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National Water Infrastructure LLC - Shadows of Ascension WWTP

Sewerage Systems, Prairieville, Louisiana. NPDES permit LA0124176, in force until Jan 31, 2031. Last 12 months: over a limit 27 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly, form Q quarterly, form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
17 values over a limit, 0 required values missing, 0 of 16 reports late

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

All 27 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], daily maximum22 mg/L≤ 15 mg/L47%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average17 mg/L≤ 10 mg/L70%
October 2025Chlorine, total residual, instantaneous maximum.12 mg/L≤ .033 mg/L264%
October 2025Coliform, fecal general, daily maximum1530 #/100mL≤ 400 #/100mL283%
October 2025Coliform, fecal general, monthly geometric mean664 #/100mL≤ 200 #/100mL232%
October 2025Solids, total suspended, daily maximum122 mg/L≤ 23 mg/L430%
October 2025Solids, total suspended, monthly average61.4 lb/d≤ 21 lb/d192%
October 2025Solids, total suspended, monthly average83 mg/L≤ 15 mg/L453%
November 2025BOD, carbonaceous [5 day, 20 C], daily maximum27 mg/L≤ 15 mg/L80%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average22 mg/L≤ 10 mg/L120%
November 2025Chlorine, total residual, instantaneous maximum3 mg/L≤ .033 mg/L8991%
November 2025Coliform, fecal general, daily maximum410 #/100mL≤ 400 #/100mL3%
November 2025Solids, total suspended, daily maximum254 mg/L≤ 23 mg/L1004%
November 2025Solids, total suspended, monthly average182 mg/L≤ 15 mg/L1113%
November 2025Solids, total suspended, monthly average77.3 lb/d≤ 21 lb/d268%
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum18 mg/L≤ 15 mg/L20%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average14 mg/L≤ 10 mg/L40%
December 2025Solids, total suspended, daily maximum115 mg/L≤ 23 mg/L400%
December 2025Solids, total suspended, monthly average61.1 lb/d≤ 21 lb/d191%
December 2025Solids, total suspended, monthly average90 mg/L≤ 15 mg/L500%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum21 mg/L≤ 15 mg/L40%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average15 mg/L≤ 10 mg/L50%
February 2026Nitrogen, ammonia total [as N], daily maximum28 mg/L≤ 10 mg/L180%
February 2026Nitrogen, ammonia total [as N], monthly average15.24 mg/L≤ 5 mg/L205%
February 2026Nitrogen, ammonia total [as N], monthly average9.7 lb/d≤ 6 lb/d62%
February 2026Solids, total suspended, daily maximum39 mg/L≤ 23 mg/L70%
February 2026Solids, total suspended, monthly average22 mg/L≤ 15 mg/L47%

Limits in force (47)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 23 mg/Lall year
Solids, total suspendeddaily maximum≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 18 lb/dall year
Solids, total suspendedmonthly average≤ 18 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 6 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 6 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]daily maximumreport only (mg/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 12 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 12 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Louisiana'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/LA0124176 · MCP: https://passage-data.com/mcp