Lhoist North America of Virginia Incorporated

NPDES permit VA0000523 · Minor NON-POTW · effective, expires 2031-06-30 · 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
20required values missing, on 8 form(s)
0of 51 forms filed late

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

Reporting

Reports are due about 10 days after each monitoring period ends (the most common figure among VA permits in EPA's filings — check your permit).

Limits in force (47)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMAXIMUM <= 21 deg C all year
001Oxygen, dissolved [DO]MINIMUM >= 5 mg/L all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 60 mg/L all year
001Oil & GreaseMO AVG <= 10 mg/L all year
001Oil & GreaseDAILY MX <= 15 mg/L all year
001Chromium, hexavalent dissolved [as Cr]MO AVG <= 4.3 ug/L all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX <= 4.3 ug/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Length of longest pH excursionET <= 60 min all year
001pH range excursions, monthly total accumMO TOTAL <= 446 min all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMAXIMUM <= 1.85 tox chronic all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedDAILY MX <= 50 mg/L all year
002Oil & GreaseMO AVG <= 10 mg/L all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Nitrite + Nitrate total [as N]DAILY MX report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003Temperature, water deg. centigradeMAXIMUM <= 21 deg C all year
003Oxygen, dissolved [DO]MINIMUM >= 5 mg/L all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedMO AVG <= 30 mg/L all year
003Solids, total suspendedDAILY MX <= 60 mg/L all year
003Oil & GreaseDAILY MX <= 15 mg/L all year
003Hardness, total [as CaCO3]MAXIMUM report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Toxic Units Static 48HR Acute Ceriodaphnia dubiaMAXIMUM report only all year
004pHDAILY MN >= 6 SU all year
004pHDAILY MX <= 9 SU all year
004Solids, total suspendedDAILY MX report only all year
004Precipitation volumeDAILY MX report only all year
005pHDAILY MN >= 6 SU all year
005pHDAILY MX <= 9 SU all year
005Solids, total suspendedDAILY MX <= 50 mg/L all year
005Precipitation volumeDAILY MX report only all year
301pHDAILY MN >= 6 SU all year
301pHDAILY MX <= 9 SU all year
301Solids, total suspendedDAILY MX <= 50 mg/L all year
301Precipitation volumeDAILY MX 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