How long, what type of radiator (aluminum or brass/copper), new pump or old, did you have coolant with the water or just straight water, where in CA? Distilled water is preferable if you have tap water with a high mineral content. I'm certain somebody will show up and tell you that your tap water was what caused your pump to leak (and of course thinning hair, later life acne, neuritis, neuralgia and lumbago), but it won't be me. I've seen pumps go bad from people running straight tap water with no coolant (anti-rust, anti-freeze, etc), but even that takes a while unless the pump is on the way out the door already.
