US SILICA COMPANY

NPDES permit TX0001368 · Minor NON-POTW · effective, expires 2029-09-27 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

0values over a limit
0required values missing, on 0 form(s)
0of 48 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among TX permits in EPA's filings — check your permit).

Limits in force (24)

OutfallParameterStatisticLimitMonths
001TurbidityDAILY MX <= 100 NTU all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Sulfate, total [as SO4]DAILY MX <= 500 mg/L all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX <= 2.5 MGD all year
002TurbidityDAILY MX <= 100 NTU all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedDAILY MX <= 45 mg/L all year
002Sulfate, total [as SO4]DAILY MX <= 500 mg/L all year
002Flow, in conduit or thru treatment plantDAILY AV report only all year
002Flow, in conduit or thru treatment plantDAILY MX <= 2.5 MGD all year
004TurbidityDAILY MX <= 100 NTU all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspendedDAILY MX <= 45 mg/L all year
004Sulfate, total [as SO4]DAILY MX <= 500 mg/L all year
004Chromium, hexavalent [as Cr]DAILY MX <= .028 mg/L all year
004Copper, total [as Cu]DAILY MX <= .0561 mg/L all year
004Flow, in conduit or thru treatment plantDAILY AV report only all year
004Flow, in conduit or thru treatment plantDAILY MX <= 2.5 MGD all year
SUMFlow, in conduit or thru treatment plantDAILY MX <= 4 MGD 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