Question: The company that Corexit is an indirect subsidiary of is headquartered in what city?

Context paragraphs:
British Columbia v Imperial Tobacco Canada Ltd: British Columbia v Imperial Tobacco Canada Ltd, [2005] 2 S.C.R. 473, 2005 SCC 49, is a decision of the Supreme Court of Canada where the Court found that the provincial "Tobacco Damages and Health Care Costs Recovery Act", which allowed the government to sue tobacco companies, was constitutionally valid.  Imperial Tobacco Canada is an indirect subsidiary of British American Tobacco.

Minnesota Pipe Line: The Minnesota Pipe Line (or MPL) is a crude oil pipeline that runs from Clearbrook, Minnesota southward to the Twin Cities.  Construction began in 2007 after the State of Minnesota approved the building permit, and ended in 2008; it is owned by Minnesota Pipe Line Company, LLC (MPL) and is operated by Koch Pipeline Company, a wholly owned, indirect subsidiary of Koch Industries.

Indiana Bell: Indiana Bell Telephone Company, Incorporated, is the Bell Operating Company serving Indiana.  It is an indirect subsidiary of AT&T Inc., owned by AT&T Teleholdings.

Sandpiper pipeline: The Sandpiper pipeline is a 616 mi underground oil pipeline project in the United States.  It would carry light crude oil from the Bakken oil fields in Northwest North Dakota, through Minnesota, to end in Superior, Wisconsin.  Enbridge Energy Partners, and Williston Basin Pipe Line LLC, an indirect subsidiary of Marathon Petroleum Corporation have been planning the project since 2013.  In 2015 Enbridge estimated the pipeline will cost about $2.6 billion.

KHBA-LD: KHBA-LD is a low-power television station in Spokane, Washington, broadcasting locally on UHF channel 39.  Founded June 1, 1992, the station is owned by He's Alive Broadcasting Association, an indirect subsidiary of the Upper Columbia Conference of Seventh-day Adventists, and broadcasts from a transmitter located atop Krell Ridge, southeast of Spokane.

Ecolab: Ecolab Inc., headquartered in St. Paul, Minnesota, is an American global provider of water, hygiene and energy technologies and services to the food, energy, healthcare, industrial and hospitality markets.  It was founded as Economics Laboratory in 1923 by Merritt J. Osborn, and renamed "Ecolab" in 1986.

Imperial Tobacco Company of Canada Ltd.: The Imperial Tobacco Company of Canada is a Canadian cigarette manufacturing company that is an indirect subsidiary of British American Tobacco.  Once known for marketing Sweet Caporals in Canada, Imperial Tobacco is now known for its du Maurier and Peter Jackson brands of cigarettes.

Corexit: Corexit (often styled COREXIT) is a product line of oil dispersants used during oil spill response operations.  It is produced by Nalco Company, associated with BP and Exxon and an indirect subsidiary of Ecolab.  Corexit was originally developed by the Standard Oil Company of New Jersey.  Corexit is typically applied by aerial spraying or spraying from ships directly onto an oil slick.  On contact with the dispersant, oil that would otherwise float on the surface of the water is emulsified into tiny droplets and sinks or (in the unusual case of sub-surface application) remains suspended in the water.  In theory this allows the oil to be more rapidly degraded by bacteria (bioremediation) and prevents it from accumulating on beaches and in marshes.

CRCC High-tech Equipment: CRCC High-tech Equipment Corporation Limited known also as CRCCE is a Chinese railway track maintenance machinery manufacturer.  It is a subsidiary of China Railway Construction Corporation Limited (CRCC), in turn an indirect subsidiary of the Chinese Central Government.

LaSalle Bank: LaSalle Bank Corporation was the holding company for LaSalle Bank N.A. and LaSalle Bank Midwest N.A. (formerly Standard Federal Bank).  With US$116 billion in assets, it was headquartered at 135 South LaSalle Street in Chicago, Illinois.  LaSalle Bank Corporation was formerly an indirect subsidiary of Netherlands-based ABN AMRO Bank N.V., one of the world's largest banks, with total assets of EUR 986 billion, more than 3,000 locations in over 60 countries and a staff of more than 105,000.  Bank of America acquired LaSalle Bank Corp. effective October 1, 2007, and officially adopted the Bank of America name on May 5, 2008.

Supporting paragraphs: Corexit Ecolab
Answer: St. Paul, Minnesota