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Combined Sewer Overfalls (CSO's) are a safety valve in the treatment of human waste that can when operated in the area of bivalve mollusc harvesting. Text alerts of activation of CSO's direct to harvesters are now being trialled in the UK. This document describes the factors that can be considered by a harvester when carrying out a risk assessment. Knowledge of these factors affects when text alerts are received will result in enhanced active management decisions.