Fee payments may be submitted online in MiEnviro Portal using a credit card or by sending a check in the mail. Online payments by credit card are completed during the MiEnviro Portal permit application process or annual fee submission process and are subject to a non-refundable processing charge. To pay by mail, you must print the voucher at the end of the MiEnviro Portal permit application submission process or annual fee submission process and mail the voucher with the check. You may submit multiple checks for a single permit application fee. However, you may not submit one check to cover multiple permit applications.