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City of Osage

Sewage treatment plant, major discharger, Osage, Iowa. NPDES permit IA0032956, in force until Jan 31, 2030. Last 12 months: over a limit 25 times (last July 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (46 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
16 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], 30-day average11.86621≤ 2.8 mg/L324%
November 2025Nitrogen, ammonia total [as N], 30-day average39.65919≤ 24.4 lb/d63%
November 2025Nitrogen, ammonia total [as N], daily maximum21≤ 14.7 mg/L43%
December 2025E. coli, geometric mean419.7289≤ 126 #/100mL233%
December 2025Nitrogen, ammonia total [as N], 30-day average14.17831≤ 3 mg/L373%
December 2025Nitrogen, ammonia total [as N], 30-day average46.46817≤ 26 lb/d79%
December 2025Nitrogen, ammonia total [as N], daily maximum24≤ 16 mg/L50%
January 2026Nitrogen, ammonia total [as N], 30-day average13.94677≤ 4.1 mg/L240%
January 2026Nitrogen, ammonia total [as N], 30-day average46.90969≤ 35.8 lb/d31%
January 2026Nitrogen, ammonia total [as N], daily maximum30≤ 15.3 mg/L96%
February 2026Copper, total [as Cu], daily maximum.034≤ .027 mg/L26%
February 2026Solids, total suspended, 7-day average46≤ 45 mg/L2%
March 2026Nitrogen, ammonia total [as N], 30-day average22.9289≤ 21.9 lb/d5%
March 2026Nitrogen, ammonia total [as N], 30-day average6.509511≤ 2.5 mg/L160%
March 2026Nitrogen, ammonia total [as N], daily maximum34≤ 14.7 mg/L131%
March 2026Solids, total suspended, 30-day average65≤ 30 mg/L117%
March 2026Solids, total suspended, 7-day average175≤ 45 mg/L289%
March 2026Solids, total suspended, 7-day average646.5585≤ 402 lb/d61%
April 2026Nitrogen, ammonia total [as N], 30-day average2.270011≤ 1.8 mg/L26%
May 2026Copper, total [as Cu], 30-day average.02175≤ .01757 mg/L24%
May 2026Copper, total [as Cu], daily maximum.031≤ .027 mg/L15%
June 2026Copper, total [as Cu], 30-day average.025≤ .01757 mg/L42%
June 2026Copper, total [as Cu], daily maximum.036≤ .027 mg/L33%
July 2026Nitrogen, ammonia total [as N], 30-day average15.57289≤ 10.5 lb/d48%
July 2026Nitrogen, ammonia total [as N], 30-day average2.903166≤ 1.2 mg/L142%

Limits in force (90)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.9 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≤ 268 lb/dall year
Solids, total suspended7-day average≤ 402 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 average≤ 239.2 lb/dall year
Nitrogen, total [as N]daily maximum≤ 391.5 lb/dall 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≤ 3 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 16.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.6 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 14.3 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 26 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 16.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 13.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 10 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 18.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 21.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 10.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 16 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 24.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 11.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 35.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 41.4 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 143 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 140.7 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 129.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 145.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 136.1 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 131.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 157.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 140.7 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 131.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 147.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 136.2 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 127.4 lb/dFeb
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
Copper, total [as Cu]30-day average≤ .01757 mg/Lall year
Copper, total [as Cu]daily maximum≤ .027 mg/Lall year
Copper, total [as Cu]30-day average≤ .1563 lb/dall year
Copper, total [as Cu]daily maximum≤ .2411 lb/dall year
E. coligeometric mean≤ 126 #/100mLall year
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≤ 223 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 357 lb/dall year

New limits from Jan 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], 30-day average403 mg/Lnew——
Chloride [as Cl], 30-day average3591 lb/dnew——
Chloride [as Cl], daily maximum631 mg/Lnew——
Chloride [as Cl], daily maximum5635 lb/dnew——

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0032956 · MCP: https://passage-data.com/mcp