Boundaries
A key component of a drinking water advisory is to communicate clearly the area affected. Many customers do not know which water system provides their service and broadcast media usually reach a large audience beyond the affected area.
Clearly describe the boundaries of the affected area using street names, place names, building identification information (e.g., building numbers, unit numbers, wings, etc.) and well known reference points.
Maps
Maps help illustrate the affected area. Water systems can generate maps using internal or online mapping tools (e.g., geographic information system [GIS]). These maps can be posted on agency websites, or distributed electronically or as printed material. Update the map as the situation changes.
Figure 5: Example of a Simple Map to Designate an Area Affected by a Drinking Water Advisory
