Summary
The cause of the lack of water pressure could be a broken water line from the well to the house, a bad check valve just above the submersible pump at the bottom of the well, a bad connector leaving the well casing, or a broken water line inside the well casing.
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To check if the issue is related to power, one should start by checking the well switch located near the pressure tank and the well's double-pole circuit breaker.
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If the pressure switch is bad, it should be replaced and the pressure tank should be tested to make sure it isn't waterlogged.
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If banging on the tube under the pressure switch kicks on the well pump, it means the contact surfaces of the electrical contacts are pitted or burned, causing a poor connection.
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