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City of Maxwell

Sewage treatment plant, Maxwell, Iowa. NPDES permit IA0041793, in force until May 31, 2031. Last 12 months: over a limit 3 times (last August 2026), 4 required values missing. 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, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
August 2026Solids, total suspended, 30-day average57≤ 30 mg/L90%
August 2026Solids, total suspended, 7-day average109≤ 45 mg/L142%
August 2026Solids, total suspended, 7-day average210.9019≤ 169 lb/d25%

Limits in force (72)

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≤ 112 lb/dall year
Solids, total suspended7-day average≤ 169 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
Oil & Grease30-day average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 12.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 11.2 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.6 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 14.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 13.4 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 13.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 6.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 7.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 6.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 14.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 14.1 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 4.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 4.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 16.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 5.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 9.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 10.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 64.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 45.7 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 41.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 59.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 69.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 54.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 64.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 49.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 59.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 49.9 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 54.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 64.1 lb/dDec
E. coligeometric mean≤ 162 #/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≤ 94 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 150 lb/dall year

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/IA0041793 · MCP: https://passage-data.com/mcp