Lifetime Exposure: Total amount of exposure to a substance that a human would receive in a lifetime (usually assumed to be 70 years).
The sum of lifetime exposure to radon working levels expressed in total working level months.
Curb Stop
A water service shutoff valve located in a water service pipe near the curb and between the water main and the building.
Unit Risk Number: The number of potential excess cancer cases from a lifetime exposure to one microgram per cubic meter (µ/m3) of a given substance. For example, a unit risk value of 5.5x10-6 would indicate an estimated 5.
Cancer risk
A theoretical risk for getting cancer if exposed to a substance every day for 70 years (a lifetime exposure). The true risk might be lower.
Carcinogen
A substance that causes cancer.
Cumulative Working Level Months (CWLM): The sum of lifetime exposure to radon working levels expressed in total working level months.
Health Advisory (HA): non-regulatory, health-based reference level of drinking water contaminants at which adverse health effects are believed to be minimal. HA levels are established for 1-day, 10-day, longer-term, and lifetime exposure periods, ...
 See also: Compounds, Lead, Soil, Exposure, Air
  
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