Water Quality Monitoring 

secchi2Water quality monitoring is essential to assess the overall health of Lake Hopatcong on a year to year basis, identifying long-term trends or changes in water quality, and quantifying and objectively assessing the success and potential impacts of restoration efforts. In-lake monitoring takes place during the growing season from May through September each year at eleven sampling stations on the lake.

The Lake Hopatcong Commission and its predecessor, the Lake Hopatcong Regional Planning Board, conducted regular water quality monitoring of the lake, going back to the 1980s.   Since 2001, this monitoring has been performed by Princeton Hydro, LLC. In 2013 and 2017, the Lake Hopatcong Foundation provided funding to continue the monitoring to prevent a gap in the monitoring data.


Princeton Hydro Water Quality PrEsentation

Lake Hopatcong Monitoring Locations Map

Assessment of the Effectiveness of Various Ways to Control Nuisance Aquatic Plants – Summary

2017 Water Quality Report Summary

2017 Water Quality Report

2017 Mid-Year Report

2016 Water Quality Report

2015 Water Quality Report

2014 Water Quality Report

2014 Mid-Year Report

2013 Water Quality Report

2013 Mid-Year Report

2012 Water Quality Report


2017 Lake Hopatcong Water Quality Monitoring

On Monday, November 13th, Dr. Fred Lubnow of Princeton Hydro will present the 2017 Lake Hopatcong water quality monitoring results at the Lake Hopatcong Commission meeting.  The open public meeting begins at 7pm at the Mount Arlington Civic Center, 7 Fern Road. The Lake Hopatcong Foundation and the Lake Hopatcong Commission provided joint funding for the water quality monitoring …

Read More


Effectiveness of Control Methods for Nuisance Aquatic Plants

The Lake Hopatcong Foundation retained the services Princeton Hydro during the spring and summer 2017 to conduct a study to determine the relative effectiveness of various techniques to reduce nuisance densities of submerged aquatic vegetation (SAV). The three plant reduction techniques included: herbicide applications, herbicide application followed by harvesting and hydroraking.  The LHF also retained the …

Read More