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City of Madrid

Sewage treatment plant, Madrid, Iowa. NPDES permit IA0028207, in force until Aug 31, 2031. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (32 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
11 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026Solids, total suspended, 7-day average128≤ 45 mg/L184%
June 2026Solids, total suspended, 7-day average388.5772≤ 372 lb/d4%

Limits in force (76)

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≤ 248 lb/dall year
Solids, total suspended7-day average≤ 372 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≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 14.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 17.6 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 29.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 9.3 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 21.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 13.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 15.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 11.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 29.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 34.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 20.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 8.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 8.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 13.7 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 121.5 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 136.4 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 132 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 129.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 125.6 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 119.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 125.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 117.5 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 121.4 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 134.2 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 145.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 129.8 lb/dOct
Nitrogen, nitrate total [as N]30-day average≤ 184 lb/dall year
Nitrogen, nitrate total [as N]daily maximum≤ 302 lb/dall year
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
E. coligeometric mean≤ 163 #/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≤ 206 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 330 lb/dall year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0028207 · MCP: https://passage-data.com/mcp