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El Dorado, City of - South Plant

Sewage treatment plant, major discharger, El Dorado, Arkansas. NPDES permit AR0033723, in force until Dec 31, 2028. Last 12 months: over a limit 10 times (last August 2026), 5 of 81 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form A monthly (27 values), outfall 001 form B8 monthly (3 values), outfall 001 form C8 monthly (3 values), outfall 010S form A monthly (48 values), outfall TX1 form Q quarterly (8 values), outfall TX1S form Q quarterly (16 values), and 2 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 87 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, daily maximum94 mg/L≤ 45 mg/L109%
October 2025Solids, total suspended, monthly average< 30.65 mg/L≤ 30 mg/L2%
November 2025Solids, total suspended, daily maximum110 mg/L≤ 45 mg/L144%
November 2025Solids, total suspended, monthly average< 32.94 mg/L≤ 30 mg/L10%
February 2026Solids, total suspended, daily maximum70 mg/L≤ 45 mg/L56%
April 2026Solids, total suspended, daily maximum49 mg/L≤ 45 mg/L9%
June 2026Solids, total suspended, daily maximum100 mg/L≤ 45 mg/L122%
July 2026Solids, total suspended, daily maximum110 mg/L≤ 45 mg/L144%
July 2026Solids, total suspended, daily maximum4027.39 lb/d≤ 2627.1 lb/d53%
August 2026Solids, total suspended, daily maximum68 mg/L≤ 45 mg/L51%

Limits in force (223)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrade7-day averagereport only (deg C)Apr, May001
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Oxygen, dissolved [DO]monthly average minimum≥ 3 mg/LMay–Oct001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/LMay–Oct001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspended7-day average≤ 22.5 mg/LMay–Oct001
Solids, total suspended7-day average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 875.7 lb/dMay–Oct001
Solids, total suspendedmonthly average≤ 1751.4 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 10.2 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 10.2 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 9.73 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 8.55 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 6.6 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.08 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 5.8 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 6.23 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 17 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 6.1 mg/LJun–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 5.03 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 4.42 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 4.74 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 3.89 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 4.17 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 3.42 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 3.66 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 3.22 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 2.64 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 2.83 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 2.32 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 2.49 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 6.8 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LJun–Oct001
Nitrogen, ammonia total [as N]7-day average≤ 10.2 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 10.2 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 9.73 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 8.55 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 6.6 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.08 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 5.8 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 6.23 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 17 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]7-day average≤ 6.1 mg/LJun–Oct001
Nitrogen, ammonia total [as N]7-day average≤ 12.58 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 11.05 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 9.73 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 8.55 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 6.6 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 7.08 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 5.8 mg/LApr001
Nitrogen, ammonia total [as N]7-day average≤ 6.23 mg/LMay001
Nitrogen, ammonia total [as N]7-day average≤ 17 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]7-day average≤ 6.1 mg/LJun–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 595.5 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 437.9 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 595.5 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 437.9 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 568.1 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 437.9 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 499.2 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 437.9 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 437.9 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 437.9 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 385.3 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 413.3 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 338.6 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 363.7 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 992.5 lb/dJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 356.1 lb/dJun–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 293.7 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 291.9 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 258 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 276.7 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 227.1 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 243.4 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 199.7 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 213.7 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 175.1 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 188 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 154.1 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 165.2 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 135.4 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 145.4 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 397 lb/dJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 140.2 lb/dJun–Oct001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]7-day averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year001
Selenium, total recoverablemonthly average≤ 5.58 ug/Lall year001
Selenium, total recoverable7-day average≤ 11.2 ug/Lall year001
Selenium, total recoverablemonthly average≤ .33 lb/dall year001
Copper, total recoverablemonthly average≤ 12.2 ug/Lall year001
Copper, total recoverable7-day average≤ 24.48 ug/Lall year001
Copper, total recoverablemonthly average≤ .71 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
Mercury, total recoverablemonthly averagereport only (ug/L)all year001
Mercury, total recoverable7-day averagereport only (ug/L)all year001
Mercury, total recoverablemonthly averagereport only (lb/d)all year001
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep001
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep001
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Overflowsmonthly totalreport only (occur/mo)all year001
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year001
Cyanide, total recoverablemonthly average≤ 5.8 ug/Lall year001
Cyanide, total recoverable7-day average≤ 11.64 ug/Lall year001
Cyanide, total recoverablemonthly average≤ .34 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 37.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1459.5 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 583.8 lb/dMay–Oct001
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year010S
pHminimum≥ 6 SUall year010S
pHmaximum≤ 9 SUall year010S
Solids, total suspendedmonthly average≤ 30 mg/Lall year010S
Solids, total suspendeddaily maximum≤ 45 mg/Lall year010S
Solids, total suspendedmonthly average≤ 1751.4 lb/dall year010S
Solids, total suspendeddaily maximum≤ 2627.1 lb/dall year010S
Oil & Greasemonthly average≤ 583.8 lb/dall year010S
Oil & Greasedaily maximum≤ 875.7 lb/dall year010S
Nitrogen, ammonia total [as N]monthly average≤ 496.3 lb/dMay–Oct010S
Nitrogen, ammonia total [as N]monthly average≤ 1605.5 lb/dJan, Feb, Mar, Apr, Nov, Dec010S
Nitrogen, ammonia total [as N]daily maximum≤ 624 lb/dMay–Oct010S
Nitrogen, ammonia total [as N]daily maximum≤ 2287 lb/dJan, Feb, Mar, Apr, Nov, Dec010S
Phosphorus, total [as P]monthly averagereport only (mg/L)all year010S
Phosphorus, total [as P]daily maximumreport only (mg/L)all year010S
Chloride [as Cl]monthly averagereport only (mg/L)all year010S
Chloride [as Cl]daily maximumreport only (mg/L)all year010S
Selenium, total recoverablemonthly average≤ 2.3 lb/dall year010S
Selenium, total recoverabledaily maximum≤ 4.62 lb/dall year010S
Nickel, total recoverablemonthly average≤ 49.81 lb/dall year010S
Nickel, total recoverabledaily maximum≤ 99.93 lb/dall year010S
Silver total recoverablemonthly average≤ .27 lb/dall year010S
Silver total recoverabledaily maximum≤ .55 lb/dall year010S
Zinc, total recoverablemonthly average≤ 25.73 lb/dall year010S
Zinc, total recoverabledaily maximum≤ 51.63 lb/dall year010S
Cadmium, total recoverablemonthly average≤ .78 lb/dall year010S
Cadmium, total recoverabledaily maximum≤ 1.56 lb/dall year010S
Lead, total recoverablemonthly average≤ 1.4 lb/dall year010S
Lead, total recoverabledaily maximum≤ 2.8 lb/dall year010S
Copper, total recoverablemonthly average≤ 2.88 lb/dall year010S
Copper, total recoverabledaily maximum≤ 5.78 lb/dall year010S
Chromium, hexavalent dissolved [as Cr]monthly average≤ 3.37 lb/dall year010S
Chromium, hexavalent dissolved [as Cr]daily maximum≤ 6.76 lb/dall year010S
Chromium, trivalent total recoverablemonthly average≤ 138.31 lb/dall year010S
Chromium, trivalent total recoverabledaily maximum≤ 277.5 lb/dall year010S
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year010S
Flow, in conduit or thru treatment plantdaily maximum≤ 7 MGDall year010S
Solids, total dissolvedmonthly averagereport only (mg/L)all year010S
Solids, total dissolveddaily maximumreport only (mg/L)all year010S
Mercury, total recoverabledaily maximum< .19 ug/Lall year010S
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep010S
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec010S
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep010S
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec010S
Cyanide, total recoverablemonthly average≤ 2.39 lb/dall year010S
Cyanide, total recoverabledaily maximum≤ 4.81 lb/dall year010S
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec010S
BOD, carbonaceous [5 day, 20 C]monthly average≤ 22.5 mg/LMay–Oct010S
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 39 mg/LJan, Feb, Mar, Apr, Nov, Dec010S
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 33.8 mg/LMay–Oct010S
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1323.47 lb/dJan, Feb, Mar, Apr, Nov, Dec010S
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1119.17 lb/dMay–Oct010S
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1985.15 lb/dJan, Feb, Mar, Apr, Nov, Dec010S
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1678.75 lb/dMay–Oct010S
Sulfatemonthly averagereport only (mg/L)all year010S
Sulfatedaily maximumreport only (mg/L)all year010S
WET, sublethal retest #17-day averagereport only (pass=0;fail=1)all yearTX1
WET, sublethal retest #27-day averagereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity, Sub-Lethal Retest #37-day averagereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity [WET] - C. dubia7-day average< 100 %all yearTX1
Whole Effluent Toxicity [WET] - C. dubia7-day average< 80 %all yearTX1
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX1
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1S
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all yearTX1S
WET, sublethal retest #17-day minimumreport only (pass=0;fail=1)all yearTX1S
WET, sublethal retest #27-day minimumreport only (pass=0;fail=1)all yearTX1S
Whole Effluent Toxicity - Retest #37-day minimumreport only (pass=0;fail=1)all yearTX1S
Whole Effluent Toxicity, Sub-Lethal Retest #37-day minimumreport only (pass=0;fail=1)all yearTX1S
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1S
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1S
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1S
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1S
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1S
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1S
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1S
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1S
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1S
Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1S

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/AR0033723 · MCP: https://passage-data.com/mcp