Parts of Lake Hopatcong are safe for swimming again after the New Jersey Department of Environmental Protection issued a warning about a harmful algae bloom.

The DEP issued the warning at the end of June, warning people to avoid skin contact with the water in New Jersey’s largest lake. Officials now say that one section of the lake, known as Indian Harbor, can be reopened for swimming and water activities.

Officials say Lake Hopatcong visitors can still boat in the other areas of the lake, but they strongly suggest those visitors avoid contract with the water.

The algae can cause a variety of allergic reactions, such as skin irritation and gastrointestinal issues.

People should also avoid eating fish that are caught in the lake. Pets should not drink the water either.

Lake Hopatcong is not the only lake dealing with algae blooms. Six lakes around the state are still closed to swimming.

The DEP says that they are constantly monitoring the lakes and water quality. The status of each lake in New Jersey can be found on the department’s website.