Skip to main content
Email this page. Print this page set small font size. set medium font size. set large font size

News & Information

Please select a year.

Lake Hopatcong Update

Release Date: October 29, 2019


As of 10/25, the Lake Hopatcong advisory has been lifted in the Prospect Point and Wood Port Bay area in the northeastern portion of the lake.

Additional sampling was conducted outside of the Prospect Point and Wood Port Bay areas due to observations of localized suspected HABs. Results for 3 locations showed cell counts greater than the health advisory guidance level. As such, localized advisories continue to be recommended for the shoreline at Byram Cove, and now for Pine Tree Point and north of Bertrand Island (ST-20). DEP will continue to investigate any new reports of HABs on Lake Hopatcong and will resample the remaining localized HABs on an as needed basis.


Based on data from the monitoring on 10/3, the DEP has lifted the advisory at Mid-Lake, in the lower-central portion of the lake. At this time, approximately 87% of the waters of the lake have had the advisory lifted. Field Sampling Results.


The Department of Environmental Protection today lifted harmful algal bloom advisories for additional areas of Lake Hopatcong, bringing to about 60 percent the total area of the lake no longer under advisory. September 20 press release.


The DEP's advisory remains in effect for all areas of the lake except Indian Harbor, Henderson Cove, Byram Cove, Byrum Bay to Halsey Island, and, as of 9/6, the area surrounding ST-14 (S.E. of State Park beach) in the southern part of the lake. Sampling results updated 9/18/2019.


DEP Lifts Harmful Algal Bloom Advisory for Six Beaches on Lake Hopatcong in Area from Byram Bay to Halsey Island Advisory Update.


The Department of Environmental Protection's advisory about bodily contact with lake water has been lifted in the Indian Harbor area of Lake Hopatcong. Advisory Update.


The New Jersey Communicable Disease Service (CDS) recently launched a waterborne illness web page where information related to HAB illness is provided. You can find the website here: external link


High-Tech Buoys Deployed as Part of Multifaceted Response to Lake Hopatcong Harmful Algal Bloom as Swimming and Contact Advisory Remains in Effect

(19/P057) TRENTON –The Department of Environmental Protection and U.S. Geological Survey this week deployed high-tech real-time monitoring buoys as part of a comprehensive response to the widespread Harmful Algal Bloom, or HAB, affecting northern New Jersey's Lake Hopatcong. There is no scientifically sound treatment to eliminate HABs from water bodies, so advanced and continuous monitoring is the key element in protecting health and assessing when the lake is safe for recreation.

Full DEP News Release
Full DEP News Release as downloadable PDF
NJ DEP real-time monitoring data
USGS real-time data
NJ DEP Harmful Algae Blooms (HAB) Website

FAQ (Frequently Asked Questions)