* Panel says Quebec, Ontario programs contravene deal-USTR

* Canada must impose charges on exports from the provinces

* If Canada doesn't comply, U.S. can impose duties

(Adds details and background throughout)

By Roberta Rampton and Doug Palmer

WASHINGTON (Reuters) - A binding arbitration panel has ruled Canada has again breached its softwood lumber deal with the United States, this time with aid offered by provincial governments in Quebec and Ontario, the U.S. Trade Representative said Friday.

It marks the second recent win for the United States on the perennially thorny trade issue. It won a similar case at the London Court of International Arbitration in 2009, and last week launched a third case. [ID:nN18153348]

"This result is important for U.S. workers, firms and our softwood lumber industry. We look forward to Canada working quickly to implement the decision of the tribunal," U.S. Trade Representative Ron Kirk said in a statement.

A spokesperson for the Canadian government was not immediately available for comment.

Lumber producers in the United States have complained for decades that Canada unfairly subsidizes its producers.

In 2006 the two countries agreed to stop fighting about lumber in the courts, and signed a seven-year deal that allowed for binding arbitration of any issues.

In the arbitration result announced Friday, the London tribunal ruled that provincial grants, loans, tax credits and other programs in Ontario and Quebec did not comply with the terms of the deal, according to the USTR.

Canada now must impose additional charges on lumber exports to the United States from the two provinces, collecting an estimated $59.4 million, the USTR said.

If Canada does not comply within 30 days, the United States can impose additional import duties on Canadian lumber, the USTR said. (Additional reporting by Louise Egan in Ottawa; Editing by Xavier Briand)