US Silica Co — NPDES permit PA0125334: limits, due date and EPA's record

Industrial or other facility, Mill Creek, Pennsylvania. NPDES permit PA0125334, in force until Sep 20, 2028. Last 12 months: no values over a limit, 300 required values missing. Source: EPA ECHO, Oct 22, 2026.

Limits in force (200)

Parameter	Statistic	Limit	Months	Outfall
pH	instantaneous minimum	≥ 6 SU	all year	005
pH	instantaneous minimum	≥ 6 SU	all year	005
pH	instantaneous maximum	≤ 9 SU	all year	005
pH	instantaneous maximum	≤ 9 SU	all year	005
Solids, total suspended	monthly average	≤ 35 mg/L	all year	005
Solids, total suspended	monthly average	≤ 35 mg/L	all year	005
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	005
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	005
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	005
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	005
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	005
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	005
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	005
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	005
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	005
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	005
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	005
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	005
pH	instantaneous minimum	≥ 6 SU	all year	006
pH	instantaneous minimum	≥ 6 SU	all year	006
pH	instantaneous maximum	≤ 9 SU	all year	006
pH	instantaneous maximum	≤ 9 SU	all year	006
Solids, total suspended	monthly average	≤ 35 mg/L	all year	006
Solids, total suspended	monthly average	≤ 35 mg/L	all year	006
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	006
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	006
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	006
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	006
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	006
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	006
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	006
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	006
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	006
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	006
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	006
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	006
pH	instantaneous minimum	≥ 6 SU	all year	008
pH	instantaneous minimum	≥ 6 SU	all year	008
pH	instantaneous maximum	≤ 9 SU	all year	008
pH	instantaneous maximum	≤ 9 SU	all year	008
pH	instantaneous minimum	≥ 6 SU	all year	008
pH	instantaneous minimum	≥ 6 SU	all year	008
pH	instantaneous maximum	≤ 9 SU	all year	008
pH	instantaneous maximum	≤ 9 SU	all year	008
pH	instantaneous minimum	≥ 6 SU	all year	008
pH	instantaneous minimum	≥ 6 SU	all year	008
pH	instantaneous maximum	≤ 9 SU	all year	008
pH	instantaneous maximum	≤ 9 SU	all year	008
Solids, total suspended	monthly average	≤ 35 mg/L	all year	008
Solids, total suspended	monthly average	≤ 35 mg/L	all year	008
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	008
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	008
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	008
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	008
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	008
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	008
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	008
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	008
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	008
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	008
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	008
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	008
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	008
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	008
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (MGD)	all year	008
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (MGD)	all year	008
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	008
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	008
pH	instantaneous minimum	≥ 6 SU	all year	009
pH	instantaneous minimum	≥ 6 SU	all year	009
pH	instantaneous maximum	≤ 9 SU	all year	009
pH	instantaneous maximum	≤ 9 SU	all year	009
pH	instantaneous minimum	≥ 6 SU	all year	009
pH	instantaneous minimum	≥ 6 SU	all year	009
pH	instantaneous maximum	≤ 9 SU	all year	009
pH	instantaneous maximum	≤ 9 SU	all year	009
pH	instantaneous minimum	≥ 6 SU	all year	009
pH	instantaneous minimum	≥ 6 SU	all year	009
pH	instantaneous maximum	≤ 9 SU	all year	009
pH	instantaneous maximum	≤ 9 SU	all year	009
Solids, total suspended	monthly average	≤ 35 mg/L	all year	009
Solids, total suspended	monthly average	≤ 35 mg/L	all year	009
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	009
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	009
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	009
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	009
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	009
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	009
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	009
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	009
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	009
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	009
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	009
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	009
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	009
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	009
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	009
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	009
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	009
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	009
pH	instantaneous minimum	≥ 6 SU	all year	010
pH	instantaneous minimum	≥ 6 SU	all year	010
pH	instantaneous maximum	≤ 9 SU	all year	010
pH	instantaneous maximum	≤ 9 SU	all year	010
Solids, total suspended	monthly average	≤ 30 mg/L	all year	010
Solids, total suspended	monthly average	≤ 30 mg/L	all year	010
Solids, total suspended	daily maximum	≤ 60 mg/L	all year	010
Solids, total suspended	daily maximum	≤ 60 mg/L	all year	010
Solids, total suspended	instantaneous maximum	≤ 75 mg/L	all year	010
Solids, total suspended	instantaneous maximum	≤ 75 mg/L	all year	010
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	010
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	010
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	010
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	010
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	010
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	010
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	010
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	010
pH	instantaneous minimum	≥ 6 SU	all year	011
pH	instantaneous minimum	≥ 6 SU	all year	011
pH	instantaneous maximum	≤ 9 SU	all year	011
pH	instantaneous maximum	≤ 9 SU	all year	011
Solids, total suspended	monthly average	≤ 30 mg/L	all year	011
Solids, total suspended	monthly average	≤ 30 mg/L	all year	011
Solids, total suspended	daily maximum	≤ 60 mg/L	all year	011
Solids, total suspended	daily maximum	≤ 60 mg/L	all year	011
Solids, total suspended	instantaneous maximum	≤ 75 mg/L	all year	011
Solids, total suspended	instantaneous maximum	≤ 75 mg/L	all year	011
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	011
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	011
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	011
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	011
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	011
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	011
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	011
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	011
pH	instantaneous minimum	≥ 6 SU	all year	013N
pH	instantaneous minimum	≥ 6 SU	all year	013N
pH	instantaneous maximum	≤ 9 SU	all year	013N
pH	instantaneous maximum	≤ 9 SU	all year	013N
pH	instantaneous minimum	≥ 6 SU	all year	013N
pH	instantaneous minimum	≥ 6 SU	all year	013N
pH	instantaneous maximum	≤ 9 SU	all year	013N
pH	instantaneous maximum	≤ 9 SU	all year	013N
pH	instantaneous minimum	≥ 6 SU	all year	013N
pH	instantaneous minimum	≥ 6 SU	all year	013N
pH	instantaneous maximum	≤ 9 SU	all year	013N
pH	instantaneous maximum	≤ 9 SU	all year	013N
Solids, total suspended	monthly average	≤ 35 mg/L	all year	013N
Solids, total suspended	monthly average	≤ 35 mg/L	all year	013N
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	013N
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	013N
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	013N
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	013N
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	013N
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	013N
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	013N
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	013N
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	013N
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	013N
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	013N
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	013N
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	013N
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	013N
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	013N
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	013N
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	013N
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	013N
pH	instantaneous minimum	≥ 6 SU	all year	015
pH	instantaneous minimum	≥ 6 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
pH	instantaneous minimum	≥ 6 SU	all year	015
pH	instantaneous minimum	≥ 6 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
pH	instantaneous minimum	≥ 6 SU	all year	015
pH	instantaneous minimum	≥ 6 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
Solids, total suspended	monthly average	≤ 35 mg/L	all year	015
Solids, total suspended	monthly average	≤ 35 mg/L	all year	015
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	015
Solids, total suspended	daily maximum	≤ 70 mg/L	all year	015
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	015
Solids, total suspended	instantaneous maximum	≤ 90 mg/L	all year	015
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	015
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	015
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	015
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	015
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	015
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	015
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	015
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	015
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	015
Iron, total [as Fe]	instantaneous maximum	≤ 7 mg/L	all year	015
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	015
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	015
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	015
Flow, in conduit or thru treatment plant	instantaneous maximum	report only (gal/min)	all year	015

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/PA0125334 · MCP: https://passage-data.com/mcp