That’s … upsetting. Among the named chemicals (chloroform, bromidichloromethane, phthalates) I’m pretty sure only chloroform might be a breakdown product of VCM. Bromidichoromethane needs bromine which isn’t in VCM, and phthalates are bigger and more complex than VCM.
So the water wasn’t safe before the train crashed, and now it’s worse, and the company is haggling over how much worse while the governor literally caries water for them.