Lawton, City of-Lawton STP

NPDES permit OK0035246 · Major POTW · effective, expires 2030-09-30 · 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
0required values missing, on 0 form(s)
3of 67 forms filed late

Last period with anything received: 2026-08-31.

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (203)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 6 mg/L Jan, Feb, Mar, Nov, Dec
001Oxygen, dissolved [DO]INST MIN >= 6.5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 15 mg/L all year
001Solids, total suspendedWKLY AVG <= 22.5 mg/L all year
001Solids, total suspendedMO AVG <= 2251.8 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 2 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 3 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 3 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 4.5 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 300.2 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 450.4 lb/d Jan, Feb, Mar, Nov, Dec
001Phosphorous, total organic [as P]MO AVG report only all year
001Sulfate, total [as SO4]MO AVG report only all year
001Manganese, total [as Mn]MO AVG report only all year
001Selenium, total [as Se]MO AVG <= 4.74 ug/L all year
001Selenium, total [as Se]DAILY MX <= 8.21 ug/L all year
001Selenium, total [as Se]MO AVG <= .71 lb/d all year
001DichlorobromomethaneMO AVG <= 10.34 ug/L all year
001DichlorobromomethaneDAILY MX <= 15.09 ug/L all year
001DichlorobromomethaneMO AVG <= 1.55 lb/d 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
001Chlorine, total residualINST MAX <= .099 mg/L all year
001E. coliGEO MEAN <= 126 MPN/100mL May, Jun, Jul, Aug, Sep
001E. coliDAILY MX <= 406 MPN/100mL May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 1501.2 lb/d all year
002Oxygen, dissolved [DO]INST MIN >= 6 mg/L Jan, Feb, Mar, Nov, Dec
002Oxygen, dissolved [DO]INST MIN >= 6.5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG <= 15 mg/L all year
002Solids, total suspendedWKLY AVG <= 22.5 mg/L all year
002Solids, total suspendedMO AVG <= 2251.8 lb/d all year
002Nitrogen, ammonia total [as N]MO AVG <= 2 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]MO AVG <= 3 mg/L Jan, Feb, Mar, Nov, Dec
002Nitrogen, ammonia total [as N]WKLY AVG <= 3 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]WKLY AVG <= 4.5 mg/L Jan, Feb, Mar, Nov, Dec
002Nitrogen, ammonia total [as N]MO AVG <= 300.2 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]MO AVG <= 450.4 lb/d Jan, Feb, Mar, Nov, Dec
002Phosphorous, total organic [as P]MO AVG report only all year
002Sulfate, total [as SO4]MO AVG report only all year
002Manganese, total [as Mn]MO AVG report only all year
002Selenium, total [as Se]MO AVG <= 4.74 ug/L all year
002Selenium, total [as Se]DAILY MX <= 8.21 ug/L all year
002Selenium, total [as Se]MO AVG <= .71 lb/d all year
002DichlorobromomethaneMO AVG <= 10.34 ug/L all year
002DichlorobromomethaneDAILY MX <= 15.09 ug/L all year
002DichlorobromomethaneMO AVG <= 1.55 lb/d 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
002Chlorine, total residualINST MAX <= .099 mg/L all year
002E. coliGEO MEAN <= 126 MPN/100mL May, Jun, Jul, Aug, Sep
002E. coliDAILY MX <= 406 MPN/100mL May, Jun, Jul, Aug, Sep
002BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
002BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L all year
002BOD, carbonaceous [5 day, 20 C]MO AVG <= 1501.2 lb/d all year
003Oxygen, dissolved [DO]INST MIN >= 6 mg/L Jan, Feb, Mar, Nov, Dec
003Oxygen, dissolved [DO]INST MIN >= 6.5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedMO AVG <= 15 mg/L all year
003Solids, total suspendedWKLY AVG <= 22.5 mg/L all year
003Solids, total suspendedMO AVG <= 750.6 lb/d all year
003Nitrogen, ammonia total [as N]MO AVG <= 2 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
003Nitrogen, ammonia total [as N]MO AVG <= 3 mg/L Jan, Feb, Mar, Nov, Dec
003Nitrogen, ammonia total [as N]WKLY AVG <= 3 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
003Nitrogen, ammonia total [as N]WKLY AVG <= 4.5 mg/L Jan, Feb, Mar, Nov, Dec
003Nitrogen, ammonia total [as N]MO AVG <= 100.1 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
003Nitrogen, ammonia total [as N]MO AVG <= 150.1 lb/d Jan, Feb, Mar, Nov, Dec
003Phosphorous, total organic [as P]MO AVG report only all year
003Sulfate, total [as SO4]MO AVG report only all year
003Manganese, total [as Mn]MO AVG report only all year
003Selenium, total [as Se]MO AVG <= 4.74 ug/L all year
003Selenium, total [as Se]DAILY MX <= 8.21 ug/L all year
003Selenium, total [as Se]MO AVG <= .24 lb/d all year
003DichlorobromomethaneMO AVG <= 10.34 ug/L all year
003DichlorobromomethaneDAILY MX <= 15.09 ug/L all year
003DichlorobromomethaneMO AVG <= .52 lb/d 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
003Chlorine, total residualINST MAX <= .099 mg/L all year
003E. coliGEO MEAN <= 126 MPN/100mL May, Jun, Jul, Aug, Sep
003E. coliDAILY MX <= 406 MPN/100mL May, Jun, Jul, Aug, Sep
003BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
003BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L all year
003BOD, carbonaceous [5 day, 20 C]MO AVG <= 500.4 lb/d all year
SLDToxicity characteristic leaching procedureMO AV MN report only all year
SLDAnn. amt sludge disposed by other methodANNL TOT report only all year
SLDAnnual amt of sludge incineratedANNL TOT report only all year
SLDAnnual sludge production, totalANNL TOT report only all year
SLDAnnual amount of sludge land appliedANNL TOT report only all year
SLDAnnual amt. sludge disposed surface unitANNL TOT report only all year
SLDAnnual amt sludge disposed in landfillANNL TOT report only all year
SLDAnnual amt sludge transported interstateANNL TOT report only all year
SLDCompliance w/part 258 sludge requirementVALUE report only all year
SLLArsenic, dry weightSINGSAMP report only all year
SLLArsenic, dry weightMAXIMUM <= 75 mg/kg all year
SLLArsenic, dry weightM0 <= 41 kg/ha all year
SLLSelenium, dry weightSINGSAMP report only all year
SLLSelenium, dry weightMAXIMUM <= 100 mg/kg all year
SLLSelenium, dry weightM0 <= 100 kg/ha all year
SLLPolychlorinated biphenyls [PCBs]ANNL MAX <= 49.99 mg/kg all year
SLLCopper, dry weightSINGSAMP report only all year
SLLCopper, dry weightMAXIMUM <= 4300 mg/kg all year
SLLCopper, dry weightM0 <= 1500 kg/ha all year
SLLCadmium, dry weightSINGSAMP report only all year
SLLCadmium, dry weightMAXIMUM <= 85 mg/kg all year
SLLCadmium, dry weightM0 <= 39 kg/ha all year
SLLAnnual whole sludge application rateM0 report only all year
SLLMolybdenum, sludge, total, dry weight [as Mo]SINGSAMP report only all year
SLLMolybdenum, sludge, total, dry weight [as Mo]MAXIMUM <= 75 mg/kg all year
SLLMolybdenum, sludge, total, dry weight [as Mo]M0 report only all year
SLLZinc, sludge, total, dry weight [as Zn]SINGSAMP report only all year
SLLZinc, sludge, total, dry weight [as Zn]MAXIMUM <= 7500 mg/kg all year
SLLZinc, sludge, total, dry weight [as Zn]M0 <= 2800 kg/ha all year
SLLLead, sludge, total, dry weight [as Pb]SINGSAMP report only all year
SLLLead, sludge, total, dry weight [as Pb]MAXIMUM <= 840 mg/kg all year
SLLLead, sludge, total, dry weight [as Pb]M0 <= 300 kg/ha all year
SLLNickel, sludge, total, dry weight [as Ni]SINGSAMP report only all year
SLLNickel, sludge, total, dry weight [as Ni]MAXIMUM <= 420 mg/kg all year
SLLNickel, sludge, total, dry weight [as Ni]M0 <= 420 kg/ha all year
SLLMercury, sludge, total, dry weight [as Hg]SINGSAMP report only all year
SLLMercury, sludge, total, dry weight [as Hg]MAXIMUM <= 57 mg/kg all year
SLLMercury, sludge, total, dry weight [as Hg]M0 <= 17 kg/ha all year
SLLPollutant table from 503.13VALUE report only all year
SLLLevel of pathogen requirements achievedM0 report only all year
SLLDescription of pathogen option usedVALUE report only all year
SLLVector attraction reduction alternative usedVALUE report only all year
SLSArsenic, dry weightCA report only all year
SLSArsenic, dry weightSINGSAMP report only all year
SLSUnit w/liner/leachate collection systemVALUE report only all year
SLSUnit boundary to property line distanceVALUE report only all year
SLSNickel, sludge, total, dry weight [as Ni]CA report only all year
SLSNickel, sludge, total, dry weight [as Ni]SINGSAMP report only all year
SLSChromium, sludge, total, dry weight [as Cr]CA report only all year
SLSChromium, sludge, total, dry weight [as Cr]SINGSAMP report only all year
SLSLevel of pathogen requirements achievedSINGSAMP report only all year
SLSDescription of pathogen option usedVALUE report only all year
SLSVector attraction reduction alternative usedVALUE report only all year
TX1pHMINIMUM report only all year
TX1pHMAXIMUM report only all year
TX1Nitrogen, ammonia total [as N]DAILY MN report only all year
TX1Nitrogen, ammonia total [as N]MO AVG report only all year
TX1Nitrogen, ammonia total [as N]DAILY MX report only all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole Effluent Toxicity [WET] - C. dubia7 DA MIN >= 100 % all year
TX1Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX1%Mortality 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1%Mortality Static Renewal 7Day Chronic Pimephales Promelas7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX2pHMINIMUM report only all year
TX2pHMAXIMUM report only all year
TX2Nitrogen, ammonia total [as N]DAILY MN report only all year
TX2Nitrogen, ammonia total [as N]MO AVG report only all year
TX2Nitrogen, ammonia total [as N]DAILY MX report only all year
TX2Whole effluent toxicity - retest #17 DA MIN report only all year
TX2Whole effluent toxicity - retest #27 DA MIN report only all year
TX2Whole Effluent Toxicity [WET] - C. dubia7 DA MIN >= 100 % all year
TX2Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX2%Mortality 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2%Mortality Static Renewal 7Day Chronic Pimephales Promelas7 DA MIN report only all year
TX2Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX3pHMINIMUM report only all year
TX3pHMAXIMUM report only all year
TX3Nitrogen, ammonia total [as N]DAILY MN report only all year
TX3Nitrogen, ammonia total [as N]MO AVG report only all year
TX3Nitrogen, ammonia total [as N]DAILY MX report only all year
TX3Whole effluent toxicity - retest #17 DA MIN report only all year
TX3Whole effluent toxicity - retest #27 DA MIN report only all year
TX3Whole Effluent Toxicity [WET] - C. dubia7 DA MIN >= 100 % all year
TX3Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TX3%Mortality 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3%Mortality Static Renewal 7Day Chronic Pimephales Promelas7 DA MIN report only all year
TX3Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year

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