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Hattiesburg South Lagoon

Sewage treatment plant, major discharger, Hattiesburg, Mississippi. NPDES permit MS0020303, in force until Oct 31, 2030. Last 12 months: over a limit 14 times (last August 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (55 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
17 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 14 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, maximum weekly average≥ 2420 #/100mL≤ 410 #/100mL490%
October 2025Solids, suspended percent removal, minimum59.8 %≥ 65 %15%
November 2025Solids, suspended percent removal, minimum49.7 %≥ 65 %44%
December 2025E. coli, maximum weekly average517 #/100mL≤ 410 #/100mL26%
December 2025Solids, suspended percent removal, minimum63.5 %≥ 65 %4%
January 2026Solids, suspended percent removal, minimum47.3 %≥ 65 %51%
February 2026Solids, suspended percent removal, minimum44 %≥ 65 %60%
April 2026Nitrogen, ammonia total [as N], monthly average2.8 mg/L≤ 2 mg/L40%
April 2026Nitrogen, ammonia total [as N], maximum weekly average4 mg/L≤ 3 mg/L33%
July 2026Solids, suspended percent removal, minimum52 %≥ 65 %37%
August 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average41 mg/L≤ 37.5 mg/L9%
August 2026Nitrogen, ammonia total [as N], monthly average2.1 mg/L≤ 2 mg/L5%
August 2026Nitrogen, ammonia total [as N], maximum weekly average3.9 mg/L≤ 3 mg/L30%
August 2026Solids, suspended percent removal, minimum60.8 %≥ 65 %12%

Limits in force (55)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 75 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 95 mg/Lall year
Solids, total suspendedmonthly average≤ 12510 lb/dall year
Solids, total suspendedmaximum weekly average≤ 15846 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmaximum weekly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]maximum weekly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]maximum weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 334 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 501 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (lb/d)all year
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrogen, nitrate total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly average≤ 20 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .134 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .23 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 37.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4170 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 6255 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]minimum≥ 65 %all year
Solids, suspended percent removalminimum≥ 65 %all year

How strict are these limits?

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/MS0020303 · MCP: https://passage-data.com/mcp