The City of Nampa issued a water pressure advisory after a mainline break on Garrity Boulevard caused pressure to fall below 20 pounds per square inch on August 11, 2026. Although pressure has since been restored, city officials are taking precautionary measures to ensure water quality and public safety throughout the affected service area.
The pressure drop occurred in a localized section of the water distribution system. Despite the temporary loss of pressure, city engineers confirmed that positive pressure was maintained across the broader network, limiting the risk of bacterial contamination entering the water supply. The City of Nampa assessed the situation as low-risk and determined that no boil advisory or do-not-drink notice was necessary.
Precautionary Water Testing Underway
Following the incident, the city collected additional water samples for quality testing to verify that the water system remains safe for consumption. City officials will notify customers of any further action if test results indicate additional measures are needed. Residents can contact the City of Nampa Public Works Department at 208-468-5860 for updates or questions about water quality.
The city recommends that all residents practice basic hygiene precautions, including washing hands with soap and running water for at least 20 seconds, particularly before eating or preparing food and after using the restroom.
Infrastructure Maintenance Challenges in Canyon County
The Garrity Boulevard break is the latest in a series of water system challenges affecting Nampa’s aging infrastructure. A previous water main break disrupted traffic at Nampa’s Garrity Interchange on I-84, highlighting the ongoing maintenance demands on the city’s water distribution network. As Canyon County communities continue to grow, maintaining and upgrading water infrastructure remains a critical priority for municipal budgets and operations.
The City of Nampa’s water system serves residents across a sprawling service area, making the detection and repair of mainline breaks a complex undertaking. The rapid identification and repair of the Garrity Boulevard break demonstrates the city’s capacity to respond to infrastructure emergencies, though questions about long-term system resilience persist as Nampa and surrounding communities in the Treasure Valley continue to expand.
What Comes Next
Residents should continue to monitor communications from the City of Nampa for any updates regarding water quality or system status. The city will publish results of water quality testing and issue notifications if boiling or other precautions become necessary. For additional information, contact the City of Nampa Public Works Department at 208-468-5860 or visit the city’s official website.
The advisory notice was posted on August 12, 2026, and the system’s water quality remains under active monitoring.