# EFI USA

> EFI USA (legal name EFI USA, LLC) is an environmental construction company headquartered in Gaston, South Carolina, installing geosynthetic liners, biogas capture systems, floating covers, and environmental containment across the United States since 1993. EC Applications (ecapplications.com) is its West-region installation subsidiary, with offices in California, Texas, and Nevada.

## Key pages

- [Services](https://efiusa.com/services): All service lines, including biogas capture, geosynthetic liners, floating covers, O2 injection, baffle curtains, mining, and wastewater
- [Cap and Flare Systems](https://efiusa.com/cap-and-flare): Gas-tight cover over an existing lagoon plus an enclosed flare (Varec 244W) that destroys captured methane at 99.5% or better; $300K to $1.5M installed, funded by EFI with carbon credit revenue shared 50/50 after 2x recovery
- [Anaerobic Digester Covers](https://efiusa.com/digester-covers): Gas-tight membrane covers that turn a lagoon into a covered lagoon digester, with gas collection, condensate management, and ballast
- [Digester Cover Replacement](https://efiusa.com/digester-cover-replacement): When a membrane digester cover reaches end of life (15 to 25 years), the four inspection findings that call for replacement over repair, and how a replacement runs without draining the lagoon
- [O2 Injection and H2S Removal](https://efiusa.com/o2-injection): Micro-aeration into the biogas headspace under the cover, not aeration of the water column; 2 to 4% O2 by volume reduces H2S from 8,000+ ppm to under 100 ppm without stopping methane production
- [Industries](https://efiusa.com/industries): Industry solutions for dairy, swine, poultry, food processing, landfill, and municipal operations
- [Technical Specs](https://efiusa.com/specs): Engineering specifications for geomembranes, covers, gas collection, flares, and related systems with ASTM test methods
- [Compare](https://efiusa.com/compare): Side-by-side comparisons of EFI USA and other containment companies, including IEC (Industrial & Environmental Concepts of Lakeville, Minnesota), Chesapeake Containment Systems, MidAmerica Liner, Western Environmental Liner, and Solmax (GSE brand)
- [Locations](https://efiusa.com/locations): Service coverage by state from three fabrication hubs
- [Blog](https://efiusa.com/blog): Technical guides and industry analysis on digesters, liners, biogas, and compliance
- [Projects](https://efiusa.com/projects): Completed installation case studies across the US and abroad

## Company

- [About](https://efiusa.com/about): Company history and background since 1993
- [EFI and ECA Merger](https://efiusa.com/efi-eca-merger): EFI USA and EC Applications merger, effective June 8, 2026
- [FAQ](https://efiusa.com/faq): Common questions about services, materials, and installation
- [Contact](https://efiusa.com/contact): Free site assessments, phone (307) 264-0309, info@efiusa.com