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Ardmore, City of

Sewage treatment plant, major discharger, Ardmore, Oklahoma. NPDES permit OK0038440, in force until Apr 30, 2029. Last 12 months: over a limit 76 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 50 days after each period: outfall 001 form A monthly (23 values), outfall TX1 form Q quarterly (19 values), outfall 001 form Y yearly, outfall SLD form F yearly, outfall SLD form P yearly, outfall SLL form A yearly, and 1 more form
Last report on file
August 2026
Oct 2024 – Sep 2025
69 values over a limit, 0 required values missing, 5 of 21 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 76 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average12 mg/L≤ 5 mg/L140%
October 2025BOD, carbonaceous [5 day, 20 C], weekly average16.4 mg/L≤ 7.5 mg/L119%
October 2025Nitrogen, ammonia total [as N], monthly average22.9 mg/L≤ 1 mg/L2190%
October 2025Nitrogen, ammonia total [as N], monthly average439 lb/d≤ 49.2 lb/d792%
October 2025Nitrogen, ammonia total [as N], weekly average24.5 mg/L≤ 1.5 mg/L1533%
October 2025Solids, total suspended, monthly average20.5 mg/L≤ 15 mg/L37%
October 2025Solids, total suspended, weekly average26.6 mg/L≤ 22.5 mg/L18%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average16 mg/L≤ 10 mg/L60%
November 2025BOD, carbonaceous [5 day, 20 C], weekly average19.6 mg/L≤ 15 mg/L31%
November 2025E. coli, daily maximum> 2419.6 MPN/100mL≤ 2030 MPN/100mL—
November 2025Nitrogen, ammonia total [as N], monthly average24.6 mg/L≤ 2.5 mg/L884%
November 2025Nitrogen, ammonia total [as N], monthly average504 lb/d≤ 123 lb/d310%
November 2025Nitrogen, ammonia total [as N], weekly average28.6 mg/L≤ 3.8 mg/L653%
November 2025Solids, total suspended, monthly average25 mg/L≤ 15 mg/L67%
November 2025Solids, total suspended, weekly average30.5 mg/L≤ 22.5 mg/L36%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average18 mg/L≤ 10 mg/L80%
December 2025BOD, carbonaceous [5 day, 20 C], weekly average25 mg/L≤ 15 mg/L67%
December 2025Nitrogen, ammonia total [as N], monthly average23.7 mg/L≤ 2.5 mg/L848%
December 2025Nitrogen, ammonia total [as N], monthly average489 lb/d≤ 123 lb/d298%
December 2025Nitrogen, ammonia total [as N], weekly average25.1 mg/L≤ 3.8 mg/L561%
December 2025Solids, total suspended, monthly average42 mg/L≤ 15 mg/L180%
December 2025Solids, total suspended, monthly average850.98 lb/d≤ 738.1 lb/d15%
December 2025Solids, total suspended, weekly average67.1 mg/L≤ 22.5 mg/L198%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average24 mg/L≤ 10 mg/L140%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average532.1 lb/d≤ 492.1 lb/d8%
January 2026BOD, carbonaceous [5 day, 20 C], weekly average32 mg/L≤ 15 mg/L113%
January 2026E. coli, daily maximum2419.6 MPN/100mL≤ 2030 MPN/100mL19%
January 2026Nitrogen, ammonia total [as N], monthly average23.3 mg/L≤ 2.5 mg/L832%
January 2026Nitrogen, ammonia total [as N], monthly average496 lb/d≤ 123 lb/d303%
January 2026Nitrogen, ammonia total [as N], weekly average26.9 mg/L≤ 3.8 mg/L608%
January 2026Solids, total suspended, monthly average2044.7 lb/d≤ 738.1 lb/d177%
January 2026Solids, total suspended, monthly average89 mg/L≤ 15 mg/L493%
January 2026Solids, total suspended, weekly average139 mg/L≤ 22.5 mg/L518%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average20 mg/L≤ 10 mg/L100%
February 2026BOD, carbonaceous [5 day, 20 C], weekly average22 mg/L≤ 15 mg/L47%
February 2026Nitrogen, ammonia total [as N], monthly average18.5 mg/L≤ 2.5 mg/L640%
February 2026Nitrogen, ammonia total [as N], monthly average385 lb/d≤ 123 lb/d213%
February 2026Nitrogen, ammonia total [as N], weekly average21.3 mg/L≤ 3.8 mg/L461%
February 2026Solids, total suspended, monthly average1767.4 lb/d≤ 738.1 lb/d139%
February 2026Solids, total suspended, monthly average82.2 mg/L≤ 15 mg/L448%
February 2026Solids, total suspended, weekly average123.6 mg/L≤ 22.5 mg/L449%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average25 mg/L≤ 10 mg/L150%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average559.8 lb/d≤ 492.1 lb/d14%
March 2026BOD, carbonaceous [5 day, 20 C], weekly average30 mg/L≤ 15 mg/L100%
March 2026Nitrogen, ammonia total [as N], monthly average18.2 mg/L≤ 2.5 mg/L628%
March 2026Nitrogen, ammonia total [as N], monthly average396 lb/d≤ 123 lb/d222%
March 2026Nitrogen, ammonia total [as N], weekly average22.3 mg/L≤ 3.8 mg/L487%
March 2026Solids, total suspended, monthly average2076.5 lb/d≤ 738.1 lb/d181%
March 2026Solids, total suspended, monthly average89 mg/L≤ 15 mg/L493%
March 2026Solids, total suspended, weekly average110.4 mg/L≤ 22.5 mg/L391%
April 2026Nitrogen, ammonia total [as N], monthly average13 mg/L≤ 1 mg/L1200%
April 2026Nitrogen, ammonia total [as N], monthly average357.7 lb/d≤ 49.2 lb/d627%
April 2026Nitrogen, ammonia total [as N], weekly average17.3 mg/L≤ 1.5 mg/L1053%
May 2026Nitrogen, ammonia total [as N], monthly average207.3 lb/d≤ 49.2 lb/d321%
May 2026Nitrogen, ammonia total [as N], monthly average8 mg/L≤ 1 mg/L700%
May 2026Nitrogen, ammonia total [as N], weekly average13.1 mg/L≤ 1.5 mg/L773%
May 2026Solids, total suspended, weekly average23.4 mg/L≤ 22.5 mg/L4%
June 2026Nitrogen, ammonia total [as N], monthly average138.8 lb/d≤ 49.2 lb/d182%
June 2026Nitrogen, ammonia total [as N], monthly average6 mg/L≤ 1 mg/L500%
June 2026Nitrogen, ammonia total [as N], weekly average12.9 mg/L≤ 1.5 mg/L760%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average7 mg/L≤ 5 mg/L40%
July 2026BOD, carbonaceous [5 day, 20 C], weekly average9.8 mg/L≤ 7.5 mg/L31%
July 2026Nitrogen, ammonia total [as N], monthly average10 mg/L≤ 1 mg/L900%
July 2026Nitrogen, ammonia total [as N], monthly average231.9 lb/d≤ 49.2 lb/d371%
July 2026Nitrogen, ammonia total [as N], weekly average11.8 mg/L≤ 1.5 mg/L687%
July 2026Solids, total suspended, monthly average1293.72 lb/d≤ 738.1 lb/d75%
July 2026Solids, total suspended, monthly average55 mg/L≤ 15 mg/L267%
July 2026Solids, total suspended, weekly average97.6 mg/L≤ 22.5 mg/L334%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average7 mg/L≤ 5 mg/L40%
August 2026BOD, carbonaceous [5 day, 20 C], weekly average9.7 mg/L≤ 7.5 mg/L29%
August 2026Nitrogen, ammonia total [as N], monthly average4.3 mg/L≤ 1 mg/L330%
August 2026Nitrogen, ammonia total [as N], monthly average76.8 lb/d≤ 49.2 lb/d56%
August 2026Nitrogen, ammonia total [as N], weekly average5.7 mg/L≤ 1.5 mg/L280%
August 2026Solids, total suspended, monthly average1090.8 lb/d≤ 738.1 lb/d48%
August 2026Solids, total suspended, monthly average60 mg/L≤ 15 mg/L300%
August 2026Solids, total suspended, weekly average74.7 mg/L≤ 22.5 mg/L232%

Limits in force (108)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 5.5 mg/LJun–Oct001
Oxygen, dissolved [DO]monthly minimum≥ 7 mg/LJan, Feb, Mar, Nov, Dec001
Oxygen, dissolved [DO]monthly minimum≥ 6.5 mg/LApr, May001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedweekly average≤ 22.5 mg/Lall year001
Solids, total suspendedmonthly average≤ 738.1 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LApr–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.5 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 1.5 mg/LApr–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 49.2 lb/dApr–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 123 lb/dJan, Feb, Mar, Nov, Dec001
Cadmium, total [as Cd]monthly average≤ 4 ug/Lall year001
Cadmium, total [as Cd]daily maximum≤ 6.92 ug/Lall year001
Cadmium, total [as Cd]monthly average≤ .2 lb/dall year001
Copper, total [as Cu]monthly average≤ 27.54 ug/Lall year001
Copper, total [as Cu]daily maximum≤ 41.31 ug/Lall year001
Copper, total [as Cu]monthly average≤ 1.36 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualinstantaneous maximum≤ .099 mg/Lall year001
E. coligeometric mean≤ 126 MPN/100mLMay–Sep001
E. coligeometric mean≤ 630 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colidaily maximum≤ 406 MPN/100mLMay–Sep001
E. colidaily maximum≤ 2030 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Mercury, total [as Hg]monthly average≤ 1.22 ug/Lall year001
Mercury, total [as Hg]daily maximum≤ 1.79 ug/Lall year001
Mercury, total [as Hg]monthly average≤ .06 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/LApr–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LJan, Feb, Mar, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 7.5 mg/LApr–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 492.1 lb/dJan, Feb, Mar, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 246 lb/dApr–Oct001
Toxicity characteristic leaching proceduremonthly average minimumreport only (pass=0;fail=1)all yearSLD
Ann. amt sludge disposed by other methodannual totalreport only (DMT/y)all yearSLD
Annual amt of sludge incineratedannual totalreport only (DMT/y)all yearSLD
Annual sludge production, totalannual totalreport only (DMT/y)all yearSLD
Annual amount of sludge land appliedannual totalreport only (DMT/y)all yearSLD
Annual amt. sludge disposed surface unitannual totalreport only (DMT/y)all yearSLD
Annual amt sludge disposed in landfillannual totalreport only (DMT/y)all yearSLD
Annual amt sludge transported interstateannual totalreport only (DMT/y)all yearSLD
Compliance w/part 258 sludge requirementvaluereport only (N=0;Y=1)all yearSLD
Arsenic, dry weightsingle samplereport only (mg/kg)all yearSLL
Arsenic, dry weightmaximum≤ 75 mg/kgall yearSLL
Arsenic, dry weightmaximum value≤ 41 kg/haall yearSLL
Selenium, dry weightsingle samplereport only (mg/kg)all yearSLL
Selenium, dry weightmaximum≤ 100 mg/kgall yearSLL
Selenium, dry weightmaximum value≤ 100 kg/haall yearSLL
Polychlorinated biphenyls [PCBs]annual maximum≤ 49.99 mg/kgall yearSLL
Copper, dry weightsingle samplereport only (mg/kg)all yearSLL
Copper, dry weightmaximum≤ 4300 mg/kgall yearSLL
Copper, dry weightmaximum value≤ 1500 kg/haall yearSLL
Cadmium, dry weightsingle samplereport only (mg/kg)all yearSLL
Cadmium, dry weightmaximum≤ 85 mg/kgall yearSLL
Cadmium, dry weightmaximum value≤ 39 kg/haall yearSLL
Annual whole sludge application ratemaximum valuereport only (met t/ha/yr)all yearSLL
Molybdenum, sludge, total, dry weight [as Mo]single samplereport only (mg/kg)all yearSLL
Molybdenum, sludge, total, dry weight [as Mo]maximum≤ 75 mg/kgall yearSLL
Molybdenum, sludge, total, dry weight [as Mo]maximum valuereport only (kg/ha)all yearSLL
Zinc, sludge, total, dry weight [as Zn]single samplereport only (mg/kg)all yearSLL
Zinc, sludge, total, dry weight [as Zn]maximum≤ 7500 mg/kgall yearSLL
Zinc, sludge, total, dry weight [as Zn]maximum value≤ 2800 kg/haall yearSLL
Lead, sludge, total, dry weight [as Pb]single samplereport only (mg/kg)all yearSLL
Lead, sludge, total, dry weight [as Pb]maximum≤ 840 mg/kgall yearSLL
Lead, sludge, total, dry weight [as Pb]maximum value≤ 300 kg/haall yearSLL
Nickel, sludge, total, dry weight [as Ni]single samplereport only (mg/kg)all yearSLL
Nickel, sludge, total, dry weight [as Ni]maximum≤ 420 mg/kgall yearSLL
Nickel, sludge, total, dry weight [as Ni]maximum value≤ 420 kg/haall yearSLL
Mercury, sludge, total, dry weight [as Hg]single samplereport only (mg/kg)all yearSLL
Mercury, sludge, total, dry weight [as Hg]maximum≤ 57 mg/kgall yearSLL
Mercury, sludge, total, dry weight [as Hg]maximum value≤ 17 kg/haall yearSLL
Pollutant table from 503.13valuereport only (table #)all yearSLL
Level of pathogen requirements achievedmaximum valuereport only (state class)all yearSLL
Description of pathogen option usedvaluereport only (alt #)all yearSLL
Vector attraction reduction alternative usedvaluereport only (alt #)all yearSLL
Arsenic, dry weightallowable concentrationreport only (mg/kg)all yearSLS
Arsenic, dry weightsingle samplereport only (mg/kg)all yearSLS
Unit w/liner/leachate collection systemvaluereport only (N=0;Y=1)all yearSLS
Unit boundary to property line distancevaluereport only (m)all yearSLS
Nickel, sludge, total, dry weight [as Ni]allowable concentrationreport only (mg/kg)all yearSLS
Nickel, sludge, total, dry weight [as Ni]single samplereport only (mg/kg)all yearSLS
Chromium, sludge, total, dry weight [as Cr]allowable concentrationreport only (mg/kg)all yearSLS
Chromium, sludge, total, dry weight [as Cr]single samplereport only (mg/kg)all yearSLS
Level of pathogen requirements achievedsingle samplereport only (state class)all yearSLS
Description of pathogen option usedvaluereport only (alt #)all yearSLS
Vector attraction reduction alternative usedvaluereport only (alt #)all yearSLS
pHdaily minimumreport only (SU)all yearTX1
pHdaily maximumreport only (SU)all yearTX1
Nitrogen, ammonia total [as N]daily minimumreport only (mg/L)all yearTX1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearTX1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearTX1
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
%Mortality 7Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
%Mortality Static Renewal 7Day Chronic Pimephales Promelas7-day minimumreport only (%)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1

How strict are these limits?

Cited limits by parameter: Oklahoma's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OK0038440 · MCP: https://passage-data.com/mcp