The National Energy Board says about 10,000 litres of light crude oil spilled Monday at a storage site east of Edmonton.
Enbridge said that as of Tuesday morning, it had recovered almost all of the oil, which had leaked from a tank valve in an industrial area of Strathcona County.
The company said the oil flowed into a drainage ditch and then into a creek.
The Transportation Safety Board dispatched a team to the spill site, marking the second time one has been sent to investigate a pipeline-related incident this year.
Last month, Enbridge said a third-party strike on its pipeline caused about 961,000 litres of light oil condensate to leak into a construction pit.
The TSB has launched a full investigation into the February spill.Report Typo/Error