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Sewage treatment plant, major discharger, Gulf Shores, Alabama. NPDES permit AL0055841, in force until Jan 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | = 6 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 | ≤ 1000 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 1501 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 | ≤ 1 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.5 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 33.3 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 50 lb/d | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | ≤ 3 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | weekly average | ≤ 4.5 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | ≤ 100 lb/d | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | weekly average | ≤ 150 lb/d | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 15 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 333 lb/d | all year | 001 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 500 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 | report only (#/100mL) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Enterococci: group D, MF trans, M-E, EIA | monthly average | ≤ 35 #/100mL | May–Oct | 001 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | ≤ 275 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | ≤ 158 #/100mL | May–Oct | 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 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 6 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 133 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 200 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 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | single sample | ≤ 0 pass=0;fail=1 | Oct | 001 |
| Pass/Fail Static 48Hr Acute Cyprinodon variegatus | single sample | ≤ 0 pass=0;fail=1 | Oct | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 003 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 1000 lb/d | all year | 003 |
| Solids, total suspended | weekly average | ≤ 1501 lb/d | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 003 |
| Solids, total suspended | weekly average | report only (lb/d) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.5 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 33.3 lb/d | all year | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 50 lb/d | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | ≤ 3 mg/L | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | weekly average | ≤ 4.5 mg/L | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | ≤ 100 lb/d | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | weekly average | ≤ 150 lb/d | all year | 003 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | 003 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 15 mg/L | all year | 003 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 333 lb/d | all year | 003 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 500 lb/d | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 003 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | all year | 003 |
| Enterococci: group D, MF trans, M-E, EIA | monthly average | ≤ 35 #/100mL | May–Oct | 003 |
| Enterococci: group D, MF trans, M-E, EIA | monthly average | report only (#/100mL) | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | ≤ 158 #/100mL | May–Oct | 003 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | ≤ 275 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 6 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 133 lb/d | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 200 lb/d | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | all year | 003 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| pH | daily minimum | report only (SU) | all year | 004 |
| pH | daily maximum | report only (SU) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | report only (#/100mL) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 004 |
Cited limits by parameter: Alabama's rules and the federal ones.
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