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US Silica Co

Industrial or other facility, Mill Creek, Pennsylvania. NPDES permit PA0279668, in force until Mar 14, 2029. Last 12 months: no values over a limit, 186 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 006A form A quarterly (24 values), outfall 007A form A quarterly (22 values), outfall 008A form A quarterly (16 values)
Last report on file
March 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (62)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year006A
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year006A
Specific conductanceinstantaneous maximumreport only (umho/cm)all year006A
Specific conductanceinstantaneous maximumreport only (umho/cm)all year006A
pHinstantaneous minimum≥ 6 SUall year006A
pHinstantaneous maximum≤ 9 SUall year006A
pHinstantaneous minimum≥ 6 SUall year006A
pHinstantaneous maximum≤ 9 SUall year006A
pHinstantaneous minimum≥ 6 SUall year006A
pHinstantaneous maximum≤ 9 SUall year006A
Solids, total suspendedmonthly average≤ 35 mg/Lall year006A
Solids, total suspendeddaily maximum≤ 70 mg/Lall year006A
Solids, total suspendedinstantaneous maximum≤ 90 mg/Lall year006A
Solids, settleableinstantaneous maximum≤ .5 mL/Lall year006A
Sulfate, total [as SO4]instantaneous maximumreport only (mg/L)all year006A
Sulfate, total [as SO4]instantaneous maximumreport only (mg/L)all year006A
Iron, total [as Fe]instantaneous maximumreport only (mg/L)all year006A
Manganese, total [as Mn]instantaneous maximumreport only (mg/L)all year006A
Manganese, total [as Mn]instantaneous maximumreport only (mg/L)all year006A
Aluminum, total [as Al]monthly average≤ 2 mg/Lall year006A
Aluminum, total [as Al]daily maximum≤ 4 mg/Lall year006A
Aluminum, total [as Al]instantaneous maximum≤ 5 mg/Lall year006A
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (gal/min)all year006A
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (gal/min)all year006A
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year007A
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year007A
Specific conductanceinstantaneous maximumreport only (umho/cm)all year007A
Specific conductanceinstantaneous maximumreport only (umho/cm)all year007A
pHinstantaneous minimum≥ 6 SUall year007A
pHinstantaneous maximum≤ 9 SUall year007A
pHinstantaneous minimum≥ 6 SUall year007A
pHinstantaneous maximum≤ 9 SUall year007A
pHinstantaneous minimum≥ 6 SUall year007A
pHinstantaneous maximum≤ 9 SUall year007A
Solids, total suspendedmonthly average≤ 35 mg/Lall year007A
Solids, total suspendeddaily maximum≤ 70 mg/Lall year007A
Solids, total suspendedinstantaneous maximum≤ 90 mg/Lall year007A
Solids, settleableinstantaneous maximumreport only (mL/L)all year007A
Sulfate, total [as SO4]instantaneous maximumreport only (mg/L)all year007A
Sulfate, total [as SO4]instantaneous maximumreport only (mg/L)all year007A
Iron, total [as Fe]instantaneous maximumreport only (mg/L)all year007A
Manganese, total [as Mn]instantaneous maximumreport only (mg/L)all year007A
Manganese, total [as Mn]instantaneous maximumreport only (mg/L)all year007A
Aluminum, total [as Al]instantaneous maximumreport only (mg/L)all year007A
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (gal/min)all year007A
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (gal/min)all year007A
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year008A
Specific conductanceinstantaneous maximumreport only (umho/cm)all year008A
pHinstantaneous minimum≥ 6 SUall year008A
pHinstantaneous maximum≤ 9 SUall year008A
Solids, total suspendedmonthly average≤ 35 mg/Lall year008A
Solids, total suspendeddaily maximum≤ 70 mg/Lall year008A
Solids, total suspendedinstantaneous maximum≤ 90 mg/Lall year008A
Sulfate, total [as SO4]instantaneous maximumreport only (mg/L)all year008A
Iron, total [as Fe]monthly average≤ 1.5 mg/Lall year008A
Iron, total [as Fe]daily maximum≤ 3 mg/Lall year008A
Iron, total [as Fe]instantaneous maximum≤ 3.7 mg/Lall year008A
Manganese, total [as Mn]instantaneous maximumreport only (mg/L)all year008A
Aluminum, total [as Al]monthly average≤ .75 mg/Lall year008A
Aluminum, total [as Al]daily maximum≤ 1.5 mg/Lall year008A
Aluminum, total [as Al]instantaneous maximum≤ 1.8 mg/Lall year008A
Flow, in conduit or thru treatment plantinstantaneous maximumreport only (gal/min)all year008A

How strict are these limits?

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

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/PA0279668 · MCP: https://passage-data.com/mcp