I definitely think it’s worth a call! The folks who are paid to do that sort of thing (environmental emergency response) really and truly very rarely know unless someone tells them. I also truly doubt it originates from the derailment. I think it’s much, much more likely some facility nearby made a “whoopsie” or something like that. Do you know how to check on the RCRA-regulated facilities near you? There’s an EPA website you can use to check which facilities near you have had violations, as well as check on the types of facilities near you that might one day have an “oopsie!”