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El Dorado, City of - Ouachita Joint Pipeline

Sewerage Systems, major discharger, El Dorado, Arkansas. NPDES permit AR0050296 expired Feb 28, 2026; its limits still apply. Last 12 months: over a limit 37 times (last August 2026), 5 required values missing, 2 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 010R form A monthly (51 values), outfall TX10 form A monthly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
42 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 37 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum140 mg/L≤ 12 mg/L1067%
October 2025Nitrogen, ammonia total [as N], daily maximum5729.41 lb/d≤ 1992.9 lb/d187%
October 2025Nitrogen, ammonia total [as N], monthly average2509.44 lb/d≤ 1328.6 lb/d89%
October 2025Nitrogen, ammonia total [as N], monthly average54.7 mg/L≤ 8 mg/L584%
November 2025Nitrogen, ammonia total [as N], daily maximum160 mg/L≤ 29 mg/L452%
November 2025Nitrogen, ammonia total [as N], daily maximum6355.564 lb/d≤ 4845.1 lb/d31%
November 2025Nitrogen, ammonia total [as N], monthly average67.357 mg/L≤ 19.4 mg/L247%
December 2025Nitrogen, ammonia total [as N], daily maximum120 mg/L≤ 29 mg/L314%
December 2025Nitrogen, ammonia total [as N], daily maximum6546.23 lb/d≤ 4845.1 lb/d35%
December 2025Nitrogen, ammonia total [as N], monthly average57.32 mg/L≤ 19.4 mg/L195%
January 2026Nitrogen, ammonia total [as N], daily maximum90 mg/L≤ 29 mg/L210%
January 2026Nitrogen, ammonia total [as N], monthly average56.613 mg/L≤ 19.4 mg/L192%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum32 mg/L≤ 30.2 mg/L6%
February 2026Nitrogen, ammonia total [as N], daily maximum14091.85 lb/d≤ 4845.1 lb/d191%
February 2026Nitrogen, ammonia total [as N], daily maximum190 mg/L≤ 29 mg/L555%
February 2026Nitrogen, ammonia total [as N], monthly average4145.4 lb/d≤ 3230.1 lb/d28%
February 2026Nitrogen, ammonia total [as N], monthly average76.36 mg/L≤ 19.4 mg/L294%
March 2026Nitrogen, ammonia total [as N], daily maximum100 mg/L≤ 29 mg/L245%
March 2026Nitrogen, ammonia total [as N], monthly average48.73 mg/L≤ 19.4 mg/L151%
April 2026Nitrogen, ammonia total [as N], daily maximum180 mg/L≤ 29 mg/L521%
April 2026Nitrogen, ammonia total [as N], monthly average70.793 mg/L≤ 19.4 mg/L265%
May 2026Nitrogen, ammonia total [as N], daily maximum180 mg/L≤ 12 mg/L1400%
May 2026Nitrogen, ammonia total [as N], daily maximum9327.46 lb/d≤ 1992.9 lb/d368%
May 2026Nitrogen, ammonia total [as N], monthly average4356.55 lb/d≤ 1328.6 lb/d228%
May 2026Nitrogen, ammonia total [as N], monthly average88.013 mg/L≤ 8 mg/L1000%
June 2026Nitrogen, ammonia total [as N], daily maximum170 mg/L≤ 12 mg/L1317%
June 2026Nitrogen, ammonia total [as N], daily maximum6988.34 lb/d≤ 1992.9 lb/d251%
June 2026Nitrogen, ammonia total [as N], monthly average3893.19 lb/d≤ 1328.6 lb/d193%
June 2026Nitrogen, ammonia total [as N], monthly average72.7 mg/L≤ 8 mg/L809%
July 2026Nitrogen, ammonia total [as N], daily maximum10914.72 lb/d≤ 1992.9 lb/d448%
July 2026Nitrogen, ammonia total [as N], daily maximum190 mg/L≤ 12 mg/L1483%
July 2026Nitrogen, ammonia total [as N], monthly average4153.26 lb/d≤ 1328.6 lb/d213%
July 2026Nitrogen, ammonia total [as N], monthly average86.95 mg/L≤ 8 mg/L987%
August 2026Nitrogen, ammonia total [as N], daily maximum110 mg/L≤ 12 mg/L817%
August 2026Nitrogen, ammonia total [as N], daily maximum3991.92 lb/d≤ 1992.9 lb/d100%
August 2026Nitrogen, ammonia total [as N], monthly average2449.29 lb/d≤ 1328.6 lb/d84%
August 2026Nitrogen, ammonia total [as N], monthly average67.48 mg/L≤ 8 mg/L744%

Limits in force (73)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 2 mg/Lall year010R
pHminimum≥ 6 SUall year010R
pHmaximum≤ 9 SUall year010R
Solids, total suspendedmonthly average≤ 5004 lb/dall year010R
Solids, total suspendeddaily maximum≤ 7506 lb/dall year010R
Oil & Greasemonthly average≤ 1668 lb/dall year010R
Oil & Greasedaily maximum≤ 2502 lb/dall year010R
Nitrogen, ammonia total [as N]monthly average≤ 19.4 mg/LJan, Feb, Mar, Apr, Nov, Dec010R
Nitrogen, ammonia total [as N]monthly average≤ 8 mg/LMay–Oct010R
Nitrogen, ammonia total [as N]daily maximum≤ 29 mg/LJan, Feb, Mar, Apr, Nov, Dec010R
Nitrogen, ammonia total [as N]daily maximum≤ 12 mg/LMay–Oct010R
Nitrogen, ammonia total [as N]monthly average≤ 3230.1 lb/dJan, Feb, Mar, Apr, Nov, Dec010R
Nitrogen, ammonia total [as N]monthly average≤ 1328.6 lb/dMay–Oct010R
Nitrogen, ammonia total [as N]daily maximum≤ 4845.1 lb/dJan, Feb, Mar, Apr, Nov, Dec010R
Nitrogen, ammonia total [as N]daily maximum≤ 1992.9 lb/dMay–Oct010R
Phosphorus, total [as P]monthly average≤ 1 mg/LJan, Feb, Mar, Apr, May, Jun, Nov, Dec010R
Phosphorus, total [as P]monthly average≤ .7 mg/LJul–Oct010R
Phosphorus, total [as P]daily maximum≤ 2 mg/LJan, Feb, Mar, Apr, May, Jun, Nov, Dec010R
Phosphorus, total [as P]daily maximum≤ 1.4 mg/LJul–Oct010R
Phosphorus, total [as P]monthly average≤ 166.8 lb/dJan, Feb, Mar, Apr, May, Jun, Nov, Dec010R
Phosphorus, total [as P]monthly average≤ 116.7 lb/dJul–Oct010R
Phosphorus, total [as P]daily maximum≤ 333.6 lb/dJan, Feb, Mar, Apr, May, Jun, Nov, Dec010R
Phosphorus, total [as P]daily maximum≤ 233.5 lb/dJul–Oct010R
Chloride [as Cl]monthly averagereport only (mg/L)all year010R
Chloride [as Cl]daily maximumreport only (mg/L)all year010R
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year010R
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year010R
Selenium, total recoverablemonthly average≤ 6.58 lb/dall year010R
Selenium, total recoverabledaily maximum≤ 13.2 lb/dall year010R
Nickel, total recoverablemonthly average≤ 142.3 lb/dall year010R
Nickel, total recoverabledaily maximum≤ 285.52 lb/dall year010R
Silver total recoverablemonthly average≤ .78 lb/dall year010R
Silver total recoverabledaily maximum≤ 1.56 lb/dall year010R
Zinc, total recoverablemonthly average≤ 73.52 lb/dall year010R
Zinc, total recoverabledaily maximum≤ 147.51 lb/dall year010R
Cadmium, total recoverablemonthly average≤ 2.22 lb/dall year010R
Cadmium, total recoverabledaily maximum≤ 4.46 lb/dall year010R
Lead, total recoverablemonthly average≤ 3.99 lb/dall year010R
Lead, total recoverabledaily maximum≤ 8.01 lb/dall year010R
Copper, total recoverablemonthly average≤ 8.23 lb/dall year010R
Copper, total recoverabledaily maximum≤ 16.51 lb/dall year010R
Chromium, hexavalent dissolved [as Cr]monthly average≤ 9.62 lb/dall year010R
Chromium, hexavalent dissolved [as Cr]daily maximum≤ 19.3 lb/dall year010R
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year010R
Flow, in conduit or thru treatment plantdaily maximum≤ 20 MGDall year010R
Chromium IIImonthly average≤ 395.16 lb/dall year010R
Chromium IIIdaily maximum≤ 792.86 lb/dall year010R
Solids, total dissolvedmonthly averagereport only (mg/L)all year010R
Solids, total dissolveddaily maximumreport only (mg/L)all year010R
Mercury, total recoverablemonthly average≤ .015 lb/dall year010R
Mercury, total recoverabledaily maximum≤ .032 lb/dall year010R
Coliform, fecal general30-day geometric meanreport only (#/100mL)all year010R
Coliform, fecal general7-day geometric meanreport only (#/100mL)all year010R
Cyanide, total recoverablemonthly average≤ 6.84 lb/dall year010R
Cyanide, total recoverabledaily maximum≤ 13.73 lb/dall year010R
BOD, carbonaceous [5 day, 20 C]monthly average≤ 17.5 mg/LMay–Oct010R
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20.1 mg/LJan, Feb, Mar, Apr, Nov, Dec010R
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 26.3 mg/LMay–Oct010R
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30.2 mg/LJan, Feb, Mar, Apr, Nov, Dec010R
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2923.2 lb/dMay–Oct010R
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3356.9 lb/dJan, Feb, Mar, Apr, Nov, Dec010R
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4384.8 lb/dMay–Oct010R
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5035.3 lb/dJan, Feb, Mar, Apr, Nov, Dec010R
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX10
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX10
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (pass=0;fail=1)all yearTX10
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (pass=0;fail=1)all yearTX10
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX10
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX10
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX10
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX10
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7-day averagereport only (%)all yearTX10
Coef Of Var Static Renewal 7Day Chronic Pimephales promelas7-day averagereport only (%)all yearTX10

How strict are these limits?

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

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