The legislative body of any city or borough may make, alter and repeal ordinances to regulate or prevent fishing, trespassing or any nuisance in or upon any property of such city or borough or of any subdivision thereof. Such ordinances may provide for the imposition of a fine of not more than two hundred fifty dollars for any violation thereof. The common council of any city or the warden and burgesses of any borough may appoint special constables to protect reservoir property and to execute any such ordinance and any provision of the statutes relating to protection of water supply, and for that purpose such constables shall have all the powers of constables of towns.