Delaware Code
Subchapter II. Uniform Environmental Covenants Act
§ 7914. Duration.

(a) An environmental covenant is perpetual unless:

(1) Limited by its terms to a specific duration or the occurrence of a specific event;
(2) Terminated by consent pursuant to § 7915 of this title; [or]
(3) Terminated pursuant to subsection (b) of this section or
(4) Terminated or modified by judicial decree in an eminent domain proceeding, if:

a. The Department consents to the judicial action; and
b. All persons identified in § 7915(a) and (b) of this title are given notice of the pendency of the eminent domain proceeding.
(b) A judicial decree terminating an environmental covenant or reducing its burden on the real property subject to the covenant under the doctrine of changed circumstances may be rendered only after:

(1) All persons identified in § 7915(a) and (b) of this title are given notice of the pendency of the judicial proceeding in which the determination is sought; and
(2) The Department has filed a determination with the court that the intended benefits of the original covenant can no longer be realized.
(c) Notwithstanding anything to the contrary contained in this subchapter, an environmental covenant may be amended or terminated if the environmental covenant:

(1) No longer serves its intended purpose;
(2) No longer provides the intended benefits;
(3) No longer or does not provide for protection of human health or the environment; or
(4) Becomes unnecessary because of changed circumstances, including changes in law, regulation or ordinances.
Any person having an interest in real property subjected to an environmental covenant shall be entitled to apply to the Department for amendment or termination of the environmental covenant in accordance with the procedures set forth in § 6004 of this title. Any decision of the Secretary regarding an amendment or termination of an environmental covenant shall be subject to appeal in accordance with the procedures provided for appeals under subchapter II of Chapter 60 of this title. If an environmental covenant is amended or terminated the amended environmental covenant or notice of termination shall be recorded in accordance with requirements set forth in § 7913 of this title.
(d) Except as otherwise provided in subsections (a) and (b) of this section, an environmental covenant may not be extinguished, limited, or impaired through issuance of a tax deed, foreclosure of a tax lien, or application of the doctrine of adverse possession, prescription, abandonment, waiver, or lack of enforcement, or any similar doctrine.