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Calumet investigating reported sheen on the Missouri River in Great Falls

Calumet refinery in Great Falls
Calumet investigating sheen on Missouri River in Great Falls
Posted at 9:13 AM, Apr 20, 2023
and last updated 2023-04-24 10:35:39-04

(UPDATE) The sheen near the City of Great Falls wastewater treatment plant’s (WWTP) sanitary sewer outfall appears to no longer be present, according to a news release.

Initial tests indicate the WWTP is operating/functioning under normal conditions and that the source was exterior to and outside the control of the WWTP.

The investigation and sample collection/analysis are ongoing to determine any necessary corrective action.


(1st REPORT) Calumet Refining and City of Great Falls employees responded on Wednesday, April 19, to a reported sheen along the Missouri River.

The City of Great Falls said in a news release that absorbent materials and booms have been deployed as a precautionary measure.

Refinery employees and city staff are investigating and monitoring the Wastewater Treatment Plant's sanitary sewer outfall.

At this point, there is no word on the suspected cause of the sheen.


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