A chemical spill at Kwinana Beach, south of Perth, resulted in businesses in the area being evacuated by emergency services this morning.

Authorities were alerted after orange smoke was seen billowing from an industrial drum near Ocean Street about 7:00am.

The Department of Fire and Emergency Services (DFES) said the chemical was generally used as a fertiliser, and the side effects of exposure may include stinging eyes and throat.

Remote cameras were sent into the area to conduct surveillance for clean-up crews.

Twenty firefighters attended together with officers from the Department of Mines and Petroleum, the Department of Environment Regulation, police and St Johns Ambulance crews.

Nearby business were also warned they could be affected by fumes and people were advised to stay indoors.

DFES has advised there is no further threat and all roads have been reopened.