Yn yr achos y cyfeiriodd Russell George AC ato, (Cyngor Sir Powys v Price a Hardwick (2017)), cafodd y Llys nad oedd Cyngor Sir Powys yn atebol o dan y drefn tir halogedig am adfer tir a halogwyd gan wastraff a ollyngwyd ar safle tirlenwi (sydd bellach wedi cau) oedd yn cael ei redeg gan ei ragflaenydd, Bwrdeistref Brycheiniog.
In the case to which Russell George AM referred, (Powys County Council v Price and Hardwick (2017)), the Court found Powys County Council was not liable under the contaminated land regime for the remediation of contaminated land associated with waste deposited at a (now closed) landfill site operated by its predecessor organisation, the Borough of Brecknock.