Oil & Gas Water Treatment Companies

Litree: Pioneering Ultrafiltration for a Water-Secure World Founded in 1992, Litree has dedicated 30+ years to redefining water purification through ultrafiltration (UF) membrane technology—our core expertise and passion立升（Litree）. As a global high-tech enterprise rooted in independent innovation, we’ve evolved from a membrane R&D startup to one of the world’s leading water problem solvers, with over 146 core patents and state-of-the-art manufacturing hubs in Haikou and Suzhou, China立升（Litree）. Our signature hollow fiber UF membranes are engineered to deliver unmatched performance: 0.01μm precision removes 99.99% of bacteria, viruses, and contaminants while preserving essential minerals—striking the perfect balance between purity and health立升（Litree）. This technology powers our diverse solutions, from residential whole-house systems to large-scale municipal projects and industrial wastewater treatment, all designed for sustainability and cost-efficiency. What truly sets us apart is our commitment to making safe water accessible. We’ve completed projects serving 50,000+ residents with centralized purification systems that cut construction costs and footprint by 50% compared to traditional setups—proof that advanced technology can also be affordable. Today, our solutions reach 60+ countries, supporting 3,000+ industrial clients and millions of households worldwide. At Litree, water isn’t just our business—it’s our mission. We believe every drop matters, and we’ll keep pushing boundaries to create a future where clean, safe water is a universal right, not a privilege

Founded in 2009, formerly known as Red Circle Industries (RCI), RCI Aquatech creates custom wastewater solutions based on end users’ requirements, which allow for optimally chosen components resulting in a solution that meets or exceeds customer needs. RCI Aquatech’s wastewater treatment systems combine necessary process technologies to reach required state and federal discharge limits and comply with local regulations. Our systems focus on removal of pollutants such as heavy metals, greases, suspended solids, oils, high salt content, toxic compounds, phosphates and more. Using chemical-physical treatment (coagulation, flocculation, and sedimentation), biological treatment (aerobic and anaerobic) and wet chemical oxidation (persistent or toxic organics). Our expertise comprises the following technologies:  Filtration & softening systems  Physicochemical treatment (coagulation-flocculation)  Membrane filtration (UF & RO)  Ion exchange  Chemical oxidation  Biological treatment  Zero liquid discharge (ZLD) system

SAVE WATER, SAVE OUR PLANET! With climate change and a growing population, saving drinking water is more important than ever. 20% of our drinking water is used to flush the toilet, and therefore biocompact helps companies, governments and non-profit organisations to save drinking water in the sanitary room.

EC Solutions is a specialized consultancy focused on electrochemical technologies for water and wastewater treatment. We believe electrochemical processes, and electrocoagulation in particular, are among the most promising technologies in the water sector today. As a rule of thumb, anything that can be treated with conventional coagulation–flocculation can be pretreated with electrocoagulation, without adding chemicals. That means less chemical handling, lower sludge complexity, and more controllable treatment outcomes. We help industries evaluate, pilot, and implement electrocoagulation as a robust pretreatment or core process for color removal, heavy metals, TSS, emulsified oils, and complex industrial effluents. If you’re dealing with a difficult water challenge and want a cleaner, smarter alternative to chemical treatment, EC Solutions is built for that.

VA Tech Wabag Limited, headquartered in Chennai, India, is a global water technology multinational with over a century of heritage, operating across 25 countries on three continents. It provides EPC and O&M of drinking water, desalination, industrial water, and wastewater treatment plants for municipalities and sectors including oil and gas, power, and steel. Wabag deploys seawater reverse osmosis, aerobic granular biomass, forward osmosis, and Zero Liquid Discharge across large-scale water infrastructure projects.

Pall Corporation is a global supplier of filtration, separation, and purification solutions, addressing complex fluid and gas processing challenges across a broad range of industries. Founded in 1946 and headquartered in Port Washington, New York, the company is now part of Danaher Corporation. Pall serves aerospace and defense, chemicals and polymers, food and beverage, microelectronics, oil and gas, and power generation markets. Its industrial water and process offerings include membrane filtration systems, microfiltration, and ceramic membrane technology used to remove contaminants and protect downstream equipment. The company engineers both single-use and system-scale filtration products for high-purity and high-flow applications.

LiqTech International, headquartered in Ballerup, Denmark and listed on Nasdaq, develops advanced membrane filtration technology for purifying liquids and gases. It specializes in oil and gas produced water treatment, marine scrubber water cleaning, and industrial wastewater using proprietary silicon carbide ceramic membranes in crossflow systems. LiqTech has installed more than 280 water treatment systems globally, including produced water pilot units delivered to operators in the Middle East.

BI Pure Water designs and manufactures custom industrial and municipal water treatment plants, with over 30 years of experience serving municipalities, mining, oil and gas, pharmaceutical, and agricultural sectors. The company offers turnkey systems including mobile, trailer-based emergency potable water units deployed during disasters, as well as engineered modular fire pump plants. Based in Surrey, British Columbia, it delivers complete custom treatment solutions from design through manufacturing.

H2O Inc. is a water and waste systems manufacturer headquartered in Lafayette, Louisiana, designing and building water treatment solutions for demanding marine and offshore environments. The company specializes in systems for offshore oil and gas platforms, FPSOs, and commercial vessels, including freshwater desalination, marine sanitation devices, biofouling control, and bilge water treatment. With more than 3,000 systems installed globally, H2O Inc. supplies certified equipment and provides equipment rentals along with 24/7 technical support and field service.

Ecosphere Technologies, operating as Brisben Water, develops patented technologies for industrial water treatment and wastewater recycling, with a focus on scale inhibition and corrosion control. The company uses advanced oxidation processes to recycle and reuse wastewater across oil and gas, mining, agriculture, and municipal sectors, and also addresses bacteria control and cooling and boiler water treatment. Headquartered in Hobe Sound, Florida, it has processed billions of gallons of wastewater in oil and gas operations.

Select Water Solutions is a United States water management and fluid chemistry company serving the oil and gas industry, with deep operations in the Permian Basin. It specializes in produced water recycling, treatment, transfer and disposal, building and operating water infrastructure networks and providing chemical completions, automation and sustainability consulting for upstream operators.

ALAR Corp manufactures industrial wastewater treatment systems addressing compliance, hauling costs, and regulatory requirements. The company designs and builds equipment for diverse industries including food and beverage, concrete, surface finishing, and oily wastewater applications.

IER Solutions is a water and wastewater treatment chemical and equipment supplier headquartered in Spokane, Washington, with additional plants in Iowa, Texas, and Washington. Owned by Australian company Calix, IER provides safe, earth-friendly alternatives to caustic soda for pH neutralization, along with on-site technical services for alkalinity control, odor and corrosion control, hydrogen sulfide sequestration, phosphorus removal, sludge compaction, and biogas waste management. The company serves food and beverage, meat and dairy processing, municipal wastewater, winery and brewery, and microelectronics industries with its magnesium hydroxide based product lines.

Sodai is a Milan, Italy environmental engineering company with more than 30 years of experience in purifying and treating primary waters and industrial process fluids. It designs and operates tailor-made and standard plants for desalination, potabilization, purification, oily water treatment, water reuse and zero liquid discharge, serving Oil, Gas and Power clients including operating centers for ENI and ENEL. The company works across 28 countries and holds ISO 9001, ISO 14001 and ISO 45001 certification.

Gradiant is an industrial water treatment solutions and technology company headquartered in Woburn, Massachusetts, United States, founded at MIT in 2013 with over 1,300 employees worldwide. The company provides complete, site-wide solutions that combine proprietary technology, engineering, and customized chemicals to help industries reduce freshwater use, reclaim valuable resources, and renew wastewater into freshwater. Gradiant specializes in minimum and zero liquid discharge, ultrapure water, PFAS and emerging-contaminant removal, and resource recovery for sectors including semiconductors, pharmaceuticals, food and beverage, and lithium and critical minerals.

Filtrex S.r.l. is a leading Italian company specializing in advanced filtration technologies for various industries, including petroleum, marine, and industrial applications. With over 40 years of expertise, Filtrex provides innovative solutions for water, lube oil, and hydrocarbon filtration, serving global markets with high-quality equipment and systems.

ChemTreat is one of the largest industrial water treatment companies in the United States, headquartered in Richmond, Virginia. It designs custom chemical treatment programs for boiler water, cooling water, pretreatment, wastewater and water reuse, combining field technical support, laboratory services and digital monitoring to improve efficiency and protect equipment across many industries.