(SW required level of Inadequate virus inactivation inactivation design or is not achieved by operation the (CT). time the water reaches the first user. The water The system treatment must ensure system > 3 adequate operation and/ inactivation; the logs? or design does disinfection not provide for profiling adequate spreadsheet sent inactivation of to the system Giardia should be used The lamblia. weekly for one SWTR requires year to that water document systems achieve adequate at least 99.9% inactivation. If (3-log) removal the system is and/or unable to inactivation of achieve the Giardia lamblia required 4 log cysts and inactivation by 99.99% (4-log) adjusting the removal and/or flow rate or inactivation of chlorine viruses. As residual, it is documented in possible that this sanitary modifications to survey, the the system filtration system design will be when properly necessary. operated does not achieve the required reduction of Giardia; therefore, the system must achieve additional reduction of Giardia through inactivation. The system does not routinely collect and record the
required level of virus inactivation is not achieved by the time the water reaches the first user. The system must ensure adequate inactivation; the disinfection profiling spreadsheet sent to the system should be used weekly for one year to document adequate inactivation. If the system is unable to achieve the required 4 log inactivation by adjusting the flow rate or chlorine residual, it is possible that modifications to the system design will be necessary. (SW > 3 logs? Inadequate inactivation design or operation (CT). The water treatment system operation and/ or design does not provide for adequate inactivation of Giardia lamblia. The SWTR requires that water systems achieve at least 99.9% (3-log) removal and/or inactivation of Giardia lamblia cysts and 99.99% (4-log) removal and/or inactivation of viruses. As documented in this sanitary survey, the filtration system when properly operated does not achieve the required reduction of Giardia; therefore, the system must achieve additional reduction of Giardia through inactivation. The system does not routinely collect and record the
ss_tribal_form.docx