YSI Inc.

YSI Inc., doing business as Yellow Springs International, manufactures water quality monitoring instruments, acoustic Doppler current profilers, multi-parameter sondes, sensors, and associated hydrologic equipment as a prime contractor to federal civilian and defense agencies, operating full-and-open competition across its entire recent portfolio with no socioeconomic set-asides. YSI is a for-profit manufacturer headquartered in Yellow Springs, Ohio, with subsidiaries including Design Analysis Associates Inc. and Meas US LLC; the company is owned by Xylem Inc., a global water technology conglomerate.

YSI's customer footprint concentrates heavily with the U.S. Geological Survey's Office of Acquisitions and Grants, which accounts for 510 awards (26% of all awards) and $190.7 million in combined potential value (81% of YSI's total federal revenue). The second and third tiers—the National Oceanic and Atmospheric Administration with 115 awards ($3.8 million) and the Bureau of Reclamation with 85 awards ($4.4 million)—represent a dramatic drop in both volume and dollars, underscoring USGS dominance. The Department of the Interior agencies collectively drive 86% of YSI's combined potential value across Geological Survey, Bureau of Reclamation, National Park Service, and Fish and Wildlife Service programs. Recent awards span portable groundwater quality monitoring systems measuring nitrates and turbidity ($21,162 to the Plains Area office, September 2026); laboratory instrument maintenance and repair services for the Defense Health Agency at Aberdeen Proving Ground ($131,181, September 2026); acoustic Doppler current profiler equipment to the Bureau of Reclamation including remote-controlled boats and flow meters ($28,070 to $54,079, September 2026); water level sensors for NOAA's environmental monitoring network ($93,215, August 2026); and external repair services for water quality equipment ($450,000 delivery order, July 2026).

YSI sits on multiple indefinite-delivery vehicles that anchor recurring business. The U.S. Geological Survey's Indefinite Delivery Contract 140G0121D0007, a $35 million single-award IDIQ established June 2, 2026, represents the largest active parent vehicle, with 69 task orders valued at $29.1 million and focused on replenishment of water quality instruments at the USGS Hydrological Instrumentation Facility in Tuscaloosa, Alabama and Yellow Springs, Ohio. Two predecessor USGS IDIQs—ING17PC00012 and ING13PC00018—remain active with 154 and 79 task orders respectively, carrying $24.1 million and $13.7 million in combined potential value. The Bureau of Reclamation maintains two single-award blanket purchase agreements with YSI: a $250,000 SonTek and YSI water quality equipment BPA established September 15, 2026 (covering Pro, Pro DSS, Pro30 meters, SonTek M9/S5 acoustic Doppler current profilers, Flow Tracker 2 velocimeters, and repair services), and a $749,000 BPA for EXO and Pro-Digital equipment, parts, and repair services established August 1, 2026. A third Bureau of Reclamation BPA for SonTek meter maintenance and repair ($100,000, established June 1, 2024) remains active through May 31, 2029. YSI also holds BPA INR09PA20035 with the Bureau of Reclamation carrying 25 task orders valued at $229 thousand.

YSI's product and service portfolio centers on water quality monitoring instrumentation. Concrete capabilities include EXO multiparameter sondes with depth ratings to 100 meters and configurable sensor ports; SonTek and YSI acoustic Doppler current profilers (ADCP), including the RS5 model and handheld Flow Tracker 2 velocimeters; Pro and Pro DSS handheld water quality meters measuring conductivity, temperature, dissolved oxygen, pH, turbidity, and other parameters; data loggers, telemetry stations, and remote-controlled autonomous platforms for streamflow measurement; water level sensors including the proprietary NILE FMR51 radar sensors deployed across NOAA's coastal observation network; laboratory analytical equipment including total organic carbon analyzers and Kjeldahl distillation systems; and field installation, calibration, repair, and maintenance services. Recent awards underscore the breadth: a SonTek RS5 ADCP system with Bluetooth GPS, flotation platform, and sensors ($37,555 to Bureau of Reclamation, September 2026); a YSI NILE sensor replenishment spares order for NOAA's National Ocean Service ($93,215, August 2026); under-ice electromagnetic communication equipment for NOAA's Great Lakes Environmental Research Laboratory ($37,961, August 2026); a Gerhardt Hydrotherm hydrolysis and Soxtherm extraction system for FDA ($132,375, August 2026); and external repairs of water quality monitoring equipment on a $450,000 delivery order basis.

Activity has declined modestly over the past five years, from 57 awards in 2022 to 26 in 2025 (a 54% drop) and rebounding slightly to 33 in 2026 year-to-date through late September. The combined potential value across the 1,940 awards in the source data totals $234.3 million; $123.5 million has been obligated, representing 53% draw-down. The recompete cliff shows 15 awards reaching ultimate completion within the next 24 months with combined potential value of $1.3 million—minimal exposure. YSI's award footprint is dominated by NAICS 334513 (Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables), covering 1,213 awards, and 384 awards under NAICS 334519 (Analytical Laboratory Instrument Manufacturing). The top PSC codes are Combination and Miscellaneous Instruments (558 awards) and Laboratory Equipment and Supplies (350 awards).

YSI received one federal contract sub-award: a $0-value line item from Fluor Marine Propulsion LLC on February 10, 2026, for an Xylem Autotitrator supporting management and operation of the Naval Nuclear Laboratory and Naval Nuclear Propulsion Program. This represents negligible subcontract activity; YSI operates almost exclusively as a prime.