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Heavy Construction — NPDES discharge permits in Montana

Of the 4 permits in EPA's SIC 16 in MT, 1 went over a limit between 2025-10-01 and 2026-09-30 (Aluminum, dissolved [as Al]: 1; Iron, total [as Fe]: 1; Zinc, total recoverable: 1). 2 are past the expiry date EPA's file holds; 0 have a renewal application overdue or due within 18 months. EPA's file of 2026-10-15.

FacilityLast 12 monthsPermit
Montana DEQ
MT0032247 · Water, Sewer, And Utility Lines
Over a limit 36×: Iron, total [as Fe] (16×), Aluminum, dissolved [as Al] (10×), Zinc, total recoverable (7×)Expires Nov 20, 2030
CH SP ACQUISITION LLC
MT0032174 · Water, Sewer, And Utility Lines
No value over a limitExpires Oct 31, 2030
USCOE LIBBY DAM
MT0022390 · Water, Sewer, And Utility Lines
No value over a limitPermit past the expiry date EPA's file holds
YELLOWSTONE CLUB LLC
MT0032051 · Water, Sewer, And Utility Lines
No value over a limitPermit past the expiry date EPA's file holds

The record is EPA's ICIS-NPDES file of 2026-10-15: values filed against each limit between Oct 1, 2025 and Sep 30, 2026. No reports on file may be EPA's gap, not the facility's.

For programs and AI agents: this screen as JSON at /api/v1/permits?state=MT&sic=16, narrowed with &over_limit=true, &parameter=phosphorus or &renewal=due; or add https://passage-data.com/mcp as a remote MCP server (tool list_permits). Free, no key. llms.txt

From EPA's ECHO data, not the permit document itself: your permit is the final word. All states