Birchhaven, knowing what I do about electricity, there is no way you could get enough energy from this type of electric field to hurt anybody. The frequency and power levels are way to low to couple anything.
Now a submersable pump is theoretically prone to physical damage to the motor or wire insulation that could couple power directly to the water. An onshore pump is less vulnerable.
Theres lots about electcuting swimmers on the internet. I read that salt water is safer than fresh. If a bare hot conductor is in the water, some of the current will travel through the water to ground, as it's the easiest path. Since salt water is more conductive than humans, the current stays in the water and out of your body. Since lake water is less conductive, you become the path of least resistance.
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