Alert levels should be tailored to local context and agreed upon by a multi-stakeholder group. Before deciding on the thresholds for levels, you should ensure you are able to capture data regularly and be able to analyze and share it consistently. Below is an example of an alert-level system with indicators and thresholds for USA.

Link:

//preventepidemics.org/wp-content/uploads/2020/05/Annex-2_Example-of-an-alert-level-system_US_FINAL.pdf