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Figure 1. Toolbox Flow Chart showing a sequence of events in three boxes. Box 1: Before an Event - interagency communication, communication planning, and testing. Box 2: During an Event - Initiate an advisory, execute procedures, and end edvisory. Box 3: After an Event - Debrief event, evaluate procedures, and adjust procedures. The cycle of events returns to the first box with an arrow.

Figure 1: Toolbox Flow Chart. Shows the process for preparing for, issuing, and following up after a drinking water advisory.

Figure 2: Range of Situations for Drinking Water Advisories. From left to right, arrows demonstrating severity from lesser to greater flow across four boxes. A second arrow flows across boxes 2 through 4 indicating the public is to take immediate action. Box 1: Informational - an occasional situation. Used for a wide range of purposes, including 1) Failure to meet drinking water standards with non-acute endpoints or administrative requirements; 2) Efforts to build rapport with customers, 3) Customer education to increase preparedness for emergencies; 4) Water conservation messaging. Box 2: Boil Water - a frequent situation. Used for potential or demonstrated microbial contamination: 1) Low/loss of pressure; 2) Tier 1 microbial violation (e.g., high turbidity, positive E. Coli); 3) Natural disasters (e.g., flooding, hurricanes); 4) Vandalism. Box 3: Do Not Drink - an Infrequent situation. Used for potential or demonstrated contamination that could cause acute health effects: 1) Nitrite/nitrate MCL violation; 2) Chemical overfeed into the water supply. Box 4: Do Not Use - a rare situation. Used with caution due to risk associated with lack of sanitation and fire protection: 1) Microbial, chemical, or radiological contamination in which any contact is hazardous to public health; 2) Error in treatment leading to water with a high or low pH that could lead to chemical burns.

Figure 2: Range of Situations for Drinking Water Advisories. Note: These are examples of potential reasons to issue an advisory; this is not intended to be a comprehensive list. Consult your primacy agency for more information.

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Figure 3. Layers of outreach. Comprised of concentric rings of different colors, representing, from inside to outside The center circle indicates the Water System itself. Next, in white, is Ring 1: the Primacy Agency. Outside this, in light green, is Ring 2 containing Public Health/Primacy Agencies, Public Safety, Public Works, Schools, Emergency Management, Local Elected and Appointed Government Officials, Other Government Agencies, Consecutive Water Systems, Adjacent Jurisdictions, and Social Services. Outside this, in dark green, is Ring 3: Susceptible Populations, Community-based Organizations, Faith-based Organizations, Critical and Priority Customers, and Nongovernmental Organizations.

Figure 3: Layers of Outreach. Shows how creating a local network can extend an agency’s outreach capacity.

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Figure 4: Issuing a Drinking Water Advisory Flow Chart. The Primacy Agency and the Water System can go through the following steps. 1) Advisory Triggered; 2) Assess Scope, scale, severity; 3) Identify geographical boundaries and notify partners; 4) Notify and coordinate with consecutive, wholesale, and neighboring systems, local jurisdictions, and other partners; 5) Develop messages; 6) Identify communication responsibilities; 7) Coordinate, execute communication to affected agencies and jurisdictions and brief elected and public officials; 8)Issue Advisory; 9)Assess and monitor; 10) Determine if the situation is corrected; 11) End advisor; 12) Evaluate

Figure 4: Issuing a Drinking Water Advisory Flow Chart.

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Figure 5: Example of a Simple Map to Designate an Area Affected. A street map showing in the affected neighborhoods and streets with a red overlay. Displays how widespread the affected area is geographically.

Figure 5: Example of a Simple Map to Designate an Area Affected
by a Drinking Water Advisory

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