Carolina Water Specialties LLC

Carolina Water Specialties LLC, doing business as Culligan Of The Piedmont, a for-profit limited liability company based in Powdersville, South Carolina, supplies water treatment equipment, potable water system maintenance and repair services, and operational support to the Department of State as a prime contractor (99% of recent awards). The vendor competes exclusively in full-and-open procurements with no small business set-aside designations across its federal footprint.

The vendor's customer concentration is singular and extreme. The Department of State's Bureau of Overseas Building Operations funds 98 of 120 total awards (81% of all awards by count) for a combined potential value of $3.5 million, representing 88% of the vendor's total potential value across all federal sources. The remaining State Department customer base — the Bureau of African Affairs (12 awards, $343 thousand), the Bureau of East Asian and Pacific Affairs (1 award, $90 thousand), and the Bureau of Near Eastern Affairs (2 awards, $13 thousand) — accounts for the remaining 4% of potential value. The Bureau of Overseas Building Operations' dominance reflects the vendor's strategic positioning as a specialized provider of water treatment infrastructure support at U.S. diplomatic facilities worldwide.

Capability work spans potable and potable-adjacent water treatment systems for overseas posts and select domestic facilities. Representative contracts include a $158.2 million definitive contract with the Bureau of Overseas Building Operations for potable water and HVAC service maintenance at the U.S. Embassy in Benin through May 31, 2027; a $110.6 million definitive contract for portable and potable water system equipment in Paraguay through April 16, 2027; a $102.6 million purchase order for potable and raw water boost pump replacements in Gabon awarded August 7, 2023; a $87.4 million definitive contract for domestic hydronic water systems at the U.S. Embassy in Brazzaville, Republic of the Congo through August 31, 2027; and a $69.8 million purchase order for NEC water treatment replacement parts awarded September 11, 2023. The vendor also supplies spare parts, filters, control panels, and training services for water treatment systems at diplomatic compounds across Indonesia, Greece, Rwanda, Paraguay, Mexico, Uganda, Serbia, Mozambique, Laos, and other overseas locations.

The vendor holds two active indefinite delivery contracts with the Department of State. A single-award IDC valued at $198.97 thousand was awarded September 3, 2025, by the Bureau of African Affairs and runs through September 30, 2031, for potable water treatment services at various diplomatic facilities worldwide. An earlier single-award IDC valued at $90 thousand was awarded September 28, 2022, by the Bureau of East Asian and Pacific Affairs and runs through September 28, 2026, for domestic water treatment systems and services with a focus on Indonesia. Task orders under these IDCs carry ceiling values between $16 thousand and $18 thousand per delivery order.

Activity has been episodic and declining. The vendor recorded 12 awards in 2022, 18 in 2023, 8 in 2024, 12 in 2025, and 4 in the first half of 2026. Twelve awards carrying combined potential value of $699 thousand are scheduled for ultimate completion within the next twenty-four months and therefore face recompete risk. The vendor's subcontract footprint is minimal — a single sub-award is on record, a potable water treatment sub-contract with BL Harbert International LLC for work in Kinshasa, Republic of the Congo, awarded February 13, 2026.

The vendor's category concentration confirms water treatment specialization. The top NAICS codes are Water Supply and Irrigation Systems (53 awards) and Water and Sewer Line and Related Structures Construction (9 awards). The top PSC codes are Water Purification Equipment (30 awards) and Maintenance Of Water Supply Facilities (18 awards). Combined obligated dollars stand at $3.9 million against a potential value ceiling of $4 million, indicating near-complete utilization of awarded contract capacity. The vendor has been registered in the System for Award Management since 2011 and has maintained continuous work with the Bureau of Overseas Building Operations across two decades of diplomatic facility infrastructure support.