Jaqua's seventh goal of the season came off a head pass by Steve Zakuani in the 70th minute.
The Dynamo had gone ahead 1-0 on a goal by Geoff Cameron in the 36th minute.
Houston (11-6-7) is in first place in the West, five points ahead of the Los Angeles Galaxy. The Sounders (8-6-9) are tied with Chivas USA for third place in the Western Conference.
Copyright 2009 by United Press International.
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