Losing coolant 95 E320

[Kestas]

During winter storage, I noticed a puddle of coolant develop under the car. Now that I'm getting the car ready, I washed underneath to see where the coolant redevelops and follow the traces. So far, I get coolant drops forming at the bottom of the oil pan, toward the front. I can trace it to the top of the pan, but no further. I've lost almost a gallon of coolant. Is this from my water pump?