5068.

Landon, M.K., Clark, B.R., McMahon, P.B., McGuire, V.L., and Turco, M.J., 2008, Hydrogeology, chemical characteristics, and transport processes in the zone of contribution of a public-supply well in York, Nebraska: USGS SIR 2008-5050.

Landon, M.K., and Turco, M.J., 2007, Hydrogeologic Setting and Ground-water Flow Simulation of the Eastern High Plains Regional Study Area, Nebraska: In, USGS Prof. Pap. 1737-A.

Stanton, J.S., Landon, M.K., and Turco, M.J., 2007, Ground-water age and quality in the High Plains Aquifer near Seward, Nebraska, 2003-04: USGS SIR 2007-5088.

Landon, M.K., 2002, Preliminary description of a model of ground-water flow and ground-water/surface-water interaction for predevelopment, 1941-50, and 1950-97 development conditions in part of the Republican River Basin, Nebraska, Kansas, and Colorado: USGS OFR 02-175.

Landon, M.K. and Cornwall, J.F., 2002, Preliminary code, input, and output for the Deep Percolation and Irrigation Requirement Model (DPIRM) for simulating rates of ground-water recharge and pumpage for irrigation in part of the Republican River Basin, Nebraska, Kansas, and Colorado: USGS OFR 02-242.

Landon, M.K. and McGuire, V.L., 2002, Preliminary data from analysis of base-flow separation in part of the Republican River Basin, Nebraska, Kansas, and Colorado: USGS OFR 02-240.

Lindgren, R.J. and Landon, M.K., 2000, Effects of ground-water withdrawals on the Rock River and associated valley aquifer, Eastern Rock County, Minnesota: USGS WRIR 99-4157.

Landon, M.K., Delin, G.N., Lamb, J.A., Anderson, J.L., and Dowdy, R.H., 1998, Effects of farming systems on ground-water quality at the Management Systems Evaluation Area near Princeton, Minnesota, 1991-95: USGS WRIR 98-4128.

Landon, M.K. and Hult, M.F., 1996, Source mass balance calculated from changes in composition of spilled crude oil in the subsurface near Bemidji, Minnesota: in Morganwalp, D.W., and Aronson, D.A., eds., USGS Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, Sept. 20-24, 1993: USGS WRIR 94-4015, 631-640.

Landon, M.K., and Delin, G.N., 1995, Ground-water quality in agricultural areas, Anoka Sand Plain Aquifer, East-Central Minnesota, 1984-90: USGS WRIR 95-4024.

Delin, G.N., Landon, M.K., Lamb, J.A., and Anderson, J.L., 1994, Characterization of the hydrogeology and geochemistry at the Management Systems Evaluation Area (MSEA) near Princeton, Minnesota: USGS WRIR 94-4149