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City of Zwingle

Sewage treatment plant, Zwingle, Iowa. NPDES permit IA0074209, in force until Sep 30, 2029. Last 12 months: over a limit 5 times (last July 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (27 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 8 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], 30-day average11.6≤ 9.2 mg/L26%
March 2026Nitrogen, ammonia total [as N], daily maximum19.9≤ 17.9 mg/L11%
May 2026BOD, carbonaceous [5 day, 20 C], 30-day average28≤ 25 mg/L12%
July 2026Nitrogen, ammonia total [as N], 30-day average.604207≤ .5 lb/d21%
July 2026Nitrogen, ammonia total [as N], 30-day average7.79≤ 5.9 mg/L32%

Limits in force (71)

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
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 4.3 lb/dall year
Solids, total suspended7-day average≤ 6.5 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≤ 17.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 6.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 5.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 17.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 7.8 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 18.5 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 10.3 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 9.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 5.9 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 13.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 14.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 19.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 19.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.3 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 18.5 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 18.1 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 20.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 17.3 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 1.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ .6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ .7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ .9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ .8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 1.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 2.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 2.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 2.5 lb/dDec
Chlorine, total residual30-day average≤ .027 mg/Lall year
Chlorine, total residualdaily maximum≤ .027 mg/Lall year
Chlorine, total residual30-day average≤ .0033 lb/dall year
Chlorine, total residualdaily maximum≤ .0033 lb/dall year
E. coligeometric mean≤ 630 #/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≤ 3.6 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 5.8 lb/dall year

How strict are these limits?

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

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