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Environmental Water Resource Consultant

The Columbia Basin Groundwater Management Area SSP&A is assisting a grass-roots organization in developing water resource tools to support assessment of water management alternatives within the 8,000 square mile Columbia River Basalt Group aquifer.
Hyde Park Landfill Groundwater Model SSP&A  developed a model of groundwater flow in the fractured rock where over 20,000 tons of chlorinated DNAPLs were released.
Hanford Nuclear Reservation Remediation Modeling SSP&A is part of a multi-firm team developing remedial alternatives and strategies for the RI/FS and post Record of Decision (ROD) activities. 
Piceance Basin, Colorado SSP&A has conducted several field sampling programs, groundwater and gas geochemistry evaluations, and water resource studies related to the develpment of oil and natural gas resources in western Colorado, in addition to other states.
Long Island, New York MTBE Groundwater Modeling SSP&A developed groundwater models to evaluate the migration and remediation of more than 30 large plumes dominated by MtBE (Methyl tertiary-butyl ether) on Long Island, New York.
San Francisco Bay Since 1984, SSP&A has directed the investigation and remediation of the 1990 Bay Road site in East Palo Alto, California.

Our Expertise

S.S. Papadopulos & Associates, Inc.
was established in 1979 to provide
professional groundwater
and hydrogeology consulting services.
With that cornerstone of expertise, we
have continued to grow and have
developed an internationally recognized
practice in contaminant studies,
environmental engineering,
remediation, geochemistry, and
surface-water hydrology
. Learn More


SSP&A has developed modeling and related software for over 20 years. SSP&A develops and distributes software for groundwater modeling and related analysis. Learn More


Dr. Erica DiFilippo Joined the Interstate Technology and Regulatory Council’s (ITRC) PFAS Team – The goal for the project team is to produce concise technical resources to help regulators and other stakeholders improve their understanding of the current science regarding per-and polyfluoroalky
SSP&A is a Proud Sponsor of the 2018 Darcy Lecture Series – The Darcy Lecture Series was established in 1986 by the National Groundwater Association (NGWA) and promotes outstanding achievements in the field of groundwater hydrogeology.
SSP&A is Pleased to Announce the Following Promotions in 2018: – Promoted to Associate for three SSP&A senior staff members:  
Farvolden Award - 2017 – S.S. Papadopulos & Associates, Inc. began supporting the Robert Farvolden Awards in 2011. We awarded 4 scholarships to students for their presentations or posters given at the 2017 National Ground Water Association Summit.
Upcoming Training Course: Calibration and Uncertainty Analysis for Environmental Models – October 8-11, 2018.  Instructed by Dr. John Doherty, author of PEST.  
Dr. Erica DiFilippo Reelected to NGWA Board – Erica DiFilippo, Ph.D.
Illinois Office is Now Open – We are pleased to announce the opening of a new office location in Illinois.
MODFLOW and More 2017 – May 21-24, 2017 at the Colorado School of Mines, Golden, CO
Software Release: MT3D-USGS – MT3D-USGS, an updated release of MT3DMS and product of collaboration between the US Geological Survey (USGS) and S.S. Papadopulos and Associates, Inc. (SSP&A) is now available for download.
Software Release: mod-PATH3DU – S.S. Papadopulos & Associates, Inc., in collaboration with the University of Waterloo, is pleased to announce the release of mod-PATH3DU v.1.1.0, a particle path and travel-time simulator for structured and unstructured grids. This latest release includes the Waterloo method – the most powerful particle tracking algorithm available for MODFLOW and MODFLOW-USG.

US Locations

International Locations