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📉 Where Did Stormwater Benchmarks Come From? The Surprising Origin Story

In this revealing clip, we break down how the EPA established stormwater benchmark levels — and why the science behind them might not be as solid as many assume.

The EPA relied on a 1992 study on urban runoff, pulling the lowest reported pollutant concentrations to create national benchmark standards. But here’s the twist:
👉 The study itself stated the data wasn’t strong enough to form conclusions.
👉 Those same numbers still became the foundation for stormwater regulations nationwide.

💡 What You’ll Learn

How the EPA selected benchmark pollutant levels

Why outdated and limited data ended up shaping modern regulations

The role of the 1992 urban runoff study

How benchmark values influence stormwater compliance today

🌧️ Why It Matters

Understanding where benchmarks came from helps explain why some regulatory limits feel disconnected from real-world stormwater conditions — and why the industry continues to challenge and refine these standards.