1,340 records

At what quantity does this chemical have to be reported to the EPA?

Across 1,340 records covering 1,339 substances, CERCLA RQ (lbs) runs from 1 (161 substances) to 5000 (159 substances), and 100 is the most common — 309 of them. Every value is transcribed from the source that states it and carries the sentence it was taken from: 2 sources across 1 site, last checked 2026-09-16, due for re-check by 2027-09-01. Every record has a page of its own, quoting the line that states it.

About this data

Cross-program comparison of the two federal reporting thresholds this dataset carries for hazardous chemicals: the CERCLA reportable quantity from 40 CFR 302.4, which triggers release reporting to the National Response Center, and the EPCRA Section 302 threshold planning quantity and Section 304 reportable quantity from 40 CFR 355 Appendix A, which trigger emergency planning and release notification. A chemical on both lists carries both numbers side by side — chlorine's CERCLA reportable quantity is 10 lb and its EPCRA threshold planning quantity is 100 lb — and a chemical on only one list carries only that programme's number. Answers 'what is the reportable quantity for [chemical]' and 'is [chemical] an extremely hazardous substance under EPCRA'. Two further programmes are named in the source list and are not carried here yet, so no record shows them: the Clean Air Act Section 112(r) threshold quantity (40 CFR 68.130, the risk management plan rule) and the lowered EPCRA Section 313 reporting thresholds for chemicals of special concern (40 CFR 372.28). Section 313's ordinary reporting threshold is deliberately not a field here: 40 CFR 372.25 sets it programme-wide at 25,000 lb manufactured or processed and 10,000 lb otherwise used, so it is the same number for every chemical. Only the lowered thresholds in 40 CFR 372.28 vary by chemical.

The data

Showing the first 400 of 1,340 records. Every record has its own page, with its source and the quoted line that states it; these list the rest.

• Records 1–4001,1,1,2-Tetrachloroethane … Bromine
• Records 401–800Bromoacetone … Isopropylmethyl-pyrazolyl Dimethylcarbamate
• Records 801–1,200Isosafrole … Strychnine
• Records 1,201–1,340Strychnine, & salts … Zirconium tetrachloride

Where this came from

Every record above links the page it was taken from and quotes the sentence that states it. These are the 2 sources this dataset was assembled from.

• ecfr.govhttps://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-302/section-302.4
• ecfr.govhttps://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-355

Machine-readable

• data.jsonThe whole dataset — every record with its source URL and source quote.
• Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
• data.csvThe same records as one flat table, for a spreadsheet or a dataframe. The last four columns are the source URL, the quoted sentence it was read from, the date we last checked it, and which columns are our reading rather than the page's words.
• How this is made and checkedWhat "verified against source" does and does not mean.

From your own code

Same records, same quotes, without scraping the page: refsource is on PyPI and npm. Each value comes back carrying the URL it was read from and the sentence on that page that states it — .source and .quote sit on the value itself rather than in a side channel, so the checking step is available instead of skipped.

pip install refsource
refsource lookup chemical-regulatory-reporting-thresholds substance=1,1,1,2-Tetrachloroethane

npx -y refsource lookup chemical-regulatory-reporting-thresholds substance=1,1,1,2-Tetrachloroethane

Set your AI assistant up to use this

Two files and no account. Put this in .mcp.json at the root of your project — Claude Code, Cursor, Windsurf, VS Code and Codex all read that file — and your assistant can look this dataset up instead of recalling it. The server is remote, keyless and read-only.

{
  "mcpServers": {
    "referencesource": {
      "type": "http",
      "url": "https://referencesource.org/mcp"
    }
  }
}

Add to Cursor · or, on the command line: claude mcp add --transport http referencesource https://referencesource.org/mcp --scope project

Then one line in the project's CLAUDE.md or AGENTS.md, so the assistant knows when to reach for it:

When a question needs "US federal chemical regulatory reporting thresholds by program (CERCLA and EPCRA)", call the referencesource MCP server at https://referencesource.org/mcp (tool `search_records`, dataset_slug `chemical-regulatory-reporting-thresholds`) instead of answering from memory — every record it returns carries its source URL and a verbatim quote from that page.

What each tool does, and the servers built over single registers: Connect your AI assistant.

1,340 records. last verified against source 2026-09-16. due for re-check by 2027-09-01.

Licence. US government work — public domain. All values from 40 CFR 302.4, 40 CFR 355, 40 CFR 68.130 and 40 CFR 372.28, published by EPA in the eCFR.