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Iowa Great Lakes Sanitary District

Sewage treatment plant, major discharger, Milford, Iowa. NPDES permit IA0059765 expired Aug 31, 2026; its limits still apply. Last 12 months: over a limit 8 times (last March 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (64 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
November 2025Copper, total [as Cu], 30-day average.017125≤ .01687 mg/L2%
December 2025Copper, total [as Cu], 30-day average.0294≤ .01687 mg/L74%
December 2025Copper, total [as Cu], daily maximum.0765≤ .0269 mg/L184%
December 2025Copper, total [as Cu], daily maximum1.255603≤ 1.16 lb/d8%
January 2026Copper, total [as Cu], 30-day average.0206≤ .01687 mg/L22%
January 2026Copper, total [as Cu], daily maximum.0309≤ .0269 mg/L15%
February 2026Cadmium, total [as Cd], 30-day average.00052≤ .000456 mg/L14%
March 2026pH, daily minimum6.39≥ 6.5 SU—

Limits in force (108)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
pH30-day averagereport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 1294 lb/dall year
Solids, total suspended7-day average≤ 1940 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspended30-day averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.57 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 8.57 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 8.57 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 5.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 7.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 11.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 170.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 45.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 75 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 100 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 65.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 67.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 41.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 43.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 106.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 56.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 146.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 146.8 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 612 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 168 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 359 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 359 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 359 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 285 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 108 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 116 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 421 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 207 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 553 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 493 lb/dMar
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Cadmium, total [as Cd]30-day average≤ .000456 mg/Lall year
Cadmium, total [as Cd]daily maximum≤ .00432 mg/Lall year
Cadmium, total [as Cd]30-day average≤ .0196 lb/dall year
Cadmium, total [as Cd]daily maximum≤ .186 lb/dall year
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .7273 lb/dall year
Copper, total [as Cu]daily maximum≤ 1.16 lb/dall year
Selenium, total [as Se]30-day average≤ .005 mg/Lall year
Selenium, total [as Se]daily maximum≤ .0193 mg/Lall year
Selenium, total [as Se]30-day average≤ .2156 lb/dall year
Selenium, total [as Se]daily maximum≤ .8322 lb/dall year
Phenols30-day average≤ .05 mg/Lall year
Phenolsdaily maximum≤ 2.5 mg/Lall year
Phenols30-day average≤ 2.156 lb/dall year
Phenolsdaily maximum≤ 107.8 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 1078 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1725 lb/dall year

How strict are these limits?

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

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