According to 33 USCS § 2902 (4), the estuary habitat restoration activity is:
“(A) In general. The term "estuary habitat restoration activity" means an activity that results in improving degraded estuaries or estuary habitat or creating estuary habitat (including both physical and functional restoration), with the goal of attaining a self-sustaining system integrated into the surrounding landscape.
(B) Included activities. The term "estuary habitat restoration activity" includes--
(i) the reestablishment of chemical, physical, hydrologic, and biological features and components associated with an estuary;
(ii) except as provided in subparagraph (C), the cleanup of pollution for the benefit of estuary habitat;
(iii) the control of nonnative and invasive species in the estuary;
(iv) the reintroduction of species native to the estuary, including through such means as planting or promoting natural succession;
(v) the construction of reefs to promote fish and shellfish production and to provide estuary habitat for living resources; and
(vi) other activities that improve estuary habitat.
(C) Excluded activities. The term "estuary habitat restoration activity" does not include an activity that--
(i) constitutes mitigation required under any Federal or State law for the adverse effects of an activity regulated or otherwise governed by Federal or State law; or
(ii) constitutes restoration for natural resource damages required under any Federal or State law.”