NSA Naples Completes Year-Long Radon Analysis at Non-Residential Facilities

U.S. Naval Support Activity (NSA) Naples in Italy has verified the presence of radon gas within several of its non-residential buildings following a comprehensive year-long environmental analysis. The study, which took place from August 2024 to September 2025, focused on identifying hazardous gas levels in facilities used for operational and administrative purposes rather than housing.

The findings were detailed in reports that circulated via Navy Times on May 7, 2026, indicating that the installation had been monitoring the air quality to ensure the safety of military personnel and civilian employees. The verification of radon presence has drawn the attention of the Department of Defense Office of Inspector General (DoD IG), which is responsible for reviewing safety protocols and hazardous material management across military installations.

Radon is a naturally occurring radioactive gas that is colorless, odorless and tasteless. It is produced by the natural decay of uranium found in soil, rock, and water. The gas typically enters buildings through cracks in the foundation, construction joints, or gaps around service pipes. Once trapped inside a structure, radon can accumulate to levels that pose significant health risks to occupants.

The presence of radon is a known geological characteristic of the Campania region of Italy, where NSA Naples is located. The area is situated near significant volcanic activity, including Mount Vesuvius and the Campi Flegrei caldera, which increases the likelihood of radioactive gases seeping from the earth into man-made structures.

According to established health guidelines from the U.S. Environmental Protection Agency (EPA) and the Department of Defense, prolonged exposure to high levels of radon is a leading cause of lung cancer among non-smokers. The gas decays into radioactive particles that can be inhaled and become trapped in the lungs, where they emit alpha radiation that damages lung tissue.

The year-long analysis conducted at NSA Naples was designed to capture seasonal fluctuations in gas concentrations. Radon levels often vary based on temperature and pressure changes, with concentrations typically peaking during winter months when buildings are sealed more tightly and the “stack effect” draws more soil gas into the interior spaces.

The involvement of the DoD Inspector General suggests a formal review of whether the installation adhered to mandatory safety standards and whether mitigation efforts were implemented in a timely manner. The DoD IG typically examines whether the command identified the risk, conducted appropriate testing, and communicated the findings to the affected workforce.

While the specific levels recorded in each building were not detailed in the initial reports, the U.S. Navy generally follows a tiered response to radon detection. When levels exceed established action thresholds, the military employs several remediation strategies to reduce the risk to personnel:

• Active Soil Depressurization: The installation of vent pipes and fans to pull radon from beneath the building slab and vent it safely into the atmosphere.
• Sealing Entry Points: Using specialized sealants to close cracks in floors and walls where the gas enters the facility.
• Improved Ventilation: Increasing the exchange of indoor air with outdoor air through HVAC adjustments or the installation of heat recovery ventilators.
• Continuous Monitoring: Deploying electronic sensors to track gas levels in real-time to ensure mitigation systems remain effective.

NSA Naples serves as a critical hub for U.S. Naval operations in Europe and Africa, acting as the headquarters for the U.S. Sixth Fleet. Because the installation houses a high volume of administrative staff and operational planners in non-residential offices, the verification of radon in these specific areas is a priority for occupational health and safety officers.

The Navy has not yet released a full public schedule for the remediation of all affected facilities, but the verification process is the first step in the regulatory requirement to bring the buildings into compliance with Department of Defense safety mandates. The current focus remains on identifying which specific non-residential structures require immediate intervention based on the data collected through September 2025.