"Reasonable potential analysis"

Permit writers must perform a “reasonable potential analysis” to determine which pollutants in the discharge have a reasonable potential to violate water quality standards. Limits must be included in the permit for those pollutants that do have a reasonable potential to violate standards.

“Limitations must control all pollutants …which the Director determines are or may be discharged at a level which will cause, have the reasonable potential to cause, or contribute to an excursion above any State water quality standard, including State narrative criteria for water quality.”

(40CFR122.44(d)(1)(i))

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