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National Water Infrastructure LLC - Ultima Plaza

Sewerage Systems, Prairieville, Louisiana. NPDES permit LA0126950, in force until Apr 30, 2028. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (30 values), outfall 001 form Q quarterly (15 values), outfall 101 form A quarterly (22 values), outfall 201 form A quarterly (20 values)
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 40 reports late

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

Period endingOutfallParameterReportedLimitOver by
May 2026001Chlorine, total residual, instantaneous maximum2 mg/L≤ .033 mg/L5961%
June 2026001Chlorine, total residual, instantaneous maximum2 mg/L≤ .033 mg/L5961%
June 2026101BOD, carbonaceous [5 day, 20 C], daily maximum13 mg/L≤ 10 mg/L30%
June 2026101BOD, carbonaceous [5 day, 20 C], monthly average8 mg/L≤ 5 mg/L60%

Limits in force (87)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 14.64 lb/dall year001
Solids, total suspendedmonthly average≤ 14.64 lb/dall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.95 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.95 lb/dall year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Chloride [as Cl]daily maximumreport only (mg/L)all year001
Chloride [as Cl]monthly averagereport only (lb/d)all year001
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year001
Sulfate, total [as SO4]monthly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport only (lb/d)all year001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4.88 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4.88 lb/dall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year101
Solids, total suspendedmonthly average≤ 15 mg/Lall year101
Solids, total suspendeddaily maximum≤ 23 mg/Lall year101
Solids, total suspendeddaily maximum≤ 23 mg/Lall year101
Oil & Greasedaily maximum≤ 15 mg/Lall year101
Oil & Greasedaily maximum≤ 15 mg/Lall year101
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year101
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year101
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year101
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Coliform, fecal generalmonthly average≤ 200 CFU/100mLall year101
Coliform, fecal generalmonthly average≤ 200 CFU/100mLall year101
Coliform, fecal generaldaily maximum≤ 400 CFU/100mLall year101
Coliform, fecal generaldaily maximum≤ 400 CFU/100mLall year101
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall year101
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall year101
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10 mg/Lall year101
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10 mg/Lall year101
Solids, total suspendedmonthly average≤ 15 mg/Lall year201
Solids, total suspendedmonthly average≤ 15 mg/Lall year201
Solids, total suspendeddaily maximum≤ 23 mg/Lall year201
Solids, total suspendeddaily maximum≤ 23 mg/Lall year201
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year201
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year201
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year201
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year201
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
Coliform, fecal generalmonthly average≤ 200 CFU/100mLall year201
Coliform, fecal generalmonthly average≤ 200 CFU/100mLall year201
Coliform, fecal generaldaily maximum≤ 400 CFU/100mLall year201
Coliform, fecal generaldaily maximum≤ 400 CFU/100mLall year201
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall year201
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall year201
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10 mg/Lall year201
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10 mg/Lall year201

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/LA0126950 · MCP: https://passage-data.com/mcp