I'm not sure, in every jurisdiction, that checking with the jurisdiction is the wisest choice for the first call, other than where it is required. Some may be rather unschooled in the niceties, and may have impractical suggestions or unreasonable demands. Too often, I see all photo chemicals lumped in together as if they all had one environmental profile, and one mitigation routine. Perhaps larger and more sophisticated municipalities will have an accurate understanding of the various materials involved, but I'd look before I leap. Regardless, responsible disposal is a responsibility and educating yourself is the first step. Many people here have a great deal of knowledge they are happy to offer.