South Australia's Environment Protection Authority (EPA) is investigating whether traders have tipped oil down public drains in Adelaide's Chinatown district.
New pavers that are part of a $4 million redevelopment of Moonta Street have been stained by cooking oil, making them slippery and discoloured.
The issue was mentioned at an Adelaide City Council meeting last week.
Staff said nearby businesses had been disposing of their cooking waste in the public drains, with some oil spilling on the way and from empty barrels.
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