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Assessment Phase

The Assessment Phase involves understanding where each public water system’s source water comes from, what contaminant sources potentially threaten the water source(s), and how susceptible each water source is to potential contamination. Since many water systems obtain their water from multiple sources, the susceptibility of a public water system is analyzed by examining the susceptibility of each of its water sources. The susceptibility of an individual water source is analyzed by examining the properties of its physical setting and potential contaminant source threats. The results of the susceptibility analysis calculations are used to report an estimate of how susceptible each water source is to potential contamination.

The source water assessment report provides a screening-level evaluation of the likelihood that a potential contamination problem could occur rather that an indication that a potential contamination problem has or will occur. The results are NOT a reflection of the current quality of the untreated source water, nor are they a reflection of the quality of the treated drinking water that is supplied to the public. In addition, it should be noted that the assessment results are provided as a “starting point” for public water systems to evaluate their individual systems potential contaminant risks. The public water systems have identified some data inconsistencies and are encouraged to address “their” priority contaminant concerns through a source water protection planning effort.

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