Albury Council is investigating afte a large amount of black paint was poured down a storm water drain in North Albury on Monday.
"The paint emerged in the channel that runs through the off-leash dog park in Logan Road, although it caused significant discolouration, the contamination did not spread into any natural watercourse," council said.
"Pouring any contaminant into any drain is strictly prohibited as it can harm people, animals, watercourses and infrastructure.
IN OTHER NEWS:
"Paint, oils and other dangerous substances can be safely disposed of at the Albury Waste Management Centre. Disposal of paint and oils is free."
The source of the paint has been identified and penalties of up to $4000 for individuals and $8000 for corporations may apply.
Anyone with information about people deliberately polluting Albury's drains and pipes is asked to contact council on 6023 8111.