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List of Tier 3 Waters for the Pesticide General Permit

EPA’s Pesticide General Permit has special requirements for discharges to waters designated by a State or Tribe as Tier 3 (Outstanding National Resource Waters) for antidegradation purposes under 40 CFR 131.12(a)(3). See Part 1.1.2.2 of the permit and fact sheet.

The list below is provided as a resource for Operators who must determine whether they discharge to a Tier 3 water. Only Tier 3 waters specifically identified by a water quality standard authority (e.g., a State, Territory, or Tribe) are identified in the table below. Many authorities evaluate the existing and protected quality of the receiving water on a pollutant-by-pollutant basis and determine whether water quality is better than the applicable criteria that would be affected by a new discharge or an increase in an existing discharge of the pollutant. In instances where water quality is better, the authority may choose to allow lower water quality, where lower water quality is determined to be necessary to support important social and economic development. Permittees are not required to identify those waters which are evaluated on an individual basis.

Click here (PDF) (10 pp, 121K) to view the List of Tier 3 waters.

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Last updated on October 31, 2011 5:07 PM
URL:http://cfpub2.epa.gov/npdes/pesticides/antideg.cfm