Lake Hopatcong: Most Waters Now Free of Algae Bloom

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The New Jersey Department of Environmental Protection has lifted harmful algal bloom advisories for additional areas of Lake Hopatcong, bringing to 87 percent the total area of the lake no longer under water recreation advisory.

Nearly 90 Percent of Lake No Longer Under Algal Bloom Advisory

Lake Hopatcong: Most Waters Now Free of Algal BloomBased on data from water monitoring on Oct.3, the DEP has lifted the advisory at Mid-Lake, in the lower-central portion of the lake.  As of today, the advisory remains in effect only for the Prospect Point and Woodport areas in the northeastern portion of the lake.

Recreational users are reminded to avoid swimming or coming in contact with lake water in these twp remaining areas until monitoring demonstrates that cell counts fall below the Health Advisory Guidance level.

For more information on state DEP sampling and findins, please see  and

Harmful algal blooms are caused by bacteria that in many ways resemble and behave like algae. The causes of the Lake Hopatcong bloom this summer and fall are not fully understood. However, harmful algal blooms are generally fueled by nutrient-laden stormwater runoff followed by periods of hot weather that cause the proliferation of these bacteria, which are naturally present in waterbodies.

Under these conditions, blooms can reach levels that can be harmful to people and to pets coming in contact with the water. They typically subside with the onset of cooler weather.

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