Zone 2 - the 5 year horizontal time of travel boundary

The entire area within the 5-year TOT boundary defines Zone 2. This zone should be actively managed for control of potential chemical contaminants. While any significant chemical release within Zone 1 has the potential to contaminate the drinking water supply and render it unusable, the area lying between the 1 and 5-year time of travel boundaries also needs to be carefully managed to protect future water supplies.

The primary difference between potential contaminant sources in Zones 1 and 2 is that release in Zone 2 provides more time for response (less of an acute crisis situation). All potential contaminant sources should be identified and controlled, with an emphasis on pollution prevention and risk reduction management. Both the 1-year and the 5-year zones are used by many state and local agencies as a prioritizing tool for directing technical assistance, outreach programs, and for targeting inspections and enforcement actions.

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