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Town of Wilsonville

Sewage treatment plant, Wilsonville, Alabama. NPDES permit AL0021491, in force until Mar 31, 2029. Last 12 months: over a limit 8 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 1 monthly (43 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
July 2026Nitrogen, ammonia total [as N], monthly average4.7≤ 1 mg/L370%
July 2026Nitrogen, ammonia total [as N], weekly average12.8≤ 1.5 mg/L753%
August 2026BOD, carbonaceous [5 day, 20 C], weekly average16.9≤ 12 mg/L41%
August 2026E. coli, daily maximum900≤ 298 #/100mL202%
August 2026E. coli, monthly average180≤ 126 #/100mL43%
August 2026Nitrogen, ammonia total [as N], monthly average7.74≤ 1 mg/L674%
August 2026Nitrogen, ammonia total [as N], weekly average.54≤ .5 lb/d8%
August 2026Nitrogen, ammonia total [as N], weekly average23.3≤ 1.5 mg/L1453%

Limits in force (57)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 10 lb/dall year
Solids, total suspendedweekly average≤ 15 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedweekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]weekly average≤ 1.5 mg/LMay–Nov
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ .33 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ .66 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]weekly average≤ .5 lb/dMay–Nov
Nitrogen, ammonia total [as N]weekly average≤ 1 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Apr–Oct
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (mg/L)Apr–Oct
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (lb/d)Apr–Oct
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (lb/d)Apr–Oct
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Apr–Oct
Nitrite + Nitrate total [as N]weekly averagereport only (mg/L)Apr–Oct
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)Apr–Oct
Nitrite + Nitrate total [as N]weekly averagereport only (lb/d)Apr–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)Apr–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]weekly averagereport only (mg/L)Apr–Oct
Phosphorus, total [as P]weekly averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]monthly average≤ .08 lb/dApr–Oct
Phosphorus, total [as P]monthly averagereport only (lb/d)Jan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]weekly average≤ .12 lb/dApr–Oct
Phosphorus, total [as P]weekly averagereport only (lb/d)Jan, Feb, Mar, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
E. colimonthly average≤ 548 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colimonthly average≤ 126 #/100mLMay–Oct
E. colidaily maximum≤ 2507 #/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colidaily maximum≤ 298 #/100mLMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 13 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 12 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]weekly average≤ 19.5 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.7 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4.3 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 4 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]weekly average≤ 6.5 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]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]weekly averagereport only (lb/d)all year
BOD, carb-5 day, 20 deg C, 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: Alabama'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/AL0021491 · MCP: https://passage-data.com/mcp