In step 3, risk and system assessment, you analysed the conditions that determine the risk of mass developments of cyanobateria and/or their break-through into drinking-water systems, including the efficacy of existing control measures. This assessment, its reasons and its uncertainties should be documented.

Columns 1-6 of the table below (marked red) are suggested as format for a summary documentation of your assessment (use the worksheet provided for your own documentation). More extensive documentation may be adequate and should be developed as needed. In particular, it is useful to describe in more detail the rationale for your assessment.

Column 7 will be used later (it is proposed as format for a summary of your next step – defining control measures).

Before finishing your risk assessment, it is worthwhile to estimate how this risk relates to the health risks caused by other hazards which occur in your water supply or recreational setting. This is important for setting priorities when deciding on measures to improve the protection of public health.

Summary documentation of step 3 – assessing risk and system performance						Summary documentation of step 4 – defining control measures
Cyanotoxin hazard	Risk and reasons for assessment	Uncertainty of assessment	Existing control measures	Remaining risk and reasons for assessment	Uncertainty of assessment	Next steps: new or upgraded control measures, filling information gaps
Examples for filling in this table						· … · … · … · ·

è Back to START

è On to comparing the health risk from cyanotoxins to the risk from other hazards in your water supply or recreational setting