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Water: Water Quality Standards Academy

Basic Course: Supplemental Topics - Health (b)

Historical Approach to Human Health Criteria Development: Overview

Human Health Ambient Water Quality Criteria

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Health effects for toxic substances have historically been divided into two categories based on the biological endpoints observed:

  • Nonthreshold effects. Carcinogenic effects that have some effects at all doses (i.e., lack a threshold) and demonstrate a linear response to dose.
  • Threshold effects. Noncancer effects that have a threshold and exhibit acute, subacute, or chronic toxicity.

In a few cases, taste and odor (organoleptic) data have been used to form the basis for nonregulatory human health criteria.

learn-more2

Learn More. Additional information on criteria that has been derived from organoleptic considerations. Proceed to the Learn More Topic. » Note: This link launches a pop-up window.


Disclaimer:
For informational purposes only–Not official statements of EPA policy.

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