40 CFR §35.10075

At a minimum, any recipient of Federal credit assistance under this part shall submit an annual project performance report and audited financial statements to EPA within no more than 180 days following the recipient's fiscal year-end for each year during which the recipient's obligation to the Federal Government remains in effect. EPA may conduct periodic financial and compliance audits of the recipient of credit assistance, as determined necessary by EPA. The specific credit agreement between the recipient of credit assistance and EPA may contain additional reporting requirements.