Sihalla Zakaria

Sihalla Zakaria, doing business as Hydrotech ZS Consulting, a minority-owned, Hispanic American-owned sole proprietorship based in Round Rock, Texas, manufactures and repairs hydrologic instrumentation and water quality monitoring equipment as a prime contractor exclusively on full-and-open federal procurements with no set-aside designations. The vendor operates as a sole source manufacturer and authorized repair depot for multiparameter sondes, total dissolved gas monitoring sondes, E-HUB interfaces, and related water quality accessories critical to federal surface and groundwater data collection programs.

Hydrotech ZS Consulting's customer base concentrates almost entirely on the Department of the Interior's U.S. Geological Survey, which accounts for 42 of the vendor's 88 total awards (66% of award count) and $2.5 million of $4 million combined potential value (91% by dollars). Secondary customers are the Department of the Army (including the Army Corps of Engineers' regional engineering districts at Walla Walla and Seattle), the Environmental Protection Agency's Office of Research and Development, the Department of the Interior's Fish and Wildlife Service Region 2, and the Department of Agriculture's Forest Service. This concentration reflects the vendor's specialization: USGS's Hydrologic Instrumentation Facility and field-based water monitoring programs generate the vast majority of federal demand for the equipment and repair services Hydrotech ZS Consulting supplies.

The vendor holds two single-award indefinite delivery contracts anchoring its federal footprint. A $450,000 IDIQ with USGS's Office of Acquisitions and Grants, effective July 31, 2023, through July 30, 2026, has generated six delivery orders totaling approximately $432,000 (96 percent utilization) for supply, maintenance, and repair of hydrologic instruments and water quality accessories. A more recent $750,000 single-award IDIQ with the Department of the Army, effective September 22, 2025, through September 22, 2030, addresses headquarters sonde and total dissolved gas monitoring equipment requirements; the initial delivery order under this vehicle, valued at $151,873.50 and awarded September 24, 2025, supports water resource monitoring in the Pacific Northwest. Representative recent work also includes a $100,000 delivery order from USGS (July 2025) for water monitoring equipment maintenance and repair, an $18,000 delivery order from USGS (June 2026) for hydrologic instrumentation and water monitoring equipment, and an $81,141.36 purchase order from the Army Corps of Engineers (April 2024) for multiparameter sondes. The vendor also services five other IDIQ vehicles held with prior USGS contracts and Army Corps of Engineers regional engineering districts, generating task orders across those vehicles for equipment supply and repair work.

Activity has been sparse and episodic. The vendor recorded one award in 2022, seven in 2023, three in 2024, four in 2025, and one thus far in 2026, with cumulative obligation at $2.2 million (54 percent of combined potential value). Four awards with ultimate completion dates in the next twenty-four months carry combined potential value of $320,000, representing moderate recompete exposure. The vendor operates exclusively at its Round Rock, Texas facility and does not subcontract; all 88 awards are prime contracts or delivery orders. Hydrotech ZS Consulting's manufacturing footprint (NAICS 334515 — Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables) and repair services (NAICS 811219 — Other Electronic and Precision Equipment Repair and Maintenance) align with its established role as the federal government's specialized supplier for water quality instrumentation in hydrological research and natural resource monitoring.

Water Quality Monitoring Equipment manufacturing and Sale