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City of Dyersville

Sewage treatment plant, major discharger, Dyersville, Iowa. NPDES permit IA0023345, in force until Jan 31, 2031. Last 12 months: over a limit 12 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 4 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], daily maximum19.7≤ 16.2 mg/L22%
February 2026Oxygen, dissolved [DO], daily minimum.78≥ 2.7 mg/L71%
March 2026Nitrogen, ammonia total [as N], 30-day average22.14444≤ 7.7 mg/L188%
March 2026Nitrogen, ammonia total [as N], 30-day average65.13966≤ 47.3 lb/d38%
March 2026Nitrogen, ammonia total [as N], daily maximum33.8≤ 16.4 mg/L106%
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average86≤ 25 mg/L244%
April 2026Nitrogen, ammonia total [as N], 30-day average12.25666≤ 5.8 mg/L111%
April 2026Nitrogen, ammonia total [as N], 30-day average47.87519≤ 35.1 lb/d36%
April 2026Nitrogen, ammonia total [as N], daily maximum18.3≤ 17.2 mg/L6%
April 2026Oxygen, dissolved [DO], daily minimum.17≥ 2.7 mg/L94%
May 2026BOD, carbonaceous [5 day, 20 C], 7-day average57.5≤ 40 mg/L44%
May 2026Oxygen, dissolved [DO], daily minimum2.25≥ 2.7 mg/L17%

Limits in force (62)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 2.7 mg/Lall year
pHdaily minimum≥ 6.4 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≤ 295 lb/dall year
Solids, total suspended7-day average≤ 442 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 6.6 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 5.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 13 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 9.4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 5.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 7.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 14.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 8.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 17.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 17.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 17.2 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 19.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 16.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 18 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16.1 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 40.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 22 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 36 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 79.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 57.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 35.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 23.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 47.3 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 91 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 30.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 24.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 53.8 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 157 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 167.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 161.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 157.9 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 164.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 161.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 181.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 152.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 149 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 149.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 169.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 151.1 lb/dNov
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≤ 246 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 393 lb/dall year

How strict are these limits?

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

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