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ST Paper LLC

Pulp Mills, major discharger, Oconto, Wisconsin. NPDES permit WI0000531 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit once (last May 2026), 42 required values missing, 27 of 51 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (15 values), outfall 002 form A monthly (4 values), outfall 007 form A monthly (2 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
3 values over a limit, 2 required values missing, 33 of 60 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimit
May 2026pH, daily minimum5.9≥ 6 SU

Limits in force (30)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 1504 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 2896 lb/dall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 1813 lb/dall year001
Solids, total suspendeddaily maximum≤ 3367 lb/dall year001
Phosphorus, total [as P]rolling average≤ 1 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 8.2 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualweekly average≤ 440 ug/Lall year001
Chlorine, total residualmonthly average≤ 440 ug/Lall year001
Chlorine, total residualdaily maximum≤ 600 ug/Lall year001
Mercury, total recoverabledaily maximum≤ 32 ng/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 1504 lb/dall year002
BOD, 5-day, 20 deg. Cdaily maximum≤ 2896 lb/dall year002
Solids, total suspendedmonthly average≤ 1813 lb/dall year002
Solids, total suspendeddaily maximum≤ 3367 lb/dall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (gal/d)all year007
Flow, in conduit or thru treatment plantdaily maximumreport only (gal/d)all year007
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year008
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year008
pHdaily minimumreport only (SU)all year008
pHdaily maximumreport only (SU)all year008
Solids, total suspendedmonthly averagereport only (lb/d)all year008
Solids, total suspendeddaily maximumreport only (lb/d)all year008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year008
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year008
Mercury, total recoverabledaily maximumreport only (ng/L)all year703

How strict are these limits?

Cited limits by parameter: Wisconsin's rules and the federal ones.

Same industry: the 22 Paper and Allied Products permits in Wisconsin.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0000531 · MCP: https://passage-data.com/mcp