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City of Desoto

Sewage treatment plant, De Soto, Iowa. NPDES permit IA0056821, in force until Dec 31, 2030. Last 12 months: over a limit 3 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (28 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025Nitrogen, ammonia total [as N], 30-day average3.19≤ 2.5 mg/L28%
December 2025Nitrogen, ammonia total [as N], daily maximum7.36≤ 3.9 mg/L89%
January 2026Nitrogen, ammonia total [as N], 30-day average10.6075≤ 3.4 mg/L212%

Limits in force (72)

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≤ 158 lb/dall year
Solids, total suspended7-day average≤ 236 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, 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≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 12.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 17.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 13 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 6.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 9.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 5.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 17.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 20.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 8.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 13.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 104.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 13.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 13.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 24.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 44.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 13.9 lb/dOct
Nitrogen, Kjeldahl, total [as N]30-day average≤ 52 lb/dall year
Nitrogen, Kjeldahl, total [as N]daily maximum≤ 85 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
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≤ 131 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 210 lb/dall year

New limits from Dec 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], 30-day average2042 lb/dnew——
Chloride [as Cl], 30-day average389 mg/Lnew——
Chloride [as Cl], daily maximum629 mg/Lnew——
Chloride [as Cl], daily maximum3304 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/IA0056821 · MCP: https://passage-data.com/mcp