US SILICA CO

NPDES permit PA0279668 · Minor NON-POTW · effective, expires 2029-03-14 · EPA's file as of 2026-09-19

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EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
186required values missing, on 9 form(s)
0of 30 forms filed late

Last period with anything received: 2026-03-31.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among PA permits in EPA's filings — check your permit).

Limits in force (62)

OutfallParameterStatisticLimitMonths
006ATemperature, water deg. centigradeINST MAX report only all year
006ATemperature, water deg. centigradeINST MAX report only all year
006ASpecific conductanceINST MAX report only all year
006ASpecific conductanceINST MAX report only all year
006ApHINST MIN >= 6 SU all year
006ApHINST MAX <= 9 SU all year
006ApHINST MIN >= 6 SU all year
006ApHINST MAX <= 9 SU all year
006ApHINST MIN >= 6 SU all year
006ApHINST MAX <= 9 SU all year
006ASolids, total suspendedMO AVG <= 35 mg/L all year
006ASolids, total suspendedDAILY MX <= 70 mg/L all year
006ASolids, total suspendedINST MAX <= 90 mg/L all year
006ASolids, settleableINST MAX <= .5 mL/L all year
006ASulfate, total [as SO4]INST MAX report only all year
006ASulfate, total [as SO4]INST MAX report only all year
006AIron, total [as Fe]INST MAX report only all year
006AManganese, total [as Mn]INST MAX report only all year
006AManganese, total [as Mn]INST MAX report only all year
006AAluminum, total [as Al]MO AVG <= 2 mg/L all year
006AAluminum, total [as Al]DAILY MX <= 4 mg/L all year
006AAluminum, total [as Al]INST MAX <= 5 mg/L all year
006AFlow, in conduit or thru treatment plantINST MAX report only all year
006AFlow, in conduit or thru treatment plantINST MAX report only all year
007ATemperature, water deg. centigradeINST MAX report only all year
007ATemperature, water deg. centigradeINST MAX report only all year
007ASpecific conductanceINST MAX report only all year
007ASpecific conductanceINST MAX report only all year
007ApHINST MIN >= 6 SU all year
007ApHINST MAX <= 9 SU all year
007ApHINST MIN >= 6 SU all year
007ApHINST MAX <= 9 SU all year
007ApHINST MIN >= 6 SU all year
007ApHINST MAX <= 9 SU all year
007ASolids, total suspendedMO AVG <= 35 mg/L all year
007ASolids, total suspendedDAILY MX <= 70 mg/L all year
007ASolids, total suspendedINST MAX <= 90 mg/L all year
007ASolids, settleableINST MAX report only all year
007ASulfate, total [as SO4]INST MAX report only all year
007ASulfate, total [as SO4]INST MAX report only all year
007AIron, total [as Fe]INST MAX report only all year
007AManganese, total [as Mn]INST MAX report only all year
007AManganese, total [as Mn]INST MAX report only all year
007AAluminum, total [as Al]INST MAX report only all year
007AFlow, in conduit or thru treatment plantINST MAX report only all year
007AFlow, in conduit or thru treatment plantINST MAX report only all year
008ATemperature, water deg. centigradeINST MAX report only all year
008ASpecific conductanceINST MAX report only all year
008ApHINST MIN >= 6 SU all year
008ApHINST MAX <= 9 SU all year
008ASolids, total suspendedMO AVG <= 35 mg/L all year
008ASolids, total suspendedDAILY MX <= 70 mg/L all year
008ASolids, total suspendedINST MAX <= 90 mg/L all year
008ASulfate, total [as SO4]INST MAX report only all year
008AIron, total [as Fe]MO AVG <= 1.5 mg/L all year
008AIron, total [as Fe]DAILY MX <= 3 mg/L all year
008AIron, total [as Fe]INST MAX <= 3.7 mg/L all year
008AManganese, total [as Mn]INST MAX report only all year
008AAluminum, total [as Al]MO AVG <= .75 mg/L all year
008AAluminum, total [as Al]DAILY MX <= 1.5 mg/L all year
008AAluminum, total [as Al]INST MAX <= 1.8 mg/L all year
008AFlow, in conduit or thru treatment plantINST MAX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states