The lake is drained by the Tobyhanna Creek, which flows northwest into the Lehigh River.

It shares its name with an adjacent village, which has a Zip Code of 18624.

The Lake Harmony Group has the responsibility to preserve, control, and maintain the environmental integrity and recreational use of Lake Harmony.

Among other things, LHG is responsible for rules and regulations for the safe commercial and non-commercial use of the lake and the paper streets, storm water management, maintenance of the lake and paper streets, lake water quality, ownership and placement of navigational buoys, and licensing of boat slips.

[3] A major project undertaken by the LHG is the installation in the lake of a Clean Flo system of aerators, which has had a demonstrated success in increasing lake water levels and improving ecosystem health.