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2 plants already have a new or tighter limit for Heptachlor in their permit, taking effect Oct 1, 2027 (4 limits). 0 of them reported a median above that limit between Oct 1, 2025 and Sep 30, 2026. EPA's file of Oct 16, 2026.
| Plant | New limit | Effective | Median, last 12 months | × limit |
|---|---|---|---|---|
| Valentine Chemicals · LA0000906 · LA Industrial | daily maximum 0.00037 ug/L, new | Oct 1, 2027 | 0 ug/L (3 values) | 0× |
| Valentine Chemicals · LA0000906 · LA Industrial | monthly average 0.00016 ug/L, new | Oct 1, 2027 | 0 ug/L (3 values) | 0× |
| Dover Chemical Corporation · OH0007269 · OH Industrial, major | monthly average 0.0000089 kg/d, tighter | Oct 1, 2027 | — | — |
| Dover Chemical Corporation · OH0007269 · OH Industrial, major | monthly average 0.00046 ug/L, tighter | Oct 1, 2027 | — | — |
New: a limit on something the outfall was never limited on. Tighter: lower than the limit in force. Median: the plant's own reports, Oct 1, 2025 to Sep 30, 2026; none where most were below detection.
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Read the permit before relying on a value. Source: EPA ECHO, Oct 16, 2026. As JSON: /api/v1/permits?state=OH&upcoming=true · MCP: https://passage-data.com/mcp