YSI Inc.

YSI Inc., doing business as Yellow Springs International, is a manufacturer of water quality monitoring instruments and specialized hydrologic equipment that operates as a prime contractor across civilian federal agencies on full-and-open competition, with no set-aside participation. A subsidiary of Xylem Inc. headquartered in Yellow Springs, Ohio, YSI supplies multi-parameter water quality sondes, sensors, profilers, acoustic Doppler current profilers (ADCPs), handheld meters, flow tracers, water level sensors, and associated accessories—along with installation, calibration, repair, and maintenance services—to support federal water resource monitoring, environmental research, and scientific data collection missions.

The customer base is heavily concentrated with the Department of the Interior's U.S. Geological Survey (USGS), which accounts for 506 awards (26% of the prime footprint) carrying $190.3 million in combined potential value—approximately 82% of total potential value across all awards. The next four customer agencies by award count—the National Oceanic and Atmospheric Administration (112 awards, $3.6 million), the Bureau of Reclamation (79 awards, $3.3 million), the National Park Service Southeast Region (49 awards, $1.8 million), and the U.S. Army Corps of Engineers (46 awards, $1.7 million)—together account for only 9% of the combined potential value, signaling extreme customer concentration risk anchored to USGS delivery orders. Across 150 distinct customer agencies, YSI competes on unrestricted, full-and-open terms; the source names no 8(a), HUBZone, SDVOSB, WOSB, or other set-aside designations across the entire recent award footprint.

YSI holds position on five named parent vehicles: the USGS Indefinite Delivery Contract 140G0121D0007 (69 task orders, $29.2 million), the USGS Indefinite Delivery Contract ING17PC00012 (154 task orders, $24.1 million), the USGS Indefinite Delivery Contract ING13PC00018 (79 task orders, $13.7 million), the USGS Indefinite Delivery Contract ING08PC90067 (31 task orders, $3.9 million), and a Bureau of Reclamation Blanket Purchase Agreement INR09PA20035 (25 task orders, $229 thousand). The recent footprint shows YSI as the sole prime awardee on these vehicles; no subcontracting to other vendors is named in the awards listed. Separately, YSI is a named subsidiary in a sub-award to Fluor Marine Propulsion, LLC for the Naval Nuclear Propulsion Program, indicating rare sub-role exposure.

Recent activity has contracted materially: YSI received 57 awards in 2022, 56 in 2023, 40 in 2024, 26 in 2025, and only 15 in 2026 year-to-date. This 74% decline from 2022 to 2026 reflects shifting USGS procurement strategy or consolidation of requirements into fewer, larger delivery orders. Combined potential value across all 1,922 recent awards is $232 million, with $122.4 million (53%) obligated; roughly 10 awards carrying $908 thousand in combined potential value reach ultimate completion within the next twenty-four months, creating modest recompete exposure.

YSI's capability portfolio centers on proprietary and often sole-source water quality instrumentation. Representative prime awards include a $35 million USGS Indefinite Delivery Contract for hydrologic instruments replenishment (June 2026), a $1.8 million USGS delivery order for water monitoring equipment (January 2026), a $1.6 million USGS delivery order (February 2025), and a $1.5 million USGS delivery order (September 2025). The source documents numerous sole-source and competitive 8(a) awards—reflecting YSI's original equipment manufacturer status on USGS-specified sondes and sensors—alongside repair and maintenance calls against standing BPAs with the Bureau of Reclamation and Army Corps of Engineers. Specific product categories include EXO2/EXO3 multiparameter sondes, SonTek acoustic Doppler systems, NILE water level radar sensors, flow tracers, data loggers, and field installation and calibration services.

The corporate structure includes three named subsidiaries: YSI Incorporated, Meas US LLC, and Design Analysis Associates, Inc. Award data does not surface meaningful capability differentiation across the subsidiary structure; all work flows through YSI Inc. as the contracting entity. YSI is classified under NAICS 334513 (Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables, covering 62% of recent awards) and NAICS 334516 (Analytical Laboratory Instrument Manufacturing, covering 20%), with PSC framing centered on Combination and Miscellaneous Instruments (554 awards) and Laboratory Equipment and Supplies (346 awards). The vendor competes entirely as a manufacturer of goods; no IT services, consulting, or systems integration appears in the award record.