LINCOLN COUNTY PORT AUTHORITY LCPA

NPDES permit MT0000221 · Minor NON-POTW · expired 2023-02-28 · EPA's file as of 2026-09-26

Keep this permit as a site — opens New site at EPA's facility point (48.381667, -115.539722); you set the radius.

These are the last limits EPA's file holds for this permit, from an earlier version of it (version 0 in EPA's file): its current version carries none yet. Read your permit: a renewal can change them.

EPA's record, 2025-09-01 to 2026-08-31

Last period with anything received: none.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MT permits in EPA's filings — check your permit).

• Outfall 002, form A (MONTHLY MONITORING AT END OF PIPE): every 1 month(s), 23 values
• Outfall 002, form S (SEMIANNUAL MONITORING AT END OF PIPE): every 6 month(s), 1 values
• Outfall 005, form A (GROUNDWATER DEWATERING DISCHARGE): every 1 month(s), 5 values

How strict are these limits?

Each concentration limit against the same limit in comparable permits. Where it appears more than once, its strictest value.

• Solids, total suspended, monthly average 30 mg/L — stricter than 44% of 25 other minor industrial and other permits in Montana; 40% have the same limit
• Oil and grease, hexane extr method, daily maximum 10 mg/L — stricter than 42% of 622 other minor industrial and other permits nationwide; 50% have the same limit
• BOD, 5-day, 20 deg. C, weekly average 45 mg/L — stricter than 18% of 1161 other minor industrial and other permits nationwide; 43% have the same limit
• Chlorine, total residual, daily maximum .1 mg/L — stricter than 17% of 3547 other minor industrial and other permits nationwide; 5% have the same limit
• Solids, total suspended, weekly average 45 mg/L — stricter than 17% of 1625 other minor industrial and other permits nationwide; 53% have the same limit
• BOD, 5-day, 20 deg. C, monthly average 30 mg/L — stricter than 13% of 2444 other minor industrial and other permits nationwide; 48% have the same limit
• BOD, 5-day, percent removal, minimum at least 85 % — stricter than 6% of 59 other minor industrial and other permits nationwide; 90% have the same limit
• Solids, suspended percent removal, minimum at least 85 % — stricter than 6% of 98 other minor industrial and other permits nationwide; 92% have the same limit
• pH, instantaneous minimum at least 6 SU — stricter than 0% of 3683 other minor industrial and other permits nationwide; 89% have the same limit
• pH, instantaneous maximum 9 SU — stricter than 0% of 3812 other minor industrial and other permits nationwide; 95% have the same limit

2 other limits: fewer than 20 comparable permits.

Limits in force (31)

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states