>> lisa grogan's son battled rare kidney cancer. she and other parents with cancer in the area aren't pointing fingers but are wondering if toxins in drinking water was the cause? >> because of what our kids have been through. hard to look at out us and say the water is probably okay. we are not willing to accept that risk. >> amy herman's son, jacob had leukemia. >> seems odd we are having to fight for clean water after we have fought for our children's lives. >> reporter: there are currently no federal drinking water standards for genx. under epa rules, dupont and the release of genx into the water may have been perfectly legal. that's because the it is a byproduct of another substance. >> there is a loophole that needs to be looked at. by congress to make certain that we have safe, good drinking water. in this country. >> state inspectors are now testing the current levels of genx in wilmington's water and the epa is also investigating. >> we as citizens of this nation, need to know what those chemicals are. so at least we can ma

lisa grogan's son nathan battled a rare kidney cancer. she, like many other parents of children with cancer in the area, aren't pointing fingers but are wo in their drinking water were the cause. >> because of what our kids have been through, i think it's hard for people to look at us and say, the water's probably okay, we're not willing to accept that risk. >> reporter: amy herman's son jacob had leukemia. >> it just seems odd that we're having to fight for clean water after we've fought for our children's lives. >> reporter: there are currently no federal drinking water standards for genx. and under e.p.a. rules, dupont and chemours' release-of-genx into the water may be perfectly legal, that's because it's a by- product of another substance. >> there is a loophole that needs to be looked at by congress to make certain that we have safe, good drinking water in this country. >> reporter: state inspectors are now testing the current levels of genx in wilmington's water and the e.p.a. is also investigating. >> we as citizens of this nation

and lisa grogan's son nathan was diagnosed at age 4 with wilms, a rare kidney cancer. >> what we've beenhink it's hard to look at us and say the water's probably okay or there's probably not too much toxin in there to cause health effects. >> reporter: there are currently no federal drinking water standarded for genex and because of the rule, their release into the river for nearly four decades may have been perfectly legal. that's because it's a by-product of another substance. >> there's a to be looked at by congress to make certain that we have safe good drinking water in this country. >> reporter: long-term health effects of genex are unknown but studies from dupont between 2006 and 2013 shows it caused tumors and reproductive problems if lab animals. the company says genex is safer than another dupont chemical called c-8 uks which it no longer makes. dupont was ordered to pay a fine. this past february dupont and chemours domed out more than $6 million over the contamination in the ohio river valley. jennifer adams was asked why the water company never made its genx study public. >>