Tracking NJ water quality over the decades

Map showing locations where 30-40 years' worth of water samples were analyzed to highlight water quality trends in USGS Scientific Investigations Report 2016-5176, Trends in the Quality of Water in New Jersey Streams, Water Years 1971-2011. The map is a figure in the report, minus station numbers. The report url is https://pubs.er.usgs.gov/publication/sir20165176.