The U.S. General Services Administration (GSA) recently initiated its Water Testing Modification Effort to assess and ensure the quality of drinking water in properties currently under lease with GSA. GSA began issuing unilateral lease amendments (ULAs) to landlords in February 2024, requiring the landlord to conduct one-time drinking water testing within the leased space and building common areas. Per GSA, the Water Testing Modification Effort is in response to water stagnation concerns, and especially the potential for legionella bacteria amplification. Importantly, landlords must complete the water testing pursuant to a prescribed scope of work provided with the ULA, and report the testing results to GSA within 90 days of receipt of the amendment.