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US Silica Company

Industrial Sand, Kosse, Texas. NPDES permit TX0001368, in force until Sep 27, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (7 values), outfall 002 form A monthly (7 values), outfall 004 form A monthly (7 values), outfall 004 form Q quarterly (2 values), outfall SUM form A monthly (1 value)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 52 reports late

Limits in force (24)

ParameterStatisticLimitMonthsOutfall
Turbiditydaily maximum≤ 100 NTUall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Sulfate, total [as SO4]daily maximum≤ 500 mg/Lall year001
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximum≤ 2.5 MGDall year001
Turbiditydaily maximum≤ 100 NTUall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendeddaily maximum≤ 45 mg/Lall year002
Sulfate, total [as SO4]daily maximum≤ 500 mg/Lall year002
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximum≤ 2.5 MGDall year002
Turbiditydaily maximum≤ 100 NTUall year004
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Solids, total suspendeddaily maximum≤ 45 mg/Lall year004
Sulfate, total [as SO4]daily maximum≤ 500 mg/Lall year004
Chromium, hexavalent [as Cr]daily maximum≤ .028 mg/Lall year004
Copper, total [as Cu]daily maximum≤ .0561 mg/Lall year004
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximum≤ 2.5 MGDall year004
Flow, in conduit or thru treatment plantdaily maximum≤ 4 MGDall yearSUM

New limits from Oct 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chromium, hexavalent [as Cr], daily maximum0.0253 mg/Ltighter——
Copper, total [as Cu], daily maximum0.0426 mg/Ltighter——

How strict are these limits?

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

Same industry: the 13 Mining and Quarrying of Nonmetallic Minerals permits in Texas.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0001368 · MCP: https://passage-data.com/mcp