The dataset

ECHO's download is free at the EPA. What is sold is the normalization and the identifier index.

What is added

• Every identifier resolved — 3,667,814 program identifiers (EPA ID, NPDES, air, drinking water, TRI, greenhouse gas) mapped to their facility, where ECHO stores them as space-separated lists.
• Duplicates resolved — 52,297 repeated registry rows merged, keeping the most complete.
• NAICS labels attached — ECHO publishes codes only.

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