YSI INCORPORATED

YSI INCORPORATED specializes in the design, procurement, and maintenance of advanced hydrologic and industrial process measurement instruments, with deep expertise in acoustic Doppler current profilers (ADCPs), real-time telemetered data collection systems, and precision flow monitoring equipment. The company delivers mission-critical instrumentation for water velocity, stage, and discharge measurement, supporting field operations in complex aquatic environments. Their technical capabilities include the repair and calibration of high-end river surveying systems such as the M9 River Surveyor and PCM3-RTK platforms, alongside integration of ruggedized sensors for remote, unattended data acquisition. YSI’s unique specialization lies in sustaining the operational readiness of sensitive hydrographic instrumentation under demanding field conditions, ensuring data integrity for scientific and infrastructure applications. The contractor maintains a strong, recurring relationship with the Department of the Interior, providing instrumentation for national wildlife refuges and water monitoring programs, including installations at Quivira and Pahrangat. They also support the Department of Defense with maintenance and parts replacement for coastal and hydraulic infrastructure systems, and have delivered valve systems to the Department of State for international water boundary projects. Their work with the Department of Agriculture focuses on instream flow assessment tools critical for ecological monitoring. YSI’s primary industry focus is in the manufacturing and servicing of industrial process measurement instruments, particularly those used in hydrology and environmental monitoring. They are positioned as a niche provider of specialized, high-accuracy sensors and repair services for federal agencies requiring reliable field-deployed hydrographic data systems. Headquartered in San Diego, California, YSI INCORPORATED operates as a small business with no federal certifications. Their geographic presence supports nationwide federal water resource and infrastructure missions, with a focus on technical service and instrumentation lifecycle management.