Sihalla Zakaria

Sihalla Zakaria, doing business as Hydrotech ZS Consulting, is a minority-owned, Hispanic American-owned sole proprietorship based in Round Rock, Texas, that manufactures and repairs hydrologic instrumentation and water quality monitoring equipment as a prime contractor exclusively — operating as the sole qualified source and authorized repair depot for multiparameter sondes, total dissolved gas sondes, depth sensors, E-HUB interfaces, and related water quality accessories for federal surface and groundwater data collection programs.

The vendor's customer concentration is extreme and deliberate. The Department of the Interior's U.S. Geological Survey Office of Acquisitions and Grants accounts for 44 of 91 awards (67% of the award count) and $3.4 million of the $5 million combined potential value (68% of dollars). The Department of the Army places the second-largest dollar volume at $970 thousand across three awards, followed distantly by the Army Corps of Engineers' multiple districts (five to two awards each, $97 thousand to $72 thousand per grouping). These five customer entities represent 93% of combined potential value. Hydrotech ZS Consulting holds no subcontracts and does not subcontract; all work is performed in-house at the Round Rock facility, with secondary performance locations in Walla Walla, Washington for Army and Army Corps of Engineers field work.

The vendor operates across five parent IDIQs. Two single-award contracts with USGS dominate the vehicle portfolio: a $450 thousand IDIQ effective through July 30, 2026 (9 task orders, $343 thousand obligations) and another IDIQ that expired in 2023 (6 task orders, $449 thousand). The Army awarded Hydrotech ZS Consulting a new $750 thousand single-award IDIQ on September 22, 2025, running through September 22, 2030, for headquarters sonde and total dissolved gas monitoring requirements in the Pacific Northwest; two delivery orders totaling $219 thousand have been issued to date. Army Corps of Engineers IDIQs (vehicles ING17PC00052, ING17PC00056) carry lower ceiling values and place episodic task orders for sonde repairs and multiparameter sonde supply.

Activity has been episodic. The vendor recorded one award in 2022, seven in 2023, three in 2024, four in 2025, and four in 2026. Two awards (combined potential value $345 thousand) face ultimate completion inside the next twenty-four months and thus expose the vendor to recompete risk, though the USGS IDIQ running through July 2026 and the newly awarded Army IDIQ through 2030 provide continuity of ordering authority. Recent work samples the vendor's core scope: an $18 thousand delivery order from USGS (June 3, 2026) for hydrologic instrumentation and water monitoring equipment; a $700 thousand time-and-materials purchase order from USGS (August 18, 2026) for repair, recalibration, and maintenance of water quality sondes, sensors, and accessories with a $700 thousand ceiling and four one-year option periods through July 21, 2031; a $193 thousand purchase order from the Department of the Interior (August 13, 2026) for Hydrotech ZS long-term deployment modules; and a $151 thousand delivery order from the Army (September 24, 2025) for headquarters sonde requirements under the new IDIQ.

The vendor's NAICS footprint aligns tightly with its capability: Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables (62 awards); Other Electronic and Precision Equipment Repair and Maintenance (9 awards); and Other Measuring and Controlling Device Manufacturing (7 awards). PSC codes cluster on Combination And Miscellaneous Instruments (35 awards) and Maint/Repair/Rebuild Of Equipment—Instruments And Laboratory Equipment (11 awards). Hydrotech ZS Consulting competes full-and-open; recent awards show no set-aside designations, though one August 2026 USGS purchase order carries a Total Small Business set-aside.

Water Quality Monitoring Equipment manufacturing and Sale