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Millstadt, Village of

Sewage treatment plant, Millstadt, Illinois. NPDES permit IL0032514, in force until Aug 31, 2030. Last 12 months: over a limit 64 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (24 values), outfall INF form L monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 64 values over a limit
Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], daily maximum11.7 mg/L≤ 4.4 mg/L166%
January 2026Nitrogen, ammonia total [as N], monthly average4.846 mg/L≤ 3.2 mg/L51%
January 2026Phosphorus, total [as P], monthly average2.608 mg/L≤ 1 mg/L161%
January 2026Solids, total suspended, daily maximum33 mg/L≤ 24 mg/L38%
January 2026Solids, total suspended, monthly average15.5 mg/L≤ 12 mg/L29%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum21.3 mg/L≤ 20 mg/L7%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average17.78 mg/L≤ 10 mg/L78%
February 2026Nitrogen, ammonia total [as N], daily maximum21.2 mg/L≤ 4.4 mg/L382%
February 2026Nitrogen, ammonia total [as N], daily maximum70.723 lb/d≤ 67 lb/d6%
February 2026Nitrogen, ammonia total [as N], monthly average15.88 mg/L≤ 3.2 mg/L396%
February 2026Phosphorus, total [as P], monthly average5.01 mg/L≤ 1 mg/L401%
February 2026Solids, total suspended, daily maximum33 mg/L≤ 24 mg/L38%
February 2026Solids, total suspended, monthly average18.75 mg/L≤ 12 mg/L56%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum28.8 mg/L≤ 20 mg/L44%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average23.28 mg/L≤ 10 mg/L133%
March 2026Nitrogen, ammonia total [as N], daily maximum18.3 mg/L≤ 3 mg/L510%
March 2026Nitrogen, ammonia total [as N], daily maximum55.402 lb/d≤ 46 lb/d20%
March 2026Nitrogen, ammonia total [as N], monthly average11.83 mg/L≤ 1.5 mg/L689%
March 2026Nitrogen, ammonia total [as N], monthly average29.697 lb/d≤ 23 lb/d29%
March 2026Phosphorus, total [as P], monthly average4.12 mg/L≤ 1 mg/L312%
March 2026Solids, total suspended, daily maximum44 mg/L≤ 24 mg/L83%
March 2026Solids, total suspended, monthly average19.67 mg/L≤ 12 mg/L64%
April 2026BOD, carbonaceous [5 day, 20 C], daily maximum46.8 mg/L≤ 20 mg/L134%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average33.45 mg/L≤ 10 mg/L235%
April 2026Nitrogen, ammonia total [as N], daily maximum51.052 lb/d≤ 46 lb/d11%
April 2026Nitrogen, ammonia total [as N], daily maximum9.52 mg/L≤ 3 mg/L217%
April 2026Nitrogen, ammonia total [as N], monthly average5.44 mg/L≤ 1.5 mg/L263%
April 2026Phosphorus, total [as P], monthly average3.28 mg/L≤ 1 mg/L228%
April 2026Solids, total suspended, daily maximum32 mg/L≤ 24 mg/L33%
April 2026Solids, total suspended, monthly average20.75 mg/L≤ 12 mg/L73%
May 2026BOD, carbonaceous [5 day, 20 C], daily maximum35.4 mg/L≤ 20 mg/L77%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average25.3 mg/L≤ 10 mg/L153%
May 2026Coliform, fecal general, daily maximum500 #/100mL≤ 400 #/100mL25%
May 2026Nitrogen, ammonia total [as N], daily maximum3.09 mg/L≤ 3 mg/L3%
May 2026Nitrogen, ammonia total [as N], monthly average1.52 mg/L≤ 1.5 mg/L1%
May 2026Phosphorus, total [as P], monthly average2.31 mg/L≤ 1 mg/L131%
May 2026Solids, total suspended, daily maximum402.322 lb/d≤ 368 lb/d9%
May 2026Solids, total suspended, daily maximum72 mg/L≤ 24 mg/L200%
May 2026Solids, total suspended, monthly average26.83 mg/L≤ 12 mg/L124%
June 2026BOD, carbonaceous [5 day, 20 C], daily maximum23.4 mg/L≤ 20 mg/L17%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average21.35 mg/L≤ 10 mg/L114%
June 2026Coliform, fecal general, daily maximum500 #/100mL≤ 400 #/100mL25%
June 2026Nitrogen, ammonia total [as N], monthly average2.67 mg/L≤ 1.5 mg/L78%
June 2026Phosphorus, total [as P], monthly average2.9 mg/L≤ 1 mg/L190%
June 2026Solids, total suspended, daily maximum44 mg/L≤ 24 mg/L83%
June 2026Solids, total suspended, monthly average26.5 mg/L≤ 12 mg/L121%
July 2026BOD, carbonaceous [5 day, 20 C], daily maximum22.8 mg/L≤ 20 mg/L14%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average20.6 mg/L≤ 10 mg/L106%
July 2026Nitrogen, ammonia total [as N], monthly average2.26 mg/L≤ 1.5 mg/L51%
July 2026Phosphorus, total [as P], monthly average3.51 mg/L≤ 1 mg/L251%
July 2026Solids, total suspended, daily maximum36 mg/L≤ 24 mg/L50%
July 2026Solids, total suspended, monthly average25.26 mg/L≤ 12 mg/L111%
August 2026BOD, carbonaceous [5 day, 20 C], daily maximum21.9 mg/L≤ 20 mg/L10%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average17.59 mg/L≤ 10 mg/L76%
August 2026Phosphorus, total [as P], monthly average3.18 mg/L≤ 1 mg/L218%
August 2026Solids, total suspended, daily maximum28 mg/L≤ 24 mg/L17%
August 2026Solids, total suspended, monthly average15.29 mg/L≤ 12 mg/L27%
September 2026BOD, carbonaceous [5 day, 20 C], daily maximum31.8 mg/L≤ 20 mg/L59%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average22.8 mg/L≤ 10 mg/L128%
September 2026Nitrogen, ammonia total [as N], daily maximum4.61 mg/L≤ 3 mg/L54%
September 2026Nitrogen, ammonia total [as N], monthly average4.15 mg/L≤ 1.5 mg/L177%
September 2026Phosphorus, total [as P], monthly average3.74 mg/L≤ 1 mg/L274%
September 2026Solids, total suspended, daily maximum26 mg/L≤ 24 mg/L8%
September 2026Solids, total suspended, monthly average17.25 mg/L≤ 12 mg/L44%

Limits in force (41)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 12 mg/Lall year001
Solids, total suspendeddaily maximum≤ 24 mg/Lall year001
Solids, total suspendedmonthly average≤ 184 lb/dall year001
Solids, total suspendeddaily maximum≤ 368 lb/dall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 3.2 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 23 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 23 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 49 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 46 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 123 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 67 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 58 lb/dJun–Aug001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 15 lb/dall 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
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .05 mg/LMay–Oct001
Coliform, fecal generaldaily maximum≤ 400 #/100mLMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 153 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 307 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

How strict are these limits?

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

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