Pennsylvania Code
Title 25 - ENVIRONMENTAL PROTECTION
Part I - Department of Environmental Protection
Subpart A - Preliminary Provisions
Article II - Statements of Policy
Chapter 16 - WATER QUALITY TOXICS MANAGEMENT STRATEGY-STATEMENT OF POLICY
Subchapter A - GUIDELINES FOR DEVELOPMENT OF CRITERIA FOR TOXIC SUBSTANCES AND WATER QUALITY CRITERIA FOR TOXIC SUBSTANCES
GUIDELINES FOR DEVELOPMENT OF HUMAN HEALTH-BASED CRITERIA
Section 16.31 - Application
Universal Citation: 25 PA Code § 16.31
Current through Register Vol. 54, No. 52, December 28, 2024
In the development of water quality criteria for human health protection, the principles of risk assessment and risk management are applied in two distinct ways depending upon the toxic effect to be protected against. Traditional toxicology is developed upon a theory that the "dose determines the poison" (any substance is toxic if the dose becomes large enough). It is generally recognized, however, that for most substances there is a safe level below which no adverse effects will be seen. This "threshold level" approach is in contrast to the "no threshold level" approach generally ascribed to carcinogens.
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