Example of Factors Involved in the Calculation of Safe Harbor Levels under California Proposition 65

Question Posed:

How do we calculate safe harbor levels under the Safe Drinking Water and Toxic Enforcement Act of 1986 (Proposition 65)?

Answer Provided:

There are many factors that determine safe harbor levels in a product. If we were to use an example of a part that carries the risk of skin exposure, factors to consider in determining the safe harbor level are:

  • The concentration of the substance
  • The number of times in a day skin contact is made, and length of skin contact with the product
  • The surface area of the skin contact
  • The dermal uptake/absorption rate
  • The weight of the product user


Reference (BPA as an Example): https://oehha.ca.gov/media/downloads/crnr/03172016dermalbpamadlisor.pdf


**Article Contents Valid as of 2019-03-18

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