Our solutions produce approximately 18 billion gallons of treated water per year

Seven Seas Water Group delivers abundant, safe, and reliable high-purity drinking water to communities in need and some of the most demanding industries around the world. We are committed to solving water challenges through our repertoire of advanced technical solutions.

The Seven Seas lineage stretches back to the origins of reverse osmosis desalination more than 60 years ago. As the company evolved, a majority of its senior management and engineers arrived with the acquisition of Ionics, which has designed and built more than 1,000 seawater reverse osmosis (SWRO) desalination plants, including the largest in the Western Hemisphere.

Seven Seas owns and operates the plants it builds and updates, and is responsible for long-term contracts. That means a business model founded on quality design, construction, and equipment, one that delivers reliable water services with an appreciation for continuing relationships.

Delivering Reliable Service Using Proven Water Treatment Technologies

Seven Seas Water Group owns and operates more than 100 plants worldwide with a consistent average of 97% plant availability, which is made possible by the most reliable technologies in the business:

  • Seawater reverse osmosis (SWRO) desalination.
  • Brackish water reverse osmosis (BWRO) desalination.
  • Reverse osmosis (RO) water purification.
  • Multimedia filtration.
  • Gravity filtration.

Featured Water Treatment Case Studies

Point Fortin, Trinidad

Seven Seas Water Group overcame obstacles to fast-track a 6.7 MGD (25,379 m3/d) desalination plant on a 1.2-acre site in just 14 months after receiving permits. The plant transforms high TDS/TSS feedwater into a reliable municipal supply of fresh water while protecting a sensitive marine ecosystem. The BOO financing model allowed project delivery with no upfront capital investment.

Read the case study.

Limetree Bay Terminal, USVI

In the U.S. Virgin Islands, one of the world’s largest petroleum refineries needed 650,000 GPD (2,460 m3/d) of industrial-quality water on an emergency basis. Seven Seas Water Group constructed a two-pass solution consisting of three mobile seawater reverse osmosis (SWRO) units and one land-based brackish water reverse osmosis (BWRO) unit to deliver the requested capacity ahead of schedule — only 67 days — with no capital investment. The plant exceeds the required quality specifications and has been operating continuously since startup.

Read the case study.

Great Exuma, Bahamas

The Sandals Emerald Bay resort needed relief from the operations and maintenance requirements of its aging, inefficient, and unreliable desalination plant. Seven Seas Water Group acquired the plant and an existing BOOT agreement, upgraded the infrastructure, and began reliably delivering 1 MGD (3,780 m3/d) of fresh water with reverse osmosis desalination. Seven Seas also operates a wastewater reuse system to irrigate the resort’s golf course. Sandals opted to renew the long-term BOOT contract rather than taking possession, satisfied with Seven Seas Water’s long-term commitment to its clients.

Read the case study.


With Water-as-a-Service®, Seven Seas Water Group takes on all the business of water and wastewater treatment with no upfront investment, charging clients only for water delivered. We offer variable-year arrangements and can buy existing infrastructure. And, equipment can be scaled up or down to meet changing demand.

Learn more about our turnkey water and wastewater solutions.

Lease Plant Program

Looking for smaller treatment capacities or a lease arrangement? We also offer the option to lease water and wastewater treatment plants or use the design-build or design-build-finance models.

Learn more about lease options.