Legal Standard Clean Water Act (33 U.S.C. § 1362) & 40 CFR § 171

Statutory Definition:

Contamination originating from a single, discrete, and identifiable location, such as an uncontained mixing/loading spill pad, leaking storage drum, or direct back-siphon into a wellhead.

Practical Exam Application:

Contrasts with non-point source pollution (diffuse area runoff). Prevented through impermeable secondary containment berms and backflow check valves.

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