Wastewater Collection and Treatment

GZA assists clients with the evaluation and design of onsite Subsurface/Sewage Treatment Systems (SSTS) including Large Subsurface/Sewage Treatment Systems (LSTS) for institutional and commercial wastewater collection and treatment. 

GZA has all the capabilities required for assessment and design of SSTS and LSTS including flow determination, subsurface characterization, soils evaluation/treatment, field testing and wetlands inventory, pathogen treatment, nitrogen treatment, and infiltration surface sizing.  GZA also provides specialized services including numerical 2- and 3-dimensional groundwater, vadose zone modeling, and modeling of nitrogen dilution and phosphorous attenuation.  GZA services range from siting, to preliminary design to final design and permitting to construction management.