Assuming the spring water company is actually complying with the limits. That would also be worth testing. I wouldn't be particularly surprised if a spring wate

Assuming the spring water company is actually complying with the limits. That would also be worth testing. I wouldn't be particularly surprised if a spring water company was lax with ongoing testing and making sure to test the water once it has been through their whole process and is in bottles. There was a case with cranberry juice in Australia (I think it was) where school kids tested store bought cranberry juice and found it contained zero vitamin C. Something about the way the juice was processed and bottled destroyed all the vitamin C but no one had ever bothered to test the juice after processing and bottling.