The backers behind the Neponset Wharf project in the Port Norfolk neighborhood are re-doing their proposal after Gov. Healey’s environmental chief said the project’s environmental impact report “does not adequately and properly comply” with the Massachusetts Environmental Protection Act.

Rebecca Tepper, Healey’s secretary of energy and environmental affairs said the Ericsson Street project needs further analysis on the impact to coastal wetlands.

The 3.6-acre mixed-use development, approved by the Boston Planning and Development Agency (BPDA) in January 2022, was first proposed in 2017. The plan spans 202,700 square feet across four buildings and includes the renovation of a 75-slip marina. Three of the buildings would reach a height of five stories, with each including between 30 to 50 units and parking spaces for vehicles and bicycles, while the fourth is a boathouse with marina office space and 20,300 square feet for boat storage.

The project calls for 2.17 acres of public open space, including a harbor walk, and a new stormwater management system, a water taxi dock, new marina piers, and floating docks. Sediment would be drudged, and five existing buildings would be demolished.

Tepper’s letter, dated July 14, said several people who offered public comments on the project “expressed concern about the potential for the project to cause flooding impacts on the adjacent residential neighborhood.” She added that “additional information and analysis are necessary to evaluate the impacts associated with the proposed development of the coastal floodplain and to demonstrate that the project will take all feasible measures to avoid, minimize, and mitigate impacts.”

A spokesperson said the proponents, which include RISE Together, a developer headquartered in Port Norfolk, would rework the project.

The residential neighborhood has historically served as a home to commercial and industrial entities, including yacht builders and a nail company. The project, if it comes to fruition, would bring retail space and offices, in addition to residences and a new boathouse.

Kathy Abbot, president and CEO of the advocacy group Boston Harbor Now, said in a comment letter to Tepper that they welcomed the renovated marina and new boathouse, open space, and public walking paths. But she said rising sea levels present a challenge to building a climate resilient structure. “While the proponent has laid plans for flooding in the next 50 years, we also hope they consider the following 50 years as well,” she wrote.

Her letter also called for widening the public walking paths.

The Neponset River Watershed Association also weighed in. Its advocacy director, Kerry Malloy Snyder, in her own letter, said the organization is “generally supportive” of redevelopment projects such as Neponset Wharf. “We are pleased with many of the changes that have been made since the original proposal (in 2017), including additional information about the shoreline, water-dependent uses and the location of green spaces and public access along the outer edges of the plan,” she wrote.

“Additionally, we appreciate the proponents’ commitment to achieving significant energy efficiency and use of renewable energy within the new buildings and their operations.”

But she added they remain concerned about some lack of detail. “We continue to urge the proponent to conduct a robust analysis of the impact of such a large development on the existing neighborhood of Port Norfolk, particularly with regards to storm surges and stormwater management,” she wrote.