UNITED STATES GYPSUM COMPANY

NPDES permit MD0001457 · Minor NON-POTW · effective, expires 2029-05-31 · 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 20 forms filed late

Last period with anything received: 2026-06-30.

Reporting

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

Limits in force (84)

OutfallParameterStatisticLimitMonths
002Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
002Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
002BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
002BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
002BOD, 5-day, 20 deg. CMO AVG <= 7 lb/d all year
002BOD, 5-day, 20 deg. CMO AVG <= 7 lb/d all year
002BOD, 5-day, 20 deg. CDAILY MX <= 10.5 lb/d all year
002BOD, 5-day, 20 deg. CDAILY MX <= 10.5 lb/d all year
002pHMINIMUM >= 6 SU all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedDAILY MX <= 45 mg/L all year
002Solids, total suspendedDAILY MX <= 45 mg/L all year
002Solids, total suspendedMO AVG <= 7 lb/d all year
002Solids, total suspendedMO AVG <= 7 lb/d all year
002Solids, total suspendedDAILY MX <= 10.5 lb/d all year
002Solids, total suspendedDAILY MX <= 10.5 lb/d all year
002Nitrogen, total [as N]MO AVG report only all year
002Nitrogen, total [as N]MO AVG report only all year
002Nitrogen, total [as N]ANNL MAX <= 933 lb/yr all year
002Nitrogen, total [as N]ANNL MAX <= 933 lb/yr all year
002Nitrogen, total [as N]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, total [as N]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, total [as N]TC <= 466 lb/yr May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, total [as N]TC <= 466 lb/yr May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, organic total [as N]MO AVG report only all year
002Nitrogen, organic total [as N]MO AVG report only all year
002Nitrogen, organic total [as N]DAILY MX report only all year
002Nitrogen, organic total [as N]DAILY MX report only all year
002Nitrogen, ammonia total [as N]MO AVG report only all year
002Nitrogen, ammonia total [as N]MO AVG report only all year
002Nitrogen, ammonia total [as N]DAILY MX report only all year
002Nitrogen, ammonia total [as N]DAILY MX report only all year
002Nitrite + Nitrate total [as N]MO AVG report only all year
002Nitrite + Nitrate total [as N]MO AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]ANNL MAX <= 155 lb/yr all year
002Phosphorus, total [as P]ANNL MAX <= 155 lb/yr all year
002Phosphorus, total [as P]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
002Phosphorus, total [as P]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
002Phosphorus, total [as P]TC <= 73 lb/yr May, Jun, Jul, Aug, Sep, Oct
002Phosphorus, total [as P]TC <= 73 lb/yr May, Jun, Jul, Aug, Sep, Oct
002Fecal coliformMO GEO <= 14 MPN/g all year
002Fecal coliformMO GEO <= 14 MPN/g all year
002Fecal coliformMO GEO <= 14 MPN/g all year
002Fecal coliformMO GEO <= 14 MPN/g all year
002Fecal coliformDAILY MX report only all year
002Fecal coliformDAILY MX report only all year
002Flow, in conduit or thru treatment plantMO AVG 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
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualMO AVG < .1 mg/L all year
002Chlorine, total residualMO AVG < .1 mg/L all year
002Chlorine, total residualDAILY MX < .1 mg/L all year
002Chlorine, total residualDAILY MX < .1 mg/L all year
002EnterococciMO GEOMN <= 35 MPN/100mL all year
002EnterococciMO GEOMN <= 35 MPN/100mL all year
002EnterococciDAILY MX report only all year
002EnterococciDAILY MX report only all year
003Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
003Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
003pHMINIMUM >= 6 SU all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003pHMAXIMUM <= 9 SU all year
003Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
003Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Chlorine, total residualMO AVG <= .1 mg/L all year
003Chlorine, total residualMO AVG <= .1 mg/L all year
003Chlorine, total residualDAILY MX <= .1 mg/L all year
003Chlorine, total residualDAILY MX <= .1 mg/L 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