I'm afraid it is. The garage is part of my basement. I had the contractor I've used in the past (and who, ahem, did the work that led to my little in-house waterfall) take a look at it yesterday. He sourced the leak to some flashing by my front door. He thinks he's fixed it. It's supposed to rain more this week (joy) and I have to keep a close eye on it. If the leak is plugged, I have to get him back here to replace the waterlogged insulation (R38 fiberglass can hold a lot of water apparently) and Typar. Fortunately, my only costs are materials.
Ah, home ownership. Where's that image of the Joker setting a mountain of money on fire when you need it?