Remedies available to the commission in enforcement actions include all those found in the Texas Water Code, the Texas Health and Safety Code, and the APA. These include, but are not limited to, issuance of administrative orders with or without penalties; referrals to the Texas Attorney General's Office for civil judicial action; referrals to the Environmental Protection Agency for civil judicial or administrative action; referrals for criminal action; or permit, license, registration, or certificate revocation or suspension. Nothing herein shall be construed to preclude the executive director from seeking any remedy in law or equity not specifically mentioned in these rules. In addition, an enforcement matter may be resolved informally without a contested case proceeding in appropriate circumstances.