UV Water Treatment - Virus Barrier

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, but the most common health effect is gastrointestinal illness. In some cases, depending on the specific virus, severe flu-like symptoms, meningitis, pneumonia, or other non-specific febrile illnesses have been observed. Small children are particularly susceptible to virus infection.

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. Further, the USEPA’s Groundwater 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.

» Download the Let's Talk Adenovirus Brochure

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