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Sewage treatment plant, major discharger, Gulfport, Mississippi. NPDES permit MS0051756, in force until Apr 30, 2030. Last 12 months: over a limit 3 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | pH, maximum | 9.4 SU | ≤ 9 SU | — |
| August 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 100.7 lb/d | ≤ 97 lb/d | 4% |
| August 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 2.8 mg/L | ≤ 1.5 mg/L | 87% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 4 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 259 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 388 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | report only (lb/d) | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| pH | minimum | report only (SU) | all year | 001 |
| pH | maximum | report only (SU) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 1939 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 2908 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | maximum weekly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | maximum weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 1141.1 lb/d | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 3109.3 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 1.5 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 65 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 97 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum 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] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 972 lb/d | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1431 lb/d | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ .081 mg/L | all year | 001 |
| Zinc, total recoverable | maximum weekly average | ≤ .09 mg/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ .0031 mg/L | all year | 001 |
| Copper, total recoverable | maximum weekly average | ≤ .0048 mg/L | all year | 001 |
| Enterococci: group D, MF trans, M-E, EIA | monthly average | ≤ 35 #/100mL | all year | 001 |
| Enterococci: group D, MF trans, M-E, EIA | maximum weekly average | ≤ 130 #/100mL | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 7.75 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | maximum weekly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .0075 mg/L | all year | 001 |
| Chlorine, total residual | maximum weekly average | ≤ .013 mg/L | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 001 |
| Sludge settleability 30 minute | minimum | report only (mL/L) | all year | 001 |
| Sludge settleability 30 minute | maximum | report only (mL/L) | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| % Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | minimum | ≥ 100 % | all year | 001 |
| %Effect Static Renewal 7Day Chronic Menidia | minimum | ≥ 100 % | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year | 002 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 002 |
| Oxygen, dissolved [DO] | maximum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 11 mg/L | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 21 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 16.5 mg/L | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 31.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 963 lb/d | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 2802 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1445 lb/d | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 4203 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | report only (lb/d) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| pH | minimum | report only (SU) | all year | 002 |
| pH | maximum | report only (SU) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | May–Oct | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | May–Oct | 002 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | monthly average | ≤ 2627 lb/d | May–Oct | 002 |
| Solids, total suspended | monthly average | ≤ 3995 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | maximum weekly average | ≤ 3941 lb/d | May–Oct | 002 |
| Solids, total suspended | maximum weekly average | ≤ 5993 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | maximum weekly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, total suspended | maximum weekly average | report only (lb/d) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 3.75 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 19 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 219 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2002 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 328 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 2535 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 002 |
| Silver total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Silver total recoverable | maximum weekly average | ≤ .003 mg/L | all year | 002 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Copper, total recoverable | maximum weekly average | ≤ .008 mg/L | all year | 002 |
| Enterococci: group D, MF trans, M-E, EIA | monthly average | ≤ 35 #/100mL | all year | 002 |
| Enterococci: group D, MF trans, M-E, EIA | maximum weekly average | ≤ 130 #/100mL | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 16 MGD | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 10.5 MGD | May–Oct | 002 |
| Flow, in conduit or thru treatment plant | maximum weekly average | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Flow, in conduit or thru treatment plant | maximum weekly average | report only (MGD) | May–Oct | 002 |
| Chlorine, total residual | monthly average | report only (mg/L) | all year | 002 |
| Chlorine, total residual | maximum weekly average | ≤ .022 mg/L | all year | 002 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 002 |
| Sludge settleability 30 minute | minimum | report only (mL/L) | all year | 002 |
| Sludge settleability 30 minute | maximum | report only (mL/L) | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
Cited limits by parameter: Mississippi'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/MS0051756 · MCP: https://passage-data.com/mcp