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.
Delivered as CSV or Parquet, with a data dictionary. Ask on the Pro page.