Water Quality Trends in Nutrients in New Jersey Streams, Water Years 1971-2016
Date
2020-04-21
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Publisher
Trenton, N.J. : Department of Environmental Protection and Energy, Division of Science and Research
Abstract
The New Jersey Department of Environmental Protection’s (NJDEP’s) Division of Science and Research (DSR) and Bureau of Freshwater & Biological Monitoring (BFBM) collaborated on this study to update a previous report by the United States Geological Survey (USGS) on the trends of water quality parameters measured at stations on streams in New Jersey from water years 1971-2011. This report updates the trends valuated for nutrients with five years of additional data (2012-2016). Trend tests were performed on nitrate plus nitrite as nitrogen, total nitrogen, and total phosphorus at 28 water quality stations. Although the previous report also performed trend analyses on 28 stations, four stations differ between the original report and
this update. In this report, water quality trends were assessed at four new stations and four other stations were not assessed because they have been discontinued. Two different statistical
methods were utilized to identify trends: Weighted Regressions on Time, Discharge, and Season (WRTDS) and Seasonal Kendall (SK) tests.
Description
Keywords
New Jersey, Water quality - New Jersey - Measurement, Stream measurements - New Jersey, Nutrient pollution of water