I think I figured out the problem. The pressure relief valve is right on top of the tank and I added a drain line to it the same time I removed the blanket. I checked and water is ever so slightly dripping from that drain.
I bet the water was dripping from that valve and pooling on top of the WH but now that I've got a drain pipe it's routing elsewhere. Now to figure out why that valve is leaking. My city code only requires a pressure overflow tank if the pressure is over 80 PSI. I'm pretty sure the PSI isn't over 80 in my neighborhood and I didn't have an overflow on my old tank. So it's either a faulty TPR valve or it's got some dirty or something in it and not closing...
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