CERTAINTEED GYPSUM MFG., INC.

NPDES permit AR0020729 · Minor NON-POTW · administratively continued, expires 2025-12-31 · 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.

This permit expired on 2025-12-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
4required values missing, on 1 form(s)
5of 63 forms filed late

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

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (104)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 3 mg/L May, Jun, Jul, Aug, Sep, Oct
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 15 mg/L all year
001Solids, total suspendedDAILY MX <= 22.5 mg/L all year
001Solids, total suspendedMO AVG <= 64.8 lb/d all year
001Solids, total suspendedDAILY MX <= 97.2 lb/d all year
001Oil & GreaseMO AVG <= 10 mg/L all year
001Oil & GreaseDAILY MX <= 15 mg/L all year
001Oil & GreaseMO AVG <= 43.2 lb/d all year
001Oil & GreaseDAILY MX <= 64.8 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 5 mg/L Apr
001Nitrogen, ammonia total [as N]MO AVG <= 5 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 7.5 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 21.6 lb/d Apr
001Nitrogen, ammonia total [as N]MO AVG <= 21.6 lb/d Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 21.6 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 26.4 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 32.4 lb/d Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 26.4 lb/d May, Jun, Jul, Aug, Sep, Oct
001Sulfate, total [as SO4]MO AVG report only all year
001Sulfate, total [as SO4]DAILY MX report only all year
001Sulfate, total [as SO4]MO AVG report only all year
001Sulfate, total [as SO4]DAILY MX report only 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
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Coliform, fecal general30DA GEO <= 1000 #/100mL all year
001Coliform, fecal general7 DA GEO <= 2000 #/100mL all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 15 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 43.2 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 64.8 lb/d all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG <= 20 mg/L all year
002Solids, total suspendedDAILY MX <= 30 mg/L all year
002Oil & GreaseMO AVG <= 10 mg/L all year
002Oil & GreaseDAILY MX <= 15 mg/L 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
002BOxygen, dissolved [DO]INST MIN >= 3 mg/L May, Jun, Jul, Aug, Sep, Oct
002BOxygen, dissolved [DO]INST MIN >= 5 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002BpHMINIMUM >= 6 SU all year
002BpHMAXIMUM <= 9 SU all year
002BSolids, total suspendedMO AVG <= 15 mg/L all year
002BSolids, total suspendedDAILY MX <= 22.5 mg/L all year
002BOil & GreaseMO AVG <= 10 mg/L all year
002BOil & GreaseDAILY MX <= 15 mg/L all year
002BNitrogen, ammonia total [as N]MO AVG <= 5 mg/L Apr
002BNitrogen, ammonia total [as N]MO AVG <= 5 mg/L May, Jun, Jul, Aug, Sep, Oct
002BNitrogen, ammonia total [as N]MO AVG <= 5 mg/L Jan, Feb, Mar, Nov, Dec
002BNitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L Apr
002BNitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L May, Jun, Jul, Aug, Sep, Oct
002BNitrogen, ammonia total [as N]DAILY MX <= 7.5 mg/L Jan, Feb, Mar, Nov, Dec
002BSulfate, total [as SO4]MO AVG report only all year
002BSulfate, total [as SO4]DAILY MX report only all year
002BFlow, in conduit or thru treatment plantMO AVG report only all year
002BFlow, in conduit or thru treatment plantDAILY MX report only all year
002BSolids, total dissolvedMO AVG report only all year
002BSolids, total dissolvedDAILY MX report only all year
002BColiform, fecal general30DA GEO <= 1000 #/100mL all year
002BColiform, fecal general7 DA GEO <= 2000 #/100mL all year
002BBOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
002BBOD, carbonaceous [5 day, 20 C]DAILY MX <= 15 mg/L all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1WET, sublethal retest #17 DA MIN report only all year
TX1WET, sublethal retest #27 DA MIN report only all year
TX1Whole Effluent Toxicity - Retest #37 DA MIN report only all year
TX1Whole Effluent Toxicity, Sub-Lethal Retest #37 DA MIN report only all year
TX1Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA AVG report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA AVG report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA AVG report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA AVG report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA AVG report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA AVG report only all year
TX2BWhole effluent toxicity - retest #17 DA MIN report only all year
TX2BWhole effluent toxicity - retest #27 DA MIN report only all year
TX2BWET, sublethal retest #17 DA MIN report only all year
TX2BWET, sublethal retest #27 DA MIN report only all year
TX2BWhole Effluent Toxicity - Retest #37 DA MIN report only all year
TX2BWhole Effluent Toxicity, Sub-Lethal Retest #37 DA MIN report only all year
TX2BPass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2BPass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX2BLow Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2BLow Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2BNOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2BNOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2BNOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2BNOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2BCoef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2BCoef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA MIN 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