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City of Mitchellville

Sewage treatment plant, major discharger, Mitchellville, Iowa. NPDES permit IA0021997, in force until Jul 31, 2028. Last 12 months: over a limit 13 times (last August 2026), 60 required values missing, 6 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (48 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
December 2025Chloride [as Cl], 30-day average410≤ 389 mg/L5%
December 2025Copper, total [as Cu], 30-day average.04174≤ .01687 mg/L147%
December 2025Copper, total [as Cu], daily maximum.108≤ .0269 mg/L301%
December 2025Nitrogen, ammonia total [as N], 30-day average9.204≤ 2.5 mg/L268%
December 2025Nitrogen, ammonia total [as N], daily maximum18.6≤ 16 mg/L16%
December 2025Solids, total suspended, 30-day average31.8≤ 30 mg/L6%
March 2026Copper, total [as Cu], daily maximum.0302≤ .0269 mg/L12%
March 2026Nitrogen, ammonia total [as N], 30-day average3.98125≤ 3.4 mg/L17%
March 2026Solids, total suspended, 7-day average63≤ 45 mg/L40%
April 2026Nitrogen, ammonia total [as N], 30-day average4.159≤ 1.5 mg/L177%
July 2026Nitrogen, ammonia total [as N], 30-day average2.648≤ 1 mg/L165%
August 2026Nitrogen, ammonia total [as N], 30-day average18.67732≤ 13.5 lb/d38%
August 2026Nitrogen, ammonia total [as N], 30-day average3.315≤ 1 mg/L232%

Limits in force (92)

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≤ 423 lb/dall year
Solids, total suspended7-day average≤ 634 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≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 8.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 13.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 9.4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 10.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 7.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 14.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 48 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 24.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 32.7 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 14.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 18.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 34.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 55.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 21.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 13.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 48 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 21.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 109.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 207 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 171 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 172 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 128.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 138.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 208 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 200.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 171 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 107.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 214.1 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 170.5 lb/dOct
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
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 629 mg/Lall year
Chloride [as Cl]30-day average≤ 5478 lb/dall year
Chloride [as Cl]daily maximum≤ 8863 lb/dall year
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .2377 lb/dall year
Copper, total [as Cu]daily maximum≤ .3791 lb/dall year
E. coligeometric mean≤ 126 #/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≤ 352 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 564 lb/dall year

How strict are these limits?

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

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