All Companies disposing into the sewer must be registered with the City of El Dorado.(This can be included from a billing perspective,... More… All Companies disposing into the sewer must be registered with the City of El Dorado.(This can be included from a billing perspective, but I'm not sure we really have a registration form developed) Maybe we say in order to discharge into the sewer you have to have an account in good standing, etc. If you are unsure please contact the billing office at 316-321-9100 ext. 1Less…