Effective September 15, 2015 EPA will no longer offer the option to submit firm certification applications by mail. After that date all firm applications, payments, updates and certificate replacement requests will be done online. This change is part of an Agency effort to decrease cost and increase efficiency. The option to submit firm applications online has been available for some time; currently 85% of applications are submitted in this manner. Acceptable methods for payments online include credit card, debit card, or electronic check.