Information for Washington
Washington requires training and certification for its contractors through a state approved trainer. Guidelines are listed for Sampling procedures, waste disposal, soil cleanup, asbestos, and work plan templates. The decontamination procedure itself seems to be vague but extensive oversight is provided by the health department including testing. The decontamination standards for methamphetamine are listed as ≤1.5ug/100cm² according to WAC 246-205-541 which was changed from ≤0.1ug/100cm² in 2015.
Washington State Department of Health
The DEA has kept a catalog of properties since 2004 across the nation of locations of clandestine meth lab busts completed by their department, check to see if your property is on their list:
EPA Voluntary Guidelines for Methamphetamine Laboratory Cleanup