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On-site septic systems are a source of local and regional groundwater contamination in the US and elsewhere. The New Jersey Pinelands area is characterized by sandy soil, underlain by a water-table aquifer. The Pinelands Commission, a regional land use planning and regulatory agency, allows the use of subsurface pressure dosing septic systems as an alternative to standard systems. The assumption that pressure dosing systems remove much of the wastewater nitrogen was tested, but no significant difference in nitrogen removal was found between system types.