Massachusetts Denied Holtec Wastewater Discharge Appeal
State regulators upheld the denial of a proposal to release 1.1 million gallons of cooling water into Cape Cod Bay.
Updated on Sept. 18, 2026 in Nuclear
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The Massachusetts Department of Environmental Protection (MassDEP) has dismissed Holtec International's appeal regarding the discharge of nuclear wastewater from the retired Pilgrim Nuclear Power Station. This decision upholds the agency's initial July 2024 denial of the company's application to release 1.1 million gallons of industrial wastewater.
Why it matters
The decision centers on the Ocean Sanctuaries Act, which prohibits the discharge of industrial waste into protected marine areas. By classifying the remaining cooling water as industrial waste, state regulators have reinforced existing environmental protections during the ongoing multi-billion dollar decommissioning process.
MassDEP reviewed over 1,000 public comments and held three days of evidentiary hearings before concluding the water constituted industrial waste. This classification directly triggers the prohibition mandated by the Ocean Sanctuaries Act.
The players
Holtec International
An energy technology company managing the decommissioning of nuclear sites and global radioactive waste storage.
Massachusetts Department of Environmental Protection
The state agency responsible for protecting environmental quality and enforcing industrial waste regulations.
Bonnie Heiple
The Commissioner of the Massachusetts Department of Environmental Protection who issued the final dismissal of the appeal.
The details
The facility, which ceased electricity generation in May 2019, maintains 1.1 million gallons of water used for reactor cooling. MassDEP's oversight involved an extensive review process, including public comment periods and formal evidentiary hearings conducted by the Office of Appeals and Dispute Resolution (OADR). The final ruling aligns with the state's legal framework for protected ocean environments, maintaining the status quo for the site's decommissioning.
Timeline
May 2019: Pilgrim Nuclear Power Station ceased electricity generation.
July 18, 2024: MassDEP initially denied the discharge application.
August 16, 2024: Holtec appealed the initial permit denial.
November 2025: OADR issued a recommended decision to the Commissioner.
2034: Scheduled completion of site decommissioning.
The Tech Race
This decision marks a regulatory enforcement of the Ocean Sanctuaries Act, which dictates the operational constraints for decommissioned nuclear sites in Massachusetts. The ruling sets a strict standard for how site operators must manage and dispose of remaining cooling water while navigating state environmental law.
Residents of Cape Cod will not see the discharge of 1.1 million gallons of industrial wastewater into local waters, as the permit remains denied. The long-term decommissioning of the Pilgrim site continues toward a 2034 completion target regardless of this specific water disposal pathway.
The takeaway
This ruling highlights the significant regulatory hurdles inherent in decommissioning industrial-scale nuclear power infrastructure. Observers should track any potential filings from Holtec International in the Massachusetts Superior Court to see if the company pursues further litigation.
Further reading
Explore ongoing regulatory developments regarding the facility in Massachusetts Nuclear.
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