The Office of Campus Sustainability, along with the Facilities Planning and Management team, continuously monitor metrics related to Catholic University’s use of energy and water utilities as well as generation of waste and greenhouse gas emissions. These metrics help us understand Catholic University’s environmental impact as well as provide insight into campus operations to support decision making.

The decreases in energy use, water use, waste generation, and greenhouse gas emissions over the past year are an encouraging sign of Catholic University’s commitment to its environmental impact. The campus aims to maintain these decreases with the continued implementation of the Sustainability Plan (2021-2025). To accomplish this and make long-lasting impactful changes, coordinated action is needed from all students, faculty, and staff.

Energy

Energy, in the form of electricity or natural gas, accounts for the majority of campus utilities. Electricity is primarily used for cooling, lighting, and powering general appliances and computers. Natural gas is primarily used for powering boilers and other steam system components that warm buildings on campus.

Trends. Energy use over the past decade has remained mostly consistent, with a peak in FY 2019 and a dip in FY 2021 due to a decrease in campus occupancy during the pandemic. In FY 2022, we started seeing a slight year-over-year increase in energy use as faculty, staff, and students returned to campus on a more regular schedule, as well as the addition of two new buildings to campus: Garvey Hall in FY 2024 and the Conway School of Nursing Building in FY 2025. 

Progress. As of the end of FY 2025, the University has achieved a 9% reduction in energy use compared to FY 2016. 

Water

On campus, water is used for faucets, toilets, and showers as well as to heat and cool buildings.

Trends. Water use over the past few years has remained fairly consistent. In FY 2021 there was a significant decrease in water use, which can be attributed to the COVID-19 pandemic which sent faculty, staff, and students home. Water use increased by 170% in April 2021 compared to April 2020 which can be attributed to the return of campus activity. Water use increased in FY 2023 and has remained consistent in the years since. 

Progress. As of the end of FY 2025, the University has seen a 16% increase in water use compared to FY 2016. 

Waste

Waste refers to all items discarded and removed from the University, including recycling, compost, and trash. The Pryzbyla Center contains three-way separation bins for trash, recycling, and compost. Elsewhere on campus, you can find trash and recycling bins dispersed throughout the residence halls, administrative buildings, and academic buildings.

Trends. University waste data is available starting in FY 2019. From FY 2021 to 2022, we saw a significant increase in trash generation (waste sent to landfill), which can be attributed to the increased use of masks, cleaning supplies, and single use items during the COVID-19 pandemic. However, in the years since the community returned to campus, the diversion rate has increased significantly, from a low of 24% in FY 2022 to a high of 51% in FY 2025. 

Progress. As of FY 2025, the University has achieved it goal to divert over 50% of waste generated on campus from landfill.

Greenhouse Gas Emissions

Greenhouse gases are emitted as the result of everyday activities such as turning on lights and driving to campus. These emissions, which include gases such as carbon dioxide, methane, and nitrous oxide among others, contribute to global climate change. To learn more about the impact of emissions on climate change, review the Fourth National Climate Assessment.

In FY 2024, Catholic University emitted 14,757 metric tons of carbon dioxide equivalent emissions. This is equivalent to the greenhouse gas emissions from driving 37.6 million miles in an average passenger vehicle or the carbon dioxide emissions from charging 1.2 billion smartphones.

Trends. Since the University first started tracking emissions in FY 2007, it has reduced total emissions by over 64%. Recent years show a gradual decline in overall emissions, despite an increase in the space on campus due to the opening of Garvey Hall and the Conway School of Nursing.

In GHG inventories, emissions are broken into three categories to better understand the source of emissions and how to control them.

Scope 1 emissions are emissions that an organization can directly control. This category includes on-campus natural gas use, fleet fuels, and refrigerants. Scope 1 emissions increased by 22% in FY 2024 compared to FY 2023.

Scope 2 emissions are emissions from purchased electricity sources, such as electricity, steam, heat, and cooling. Catholic University has zero scope 2 emissions due to the purchase of Renewable Energy Credits (RECs). RECs ensure that the electricity we purchase is offset with the generation of renewable energy.

Scope 3 emissions, which are the most difficult to measure and control, include emissions from sources that are not owned or controlled, but that the organization indirectly impacts. Scope 3 includes emissions from commuting, travel (including study abroad and directly financed University travel), waste generation, wastewater, paper purchases, and transmission and distribution losses (associated with electricity use on campus). Scope 3 emissions decreased by 10% in FY 2024 compared to FY 2023.

Goal. By the end of FY 2025, the University aspires to reduce carbon emissions by 20% compared to FY 2016 levels. As of FY 2024, the University has achieved a 30% reduction.