So, there I was, walking across the yard, when I heard a squish. I looked down, and there was a puddle in the yard. A really big puddle. I tried to think how long it had been since the last hard rain, and whether we normally get puddles in the front yard. Right about that time my mom showed up, so I didn't investigate further.
But I thought about it, and it just didn't seem right. And then I thought about the leaky pipe in the attic, and then I started thinking that maybe we'd sprung a leak in our main line, which runs right about where the puddle was. These were not happy thoughts.
When Husband got home, I told him about the puddle, and he went outside to take a look. That's when he remembered that when the air conditioning guy came out, they had turned on the spigot in the front and used the hose to wash down the compressor. And then he checked, and sure enough the faucet was turned on. Luckily, we have a nozzle on the hose, so the water wasn't flowing full force, but had been slowly leaking out where the hose was connected. For three weeks.