Research Article Nitrogen Treatment Efficiency of a Large Onsite Wastewater System in Relation to Water Table Dynamics Charles Pittman Humphrey Jr. 1 , Guy Iverson 2 , and Michael O’Driscoll 3 1 Environmental Health Sciences Program, East Carolina University, Greenville, NC, USA 2 Coastal Resources Management Program, East Carolina University, Greenville, NC, USA 3 Department of Geological Sciences, East Carolina University, Greenville, NC, USA Corresponding author: Dr. C. Pittman Humphrey Jr., Environmental Health Sciences, East Carolina University, 3408 Carol Belk, Greenville, NC 27858, USA Email: Humphreyc@ecu.edu This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as an ‘Accepted Article’, doi: [10.1002/clen.201700551] © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Received: 27 October 2017; Revised: 27 October 2017; Accepted: 3 November 2017