In my res, I (try) to have a sugarcane farm. the problem with this is, the water keeps freezing. you can see for proof at /v 1718 and stand on the Goto farm pad. Look inside either the (empty now) sugarcane farm or my wheat farm. it doesn't affect my well though, i dont know why..
Your in an ice biome. You'll have to keep the light level high enough to keep it from freezing, either that or cover it up (don't let it be open to the sun)
To get rid of the ice place a block above it and then break the ice and then it shoulndt freeze again whilst the block is above it.