Can you use the water for bathing at the moment? When you have a water birth the baby is not going to be drinking the water. The water will be touching their skin though. Their are different options for reducing you/your baby's exposure to the lead. Eg: If you get out of the bath soon after the baby is born they are not going to be in the water for very long. After your baby is born are you planning to bathe them/your other kids in the water? If so then I don't see how birthing in the water would be different. You could get out of the pool soon after the baby is born, and birth the placenta "on land".
The other issue would be your own exposure to the lead before the baby is born. If you were planning to use the pool as a main source of pain relief and to be in there for hours and hours that might be a concern- not so much for your baby, but for you. Maybe you would want to save the birth pool for the second stage only?
ETA: Are you having a midwife? Have you discussed it with them? They might have some ideas
Edited by ekbaby, 31 December 2012 - 02:16 PM.