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City of Mount Pleasant

Sewage treatment plant, major discharger, Mount Pleasant, Iowa. NPDES permit IA0047970, in force until Jun 30, 2029. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (39 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (83)

ParameterStatisticLimitMonths
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 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≤ 1001 lb/dall year
Solids, total suspended7-day average≤ 1501 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 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≤ 17.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 8.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 12.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 12 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 18.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 13.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 18.6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 8.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 19.3 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 19.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 7.7 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 10.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 22.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 19.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 19.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 18.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 19 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 18.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 20.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 19.3 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 19.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.2 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 598 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 269 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 415 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 401 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 621 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 461 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 621 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 282 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 645 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 641 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 256 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 350 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 598 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 736 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 642 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 637 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 621 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 633 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 621 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 677 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 645 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 641 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 682 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 608 lb/dJun
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
E. coligeometric mean≤ 130 #/100mLMar–Nov
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≤ 834 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1334 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/IA0047970 · MCP: https://passage-data.com/mcp