Canadian communities angered by perceived American chauvinism have started a Buy Canadian campaign to exclude U.S. bidders from municipal contracts. “If that sticks, well, there goes 25% of my business,” said Mr. Pokorsky. “To me, Ontario may as well be Indiana.”

Halton Hills, a town of 50,000 people about 25 miles west of Toronto, is one of about a dozen Canadian communities forging ahead with plans to amend their procurement policies to freeze out American companies. “We won’t be taking any products from any country that is discriminating against us,” said Mayor Rick Bonnette.
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Aquarius gets a lot of its parts from abroad, particularly from Canada. Such integration became even tighter after the North American Free Trade Agreement in 1994 joined the U.S., Canada and Mexico in a free flow of goods and services.

Trojan Technologies Inc. of Ontario, North America’s dominant maker of ultraviolet disinfection equipment for treating sewage, is a key supplier to Aquarius and other companies. Because of the Buy American provisions, Trojan has had to shift production to a plant in Valencia, Calif., a move that has resulted in delays and additional costs being passed on to customers, said Trojan executive Christian Williamson.