Companies the use toxic processes and make products that are the cause of lead contamination and pollute the environment should be accountable and libel for the damages those processes and products cause. The taxpayers should not have to fund clean-up costs for companies that are making billions of dollars from their ongoing operations.
If a company pollutes and it effects something that is not theirs, then absolutely yes they should be responsible for that pollution. If they pollute and it does not harm anyone or leave an area that they themselves own then it would be entirely wrong to charge them anything for their pollution.
Yes, companies should be held responsible for lead contamination and pollution, because that is going way too far to hurting the environment. Coal power plants don't do anything that can't be abated. But lead contamination and pollution is a pretty obvious don't do. The companies that don't care should be held responsible.
Companies should be held responsible for lead contamination and pollution. This is because of the fact that the lead contamination and pollution that companies produce harms the environment in serious ways. Companies should not be able to contribute to an environmental disaster without paying for it with their responsibility to fix these problems.