UV Disinfection for Municipal Drinking Water

Protecting Public Health

Disinfection is the final, critical step in the treatment of drinking water. If untreated and ingested, drinking water containing harmful bacteria, viruses and protozoa can cause severe, even fatal, health conditions.

UV disinfection helps to provide water confidence to the full range of public water systems, from large municipalities to very small drinking water systems around the world. UV is often paired with chlorine in drinking water applications, enabling robust, multi-barrier protection.

In fact, by utilizing UV as the primary disinfectant, the required chlorine chemical CT (concentration x time) may potentially be reduced.

UV Applications for Municipal Drinking Water

TrojanUVSwift Installation

How UV Light Disinfects Drinking Water

UV light provides rapid, effective inactivation of microorganisms through a physical process. When bacteria, viruses and protozoa are exposed to the germicidal wavelengths of UV light, they are rendered incapable of reproducing and infecting.

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UV Systems for Public Drinking Water

TrojanUV and VIQUA systems are installed and trusted in public water systems around the world, including:

  • Any size community water system, including major municipalities like New York City
  • Non-community water systems (with their own water supply) such as:
    • Offices, schools, hospitals, churches, campgrounds, B&Bs, golf courses, gas stations

Find out how our disinfection expertise can help your drinking water treatment plant meet evolving regulations.

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Series of VIQUA Pro UV units certified to NSF 55 Class A used in small drinking water system.

A photo of a TrojanUVFlex 100 Series chamber


The TrojanUVFlex® is designed with features to make installation and operation simpler, faster and more cost-effective than ever before. Built on the proven TrojanUV Solo Lamp® Technology platform, TrojanUVFlex allows for energy-efficient high-intensity delivery of UV light in an extremely compact footprint.

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A photo of a TrojanUVSwift chamber


Engineered and built for dependable performance, the TrojanUVSwift® requires a minimal number of lamps to treat a given flow and is serviceable from one side for easy maintenance. It also incorporates innovative features to reduce operation and maintenance costs, including variable output lamp drivers and our revolutionary ActiClean® automatic sleeve wiping system.

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A photo of a TrojanUVSwiftSC chamber


The TrojanUVSwift®SC is designed to treat flow rates of 20 gallons per minute (GPM) to 16 million gallons per day (MGD) or 4.5 to 2,525 m3/hr. These compact UV systems offer small communities an economical solution for drinking water disinfection.

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VIQUA PRO10 UV disinfection system


The VIQUA PRO Series is suited to regulated environments, like very small community drinking water systems, transient and non-transient community drinking water systems that demand certified disinfection systems.

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Multi-barrier Strategy Using UV Disinfection

Stringent regulations, such as the USEPA Long Term 2 Enhanced Surface Water Treatment Rule (requiring the treatment of Cryptosporidium) and the Ground Water Rule in the U.S., often necessitate the use of UV to supplement existing disinfection systems. This strategy is known as multi-barrier protection.

A UV disinfection system is an ideal addition to a drinking water treatment plant’s multi-barrier strategy. It doesn’t create disinfection by-products or impact the taste or odor of the water, and it’s easily integrated into existing treatment processes because it does not alter nor is it affected by water chemistry (e.g., pH).

The combined range of effectiveness when UV and chlorine are used together to disinfect drinking water

In a multi-barrier strategy, UV is most often paired with chlorine disinfection. UV and chlorine naturally complement each other, as UV is effective against Cryptosporidium (a chlorine-resistant protozoa).

UV is a viable disinfection solution that can be retrofitted into existing drinking water treatment plants systems. The contact time required for the UV disinfection process is mere seconds, so the footprint required is relatively small – this ultimately reduces the need for large contact tanks.

The World’s Largest UV Drinking Water Facility

Public water systems around the world – from rural wells to municipalities serving millions of people – have installed UV disinfection systems to help treat their water.

New York City is home to the world’s largest UV drinking water facility. There are 56 custom-designed TrojanUV systems installed there and each of them is capable of delivering a 40 mJ/cm2 dose to 40 million gallons of water per day.

A aerial photo of New York City skyline and port

The disinfection requirement, set by the NYC Department of Environmental Protection, allows for the delivery of greater than 3-log reduction of Cryptosporidium and Giardia. All told, the facility has the capacity to treat 2.02 billion gallons of water per day.

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Treating Environmental Contaminants in Drinking Water

Increasingly, drinking water supplies are being impacted by the presence of chemical contaminants. Pesticides, nitrosamines such as N-nitrosodimethylamine (NDMA), and other micropollutants have all been found in both groundwater and surface waters that act as drinking water supplies.

Fortunately, the UV advanced oxidation process (also known as UV AOP) destroys chemical contaminants in water. TrojanUV advanced oxidation systems have been installed around the world to treat and remediate a variety of environmental contaminants.

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