Groundwater Modeler

Larry Walker Associates Incorporated•Ventura, CA

9d•$90,000 - $125,000•Hybrid

About The Position

Larry Walker Associates is seeking a Groundwater Modeler to support numerical modeling and technical analysis on groundwater projects throughout California. This role is suited to candidates with more than 4 years of professional experience who are passionate about groundwater modeling and want to apply their expertise across a range of complex projects. The successful candidate will work with teams to develop and apply groundwater models in support of SGMA compliance, basin characterization, water resources planning, and regulatory reporting.

Requirements

Bachelor’s degree or higher in Geology, Hydrologic Sciences, Civil/Environmental Engineering, or a closely related field
Demonstrated hands-on experience with MODFLOW-based numerical groundwater modeling (e.g., MODFLOW-6, MODFLOW-OWHM, MODFLOW-USG, MODFLOW-NWT) or equivalent
4 years of professional experience in hydrogeology, or water resources engineering
Proficiency in Python or R for scripting, data processing, and model pre/post-processing
Strong technical writing skills with the ability to document model construction, calibration, and results clearly for both technical and regulatory audiences
Willingness to travel as needed

Nice To Haves

Experience with IWFM, C2VSim, or other integrated surface water–groundwater modeling frameworks used by DWR
Familiarity with California water data systems (DWR, GAMA, CIMIS, OpenET, DDW, CEDEN) for model input development and data validation
Professional registration (e.g., PG, CHG, PE) in California is highly desired
Excellent work ethic, self-directed, and highly motivated
Valid driver's license

Responsibilities

Develop, calibrate, and apply numerical groundwater flow and transport models using MODFLOW (e.g., MODFLOW-6, MODFLOW-OWHM, MODFLOW-USG) and/or DWR integrated hydrologic models (IWFM, C2VSim)
Perform model parameter estimation and uncertainty analysis
Develop and evaluate model input datasets including hydrostratigraphy, recharge, pumping, and water quality using R or Python, specialized software, and GIS
Conduct scenario analyses to evaluate groundwater management strategies, pumping impacts, and recharge effectiveness
Use model outputs to support basin management, facilitate stakeholder engagement, and meet regulatory requirements
Prepare clear and well-documented technical reports, model documentation, and presentations

Benefits

competitive salary
annual bonus program
fully funded profit-sharing retirement program
medical
dental
vision
life insurance
long-time disability insurance
flexible paid vacation time
paid sick leave
10 paid holidays a year
annual training budget which includes conference attendance and support to obtain professional licensure