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City of Osceola

Sewage treatment plant, major discharger, Osceola, Iowa. NPDES permit IA0041815, in force until Oct 31, 2029. Last 12 months: over a limit 31 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (56 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
33 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 31 values over a limit
Period endingParameterReportedLimitOver by
October 2025Copper, total [as Cu], 30-day average.042733≤ .01687 mg/L153%
October 2025Copper, total [as Cu], daily maximum.0727≤ .0269 mg/L170%
October 2025Cyanide, total [as CN], 30-day average.00525≤ .0052 mg/L1%
November 2025Chloride [as Cl], 30-day average442≤ 389 mg/L14%
November 2025Copper, total [as Cu], 30-day average.044666≤ .01687 mg/L165%
November 2025Copper, total [as Cu], daily maximum.0595≤ .0269 mg/L121%
November 2025Solids, total suspended, 7-day average45.33333≤ 45 mg/L1%
December 2025Chloride [as Cl], 30-day average580.5≤ 389 mg/L49%
December 2025Chloride [as Cl], daily maximum636≤ 629 mg/L1%
December 2025Copper, total [as Cu], 30-day average.0546≤ .01687 mg/L224%
December 2025Copper, total [as Cu], daily maximum.0756≤ .0269 mg/L181%
January 2026Chloride [as Cl], 30-day average495.6≤ 389 mg/L27%
January 2026Chloride [as Cl], daily maximum662≤ 629 mg/L5%
January 2026Copper, total [as Cu], 30-day average.065969≤ .01687 mg/L291%
January 2026Copper, total [as Cu], daily maximum.133≤ .0269 mg/L394%
February 2026Chloride [as Cl], 30-day average460≤ 389 mg/L18%
February 2026Copper, total [as Cu], 30-day average.069175≤ .01687 mg/L310%
February 2026Copper, total [as Cu], daily maximum.104≤ .0269 mg/L287%
March 2026Chloride [as Cl], 30-day average474.25≤ 389 mg/L22%
March 2026Copper, total [as Cu], 30-day average.0491≤ .01687 mg/L191%
March 2026Copper, total [as Cu], daily maximum.0644≤ .0269 mg/L139%
April 2026Copper, total [as Cu], 30-day average.034614≤ .01687 mg/L105%
April 2026Copper, total [as Cu], daily maximum.042≤ .0269 mg/L56%
May 2026Copper, total [as Cu], 30-day average.029623≤ .01687 mg/L76%
May 2026Copper, total [as Cu], daily maximum.0399≤ .0269 mg/L48%
June 2026Copper, total [as Cu], 30-day average.029623≤ .01687 mg/L76%
June 2026Copper, total [as Cu], daily maximum.0399≤ .0269 mg/L48%
July 2026Copper, total [as Cu], 30-day average.028861≤ .01687 mg/L71%
July 2026Copper, total [as Cu], daily maximum.0479≤ .0269 mg/L78%
August 2026Copper, total [as Cu], 30-day average.029538≤ .01687 mg/L75%
August 2026Copper, total [as Cu], daily maximum.0393≤ .0269 mg/L46%

Limits in force (100)

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≤ 957 lb/dall year
Solids, total suspended7-day average≤ 1436 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, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 14.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 11.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 10.6 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 13.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 48.6 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 126.1 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 41.8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 78.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 32.1 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 74 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 108.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 55.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 30.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 49.6 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 33.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 108.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 500.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 452.9 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 460.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 509.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 344.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 468.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 484.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 484.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 328.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 500.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 417.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 468.5 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
Cyanide, total [as CN]30-day average≤ .0052 mg/Lall year
Cyanide, total [as CN]daily maximum≤ .022 mg/Lall year
Cyanide, total [as CN]30-day average≤ .1659 lb/dall year
Cyanide, total [as CN]daily maximum≤ .7018 lb/dall year
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 629 mg/Lall year
Chloride [as Cl]30-day average≤ 12398 lb/dall year
Chloride [as Cl]daily maximum≤ 20061 lb/dall year
Chromium, hexavalent [as Cr]30-day average≤ .01143 mg/Lall year
Chromium, hexavalent [as Cr]daily maximum≤ .01629 mg/Lall year
Chromium, hexavalent [as Cr]30-day average≤ .3648 lb/dall year
Chromium, hexavalent [as Cr]daily maximum≤ .5198 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≤ .5381 lb/dall year
Copper, total [as Cu]daily maximum≤ .8581 lb/dall year
E. coligeometric mean≤ 630 #/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≤ 798 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1276 lb/dall year

How strict are these limits?

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

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