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Jackson County Utility Authority, Potw 1C

Sewage treatment plant, major discharger, Ocean Springs, Mississippi. NPDES permit MS0045446, in force until Dec 31, 2029. Last 12 months: over a limit 4 times (last June 2026), 3 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (37 values), form Q quarterly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 5 required values missing, 2 of 16 reports late

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

Period endingParameterReportedLimitOver by
May 2026BOD, carbonaceous [5 day, 20 C], monthly average12 mg/L≤ 10 mg/L20%
June 2026%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum0 %≥ 100 %100%
June 2026%Effect Static Renewal 7Day Chronic Pimephales promelas, minimum0 %≥ 100 %100%
June 2026Flow, in conduit or thru treatment plant, monthly average7.7 MGD≤ 7 MGD10%

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≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 1751 lb/dall year
Solids, total suspendedmaximum weekly average≤ 2627 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]quarterly averagereport only (mg/L)all year
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year
Nitrogen, total [as N]quarterly averagereport only (lb/d)all year
Nitrogen, total [as N]quarterly maximumreport only (lb/d)all year
Nitrogen, total [as N]quarterly averagereport only (mg/L)all year
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year
Nitrogen, total [as N]quarterly averagereport only (lb/d)all year
Nitrogen, total [as N]quarterly maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 5.25 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 7.88 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 306 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 460 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
Phosphorus, total [as P]quarterly averagereport only (mg/L)all year
Phosphorus, total [as P]quarterly maximumreport only (mg/L)all year
Phosphorus, total [as P]quarterly averagereport only (lb/d)all year
Phosphorus, total [as P]quarterly maximumreport only (lb/d)all year
Phosphorus, total [as P]quarterly averagereport only (mg/L)all year
Phosphorus, total [as P]quarterly maximumreport only (mg/L)all year
Phosphorus, total [as P]quarterly averagereport only (lb/d)all year
Phosphorus, total [as P]quarterly maximumreport only (lb/d)all year
Copper, total recoverablemonthly average≤ .009 mg/Lall year
Copper, total recoverablemaximum weekly average≤ .012 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ 7 MGDall year
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualmaximum weekly average≤ .019 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 584 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 876 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, percent removalminimum≥ 85 % effectall year
Solids, suspended percent removalminimum≥ 85 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 100 %all year
%Effect Static Renewal 7Day Chronic Pimephales promelasminimum≥ 100 %all year

New limits from Dec 30, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average80.1 lb/dtighter97.49 lb/d (11 values)1.22×
Nitrogen, ammonia total [as N], monthly average1.39 mg/Ltighter3.33 mg/L (11 values)2.4×
Nitrogen, ammonia total [as N], maximum weekly average2.1 mg/Ltighter3.33 mg/L (11 values)1.59×
Nitrogen, ammonia total [as N], maximum weekly average120.8 lb/dtighter97.49 lb/d (11 values)0.807×

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

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