Passage Data · Check a report · Use it from your AI

City of Plymouth

Sewage treatment plant, Plymouth, Iowa. NPDES permit IA0033383, in force until Apr 30, 2030. Last 12 months: no values over a limit, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (21 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 6 required values missing, 0 of 12 reports late

Limits in force (65)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 158 lb/dall year
Solids, total suspended7-day average≤ 237 lb/dall year
Nitrogen, total [as N]30-day average≤ 22.9 lb/dall year
Nitrogen, total [as N]daily maximum≤ 37.5 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 31.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 38.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 23.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 28.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 27.7 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 26.3 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 31.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 26.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 62.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 58.6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 25.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 32.3 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 31.2 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 38.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 23.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 28.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 27.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 26.3 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 31.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 26.3 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 62.4 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 58.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 25.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 32.3 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 22.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 29 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 17.6 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 21.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 23.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 20.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 22.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 20.1 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 65.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 47.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 19.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 22.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 29 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 21.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 23.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 22.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 65.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 47.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 19.4 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dDec
Chlorine, total residual30-day average≤ .158 mg/Lall year
Chlorine, total residualdaily maximum≤ .158 mg/Lall year
Chlorine, total residual30-day average≤ .121 lb/dall year
Chlorine, total residualdaily maximum≤ .121 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≤ 49 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 79 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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0033383 · MCP: https://passage-data.com/mcp