(Portland, OR) -- The Portland Bureau of Environmental Services says it's found the source of material that was turning Fanno Creek white. Residents started reporting the discolored water prior to Labor Day near the pedestrian bridge at Southwest Bertha Boulevard. City crews determined the source of the problem was a pollution remediation project at a dry cleaner on Capitol Highway. They were using a material called BAC-9, which is a non-toxic material that's used to clean certain pollutants underground. City code prevents any discharge into storm drains. Once the company was notified, they stopped. The city is investigating and there could be an enforcement action.