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3M - Arch Street Plant

Clay And Related Minerals, Little Rock, Arkansas. NPDES permit AR0001414, in force until Jan 31, 2029. Last 12 months: over a limit 4 times (last April 2026), 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 8 days after each period: outfall 001 form A monthly (11 values), outfall 002 form A monthly (13 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 26 reports late

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

Period endingParameterReportedLimitOver by
February 2026Oxygen demand, chem. [low level] [COD], daily maximum91 mg/L≤ 75 mg/L21%
February 2026Oxygen demand, chem. [low level] [COD], monthly average75 mg/L≤ 50 mg/L50%
April 2026Oxygen demand, chem. [low level] [COD], daily maximum80 mg/L≤ 75 mg/L7%
April 2026Oxygen demand, chem. [low level] [COD], monthly average67 mg/L≤ 50 mg/L34%

Limits in force (26)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LMay–Oct001
Oxygen demand, chem. [low level] [COD]monthly average≤ 50 mg/Lall year001
Oxygen demand, chem. [low level] [COD]daily maximum≤ 75 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 35 mg/Lall year001
Solids, total suspendeddaily maximum≤ 52.5 mg/Lall year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall 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
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec002
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/LMay–Oct002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 35 mg/Lall year002
Solids, total suspendeddaily maximum≤ 52.5 mg/Lall year002
Solids, total suspendedmonthly average≤ 496.2 lb/dall year002
Solids, total suspendeddaily maximum≤ 744.3 lb/dall year002
Oil & Greasemonthly average≤ 10 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Oil & Greasemonthly average≤ 141.8 lb/dall year002
Oil & Greasedaily maximum≤ 212.7 lb/dall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002

How strict are these limits?

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

Same industry: the 30 Mining and Quarrying of Nonmetallic Minerals permits in Arkansas.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0001414 · MCP: https://passage-data.com/mcp