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Sewage treatment plant, major discharger, Mobile, Alabama. NPDES permit AL0023086 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit 33 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Enterococci: group D, MF trans, M-E, EIA, monthly average | 86 | ≤ 35 #/100mL | 146% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 27.97 | ≤ 20 mg/L | 40% |
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 30.02 | ≤ 20 mg/L | 50% |
| November 2025 | Nitrogen, ammonia total [as N], weekly average | 34.47 | ≤ 30 mg/L | 15% |
| December 2025 | Enterococci: group D, MF trans, M-E, EIA, daily maximum | 299 | ≤ 275 #/100mL | 9% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 28.34 | ≤ 20 mg/L | 42% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 4865 | ≤ 4670 lb/d | 4% |
| December 2025 | Nitrogen, ammonia total [as N], weekly average | 33.31 | ≤ 30 mg/L | 11% |
| December 2025 | Nitrogen, ammonia total [as N], weekly average | 7433 | ≤ 7005 lb/d | 6% |
| December 2025 | Solids, total suspended, weekly average | 47 | ≤ 45 mg/L | 4% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 30.31 | ≤ 20 mg/L | 52% |
| January 2026 | Nitrogen, ammonia total [as N], weekly average | 32.11 | ≤ 30 mg/L | 7% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 28.81 | ≤ 20 mg/L | 44% |
| February 2026 | Nitrogen, ammonia total [as N], weekly average | 30.26 | ≤ 30 mg/L | 1% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 28.51 | ≤ 20 mg/L | 43% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 31.34 | ≤ 20 mg/L | 57% |
| April 2026 | Nitrogen, ammonia total [as N], weekly average | 34.3 | ≤ 30 mg/L | 14% |
| May 2026 | Enterococci: group D, MF trans, M-E, EIA, daily maximum | 201 | ≤ 158 #/100mL | 27% |
| May 2026 | Enterococci: group D, MF trans, M-E, EIA, monthly average | 50.82 | ≤ 35 #/100mL | 45% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 22.24 | ≤ 20 mg/L | 11% |
| May 2026 | Solids, total suspended, weekly average | 12453 | ≤ 10508 lb/d | 19% |
| June 2026 | Solids, suspended percent removal, monthly average minimum | 76.78 | ≥ 85 % | 55% |
| June 2026 | Solids, total suspended, monthly average | 13017 | ≤ 7005 lb/d | 86% |
| June 2026 | Solids, total suspended, monthly average | 59 | ≤ 30 mg/L | 97% |
| June 2026 | Solids, total suspended, weekly average | 108 | ≤ 45 mg/L | 140% |
| June 2026 | Solids, total suspended, weekly average | 36960 | ≤ 10508 lb/d | 252% |
| June 2026 | pH, daily minimum | 5.84 | ≥ 6 SU | — |
| July 2026 | Enterococci: group D, MF trans, M-E, EIA, daily maximum | 259.5 | ≤ 158 #/100mL | 64% |
| July 2026 | Enterococci: group D, MF trans, M-E, EIA, monthly average | 57.65 | ≤ 35 #/100mL | 65% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 27.29 | ≤ 20 mg/L | 36% |
| July 2026 | Solids, total suspended, weekly average | 56.32 | ≤ 45 mg/L | 25% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 27.72 | ≤ 20 mg/L | 39% |
| August 2026 | Nitrogen, ammonia total [as N], weekly average | 30.86 | ≤ 30 mg/L | 3% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 3 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 7005 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 10508 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 30 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4670 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7005 lb/d | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | weekly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | weekly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrite + Nitrate total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | all year | 001 |
| Enterococci: group D, MF trans, M-E, EIA | monthly average | ≤ 35 #/100mL | May–Oct | 001 |
| Enterococci: group D, MF trans, M-E, EIA | monthly average | report only (#/100mL) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | ≤ 158 #/100mL | May–Oct | 001 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | ≤ 275 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .036 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .04 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 37.5 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 5838 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 8757 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | all year | 001 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Pass/Fail Static Chronic Arbacia punctulata | single sample | ≤ 0 pass=0;fail=1 | Mar, Jun, Sep, Dec | 001 |
| Pass/Fail Static Renewal 7Day Chronic Cyprinodon variegatus | single sample | ≤ 0 pass=0;fail=1 | Mar, Jun, Sep, Dec | 001 |
| pH | daily minimum | report only (SU) | all year | 002 |
| pH | daily maximum | report only (SU) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | report only (#/100mL) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 002 |
| pH | daily minimum | report only (SU) | all year | 003 |
| pH | daily maximum | report only (SU) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | report only (#/100mL) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 003 |
Cited limits by parameter: Alabama's rules and the federal ones.
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