Causes for modification of permits

Any NPDES permit (including a “general permit” that applies to many similar dischargers) may be re-opened for modification (1) if there are significant alterations to the permitted facilities, (2) if new information about the effects of the permitted discharge (including cumulative effects) have become available or (3) if any regulations upon which the permit was based have been changed or superseded.

(40CFR122.62(a))

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