Question: Millstream Brewing was founded in what county?

Context paragraphs:
Gunther Brewing Company: Gunther Brewing Company is a historic brewery building located at Baltimore, Maryland, United States.  The site comprises 15 masonry buildings.  The main structure is a five-story brick "L"-shaped Romanesque Revival-style brew house with a two-story brick ice plant built about 1910 and one- and two-story boiler room.  Additional brew houses built in 1936 and 1950 are also on the property.  The Tulkoff Factory and Warehouse was built about 1964.  It was home to the George Gunther, Jr.  Brewing Company, founded in 1900.  By 1959 it was the second largest brewery in Baltimore, when it produced 800,000 barrels per year and employed approximately 600 people.  Hamm's Brewing Company bought the Gunther Brewing Company in 1960.  Later acquired by the F. & M. Schaefer Brewing Company in 1963, the plant was closed in 1978.  The Tulkoff company briefly used the factory for their sauce products at the conclusion of all brewing operations.

Trouble Brewing (brewery): Trouble Brewing is a brewery in Kill, County Kildare, Ireland, that produces a number of ales, IPAs, and stouts for the Irish market.  The brewery was founded by Paul O Connor, Stephen Clinch, and Thomas Prior in 2009.  Trouble Brewing was at the Bord Bía Bloom Festival in 2011.  Since June 2011, Trouble Brewing has been the first brewery in Ireland to accept payment in Bitcoin.

Pabst Brewing Company: The Pabst Brewing Company ( ) is an American company that dates its origins to a brewing company founded in 1844 by Jacob Best and was, by 1889, named after Frederick Pabst.  It is currently the holding company contracting for the brewing of over two dozen brands of beer and malt liquor from now defunct companies including Pabst Blue Ribbon, P. Ballantine and Sons Brewing Company, G. Heileman Brewing Company, Lone Star Brewing Company, Pearl Brewing Company, Piels Bros., Valentin Blatz Brewing Company, National Brewing Company, Olympia Brewing Company, Falstaff Brewing Corporation, Primo Brewing & Malting Company, Rainier Brewing Company, F & M Schaefer Brewing Company, Joseph Schlitz Brewing Company, Jacob Schmidt Brewing Company and Stroh Brewery Company.

Amana Colonies: The Amana Colony is seven villages on 26000 acres located in Iowa County in east-central Iowa, United States: Amana (or Main Amana), East Amana, High Amana, Middle Amana, South Amana, West Amana, and Homestead.  The villages were built and settled by German Pietists, who were persecuted in their homeland by the German state government and the Lutheran Church.  Calling themselves the Community of True Inspiration (German: "Die Gemeinde der wahren Inspiration" ), they first settled in New York near Buffalo in what is now the Town of West Seneca.  However, seeking more isolated surroundings, they moved to Iowa (near present-day Iowa City) in 1856.  They lived a communal life until 1932.

Metropolitan Brewing: Metropolitan Brewing is a brewery located in Chicago, Illinois that was founded in 2008 by (former) husband and wife team Doug Hurst and Tracy Hurst.  The brewery is located in a converted warehouse in a historically industrial area of the Ravenswood neighborhood in Chicago.  Metropolitan focuses on brewing lagers in the traditional German style.  They are the sole craft brewery in Chicago that produces only lagers.  Mr. Hurst has earned a brewing diploma at the Siebel Institute of Technology & World Brewing Academy.

Shipyard Brewing Company: Shipyard Brewing Company is a brewery and soft drink manufacturer in Portland, Maine, USA, and founded in 1994.  Shipyard is the largest brewer in Maine (owning the Shipyard, Sea Dog Brewing Company, and Casco Bay Brewing Company banners, and bottling under contract with Gritty McDuff's Brewing Company).  Shipyard is the fourth largest microbrewery in New England after Boston Beer Company, Harpoon Brewery, and Magic Hat Brewing Company.

Beer in San Diego County, California: San Diego County, California has been called "the Craft Beer Capital of America."  As of 2016 the county was home to 125 licensed craft breweries - the most of any region in the United States.  Based on 2016 sales volume, three San Diego County breweries - Stone, Green Flash, and Karl Strauss - rank among the 50 largest craft brewers in the United States.  San Diego County brewers pioneered the specialty beer style known as Double India Pale Ale (Double IPA), sometimes called San Diego Pale Ale.  Its beer culture is a draw for tourism, particularly during major festivals such as San Diego Beer Week and the San Diego International Beer Competition.  San Diego County breweries like Stone Brewing Co., AleSmith Brewing Company and Ballast Point Brewing Company are consistently rated among the top breweries in the world.

Nelson Brewing Company: The Nelson Brewing Company is a brewery located in Nelson, British Columbia, not to be confused with The Nelson Brewing Company in Chatham, Kent, England.  The original Nelson Brewing and Ice Company was founded in 1897 by Robert Reisterer.  The brewery fell on hard times in the 1960s, but in 1992 a group of local businessmen reopenned the brewery in its original historical building.  While most beer from the Nelson Brewing Company is consumed in the Kootenays, it is available across British Columbia.

Millstream Brewing: Millstream Brewing is a small American brewery founded in 1985 by Carroll F. Zuber and brothers James Roemig and Dennis Roemig in Amana Colonies Iowa.

Apohaqui, New Brunswick: Apohaqui ( ) is an unincorporated community in Kings County, New Brunswick, Canada, located on the Kennebecasis River at the confluence of the Millstream River.  Apohaqui straddles the River which is also the Studholm and Sussex parish boundary.

Supporting paragraphs: Millstream Brewing Amana Colonies
Answer: Iowa County