This presentation discusses the approach to design and construct a large data center campus, onsite underground attenuation tanks, lift stations, and other water and wastewater infrastructure. Data center infrastructure is sized for extreme weather conditions, creating high peaking factors for wastewater discharges and challenges for the receiving public collection systems. For the last few years, the artificial intelligence and cloud computing industry has seen extremely fast growth, with many large technology companies and developers entering the market. The infrastructure required to implement large-scale data computing can strain servicing utilities, which can be small or remote. This industry is still in its infancy, with many stakeholders developing their standard designs and operating procedures. That can make decision-making a challenge and can result in projects with minimal consistency between regions and ongoing changes to implement the most innovative technologies. The major needs of a data center site can be boiled down into 5 main areas: • Utilities (Electricity, Water, and Wastewater) • Speed • Resiliency • Security • Area Kimley-Horn works with clients to complete site design of data center campuses, which include water and wastewater analysis to establish improvements needed by the servicing public utilities. Data centers’ infrastructure is generally sized for extreme weather conditions, typically in the summer when temperatures are high and cooling needs are at peak levels. The needed service levels can create challenging peaking factors associated with the facilities. The high peak demands and discharges created during a very hot and extended periods of time can be too much for the existing utilities and downstream collection system; therefore, public improvements are required. Public improvements from the servicing utilities can include new plants, transmission, pumps, lift stations, upgraded lift stations, and thousands of feet of additional sanitary sewer. In one situation, while the public improvements helped, the peak discharge from the site was still required to be attenuated with onsite storage. Underground storage tanks of up to 0.5 MG were installed to store part of the discharge during peak periods. Through a detailed flow and weather analysis, discharges were modeled and the attenuation tanks sized to minimize the tank size while maximizing the capacity of the downstream collection system. The site is restricted by water quality requirements for supply and its cooling wastewater has discharge characteristics very different from typical sanitary sewage, with very little solids content and a normal pH range. This large volume, low concentration wastewater created a challenge for onsite treatment systems and the public utilities providing service. Variable frequency drives and flow meters were installed so the discharge lift station can maintain a constant discharge rate while the head conditions in the attenuation tank fluctuated up to 30 feet. The station can be monitored and operated remotely so discharge sampling requirements are met, and staff can easily operate the facility. Water is supplied from a separate utility than the wastewater, which created an additional complexity for the water and wastewater design. Several MGD of potable water was established and committed to the overall project.