Arsenic in sediments, groundwater, and streamwater of a glauconitic Coastal Plain terrain, New Jersey, USA-Chemical “fingerprints” for geogenic and anthropogenic sources

► Arsenic inputs to a Coastal Plain stream are mainly geogenic. ► Arsenic inputs from orchard pesticide residues were not clearly identified. ► The arsenic load in the stream is mainly particulate arsenic. ► Arsenic in groundwater discharge to the stream contributes to the arsenic load. ► Arsenic is released from minerals beneath the streambed by microbial activity.