3D rendering of a pathogenic virus

Virus Barrier

TrojanUV systems can be utilized as a primary disinfection barrier to adenovirus at drinking water plants treating both surface water and groundwater

About Viruses

  • There are a variety of viruses that may be present in water that, if not treated, may present a health risk to consumers
  • Examples include adenovirus, rotavirus, poliovirus, and coxsackievirus
  • Health effects from different viruses vary – the most common is gastrointestinal illness, however, depending on the specific type of virus, severe flu-like symptoms, meningitis, pneumonia, or other non-specific febrile illnesses have been observed

The United States Environmental Protection Agency’s Long Term 2 Enhanced Surface Water Treatment Rule (LT2) defined UV dose requirements for inactivation of viruses based on a relatively resistant virus: adenovirus.

The UV dose required to accomplish a 4-log (99.99%) inactivation of viruses is 186 mJ/cm2, as seen in the USEPA UV Disinfection Guidance Manual. The LT2 Rule requires 4-log virus treatment for public water systems using surface water and groundwater under direct influence (GUDI) of surface water.

Furthermore, the USEPA’s Ground Water Rule requires that non-GUDI groundwater systems also provide 4-log inactivation of viruses if fecal indicators are detected during monitoring. However, some regions mandate 4-log virus treatment regardless of monitoring results.

UV in Action


4-log Virus Treatment in Abington, Pennsylvania 

In Pennsylvania, the Department of Environmental Protection mandated all groundwater providers obtain 4-log virus treatment credits regardless of monitoring results from their wells under the Ground Water Rule (GWR). Affected facilities needing to enhance their disinfection practices often do so with modified chlorine dosing. However, the Hall Road Well Station was a unique installation in that its existing chlorine dose capabilities would have required an impractical amount of additional pipe in order to establish the necessary disinfection contact time. UV technology, on the other hand, provided a favorable lower footprint alternative.

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Case study about the TrojanUVSwiftSC installation at the Hall Road Well Station in Pennsylvania that provides 4-log virus disinfection for groundwater extraction and treatment

Systems for Virus Barrier

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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The TrojanUVSwift® is a testament to our commitment to providing water confidence. It boasts comprehensive validation at a wide range of flow rates and UV transmittance levels in full compliance with the protocols of the United States Environmental Protection Agency UV Disinfection Guidance Manual.

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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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