159.9. The Community may require a person who discharges waste water or other substances into a purification works or a watercourse in contravention of a by-law adopted under section 159.7 to carry out, at the person’s own expense, the work required to clean or repair, as the case may be, the purification works or to eliminate from the watercourse any harmful or hazardous substances the person has unlawfully discharged into the watercourse, or to reimburse the Community for the costs incurred by it for such work.