Curated, provenance-linked NPDES permit register

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Curated, provenance-linked NPDES permit register — 398,004 Clean Water Act discharge permits with holder, place, receiving water, watershed reached, permitted operation class and current permit standing, each figure carrying the source filing it came from. Sold in three forms: a dated single-state bound report, a monthly change-alert subscription, and a licensed register delivered as files plus an interface with refreshes across the term. The genuinely ownable layer is not the permit list itself but the harmonisation and change history: watershed linkage, normalised operation classes, and the time-series of permit-standing changes captured at each refresh, which the free federal register does not present