From Reg Z 1026.42
(g) Mandatory reporting. (1) Reporting required. Any covered person that reasonably believes an appraiser has not complied with the Uniform Standards of Professional Appraisal Practice or ethical or professional requirements for appraisers under applicable state or Federal statutes or regulations shall refer the matter to the appropriate state agency if the failure to comply is material. For purposes of this paragraph (g)(1), a failure to comply is material if it is likely to significantly affect the value assigned to the consumer's principal dwelling.
(2) Timing of reporting. A covered person shall notify the appropriate state agency within a reasonable period of time after the person determines that there is a reasonable basis to believe that a failure to comply required to be reported under paragraph (g)(1) of this section has occurred.
(3) Definition. For purposes of this paragraph (g), “state agency” means “state appraiser certifying and licensing agency” under 12 U.S.C. 3350(1) and any implementing regulations. The appropriate state agency to which a covered person must refer a matter under paragraph (g)(1) of this section is the agency for the state in which the consumer's principal dwelling is located.
There are some fairly hefty penalites as I recall for not reporting violations. I believe the first violation is $10,000 per day and the second violation is $25,000 per day. Don't quote that as fact though.
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The opinions expressed are mine and they are not to be taken as legal advice.