No, a pond consisting of a hole in the ground lined with pond liner does not require a permit. Such an ornamental pond is not considered a structure and therefore does not require a permit. Of course, the pond must be built on your own property - your own yard - at a home. However, depending on how big you make the pond or what construction technique you use, an environmental permit may be required. Think about excavators or other machinery that will interfere through the public space near the home during construction. Check with your municipality for this.