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City of Carlisle

Sewage treatment plant, major discharger, Carlisle, Iowa. NPDES permit IA0024554, in force until May 31, 2029. Last 12 months: over a limit 6 times (last June 2026), 17 required values missing, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (35 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026pH, daily maximum9.24≤ 9 SU—
March 2026Nitrogen, ammonia total [as N], daily maximum4.19≤ 3.9 mg/L7%
April 2026Nitrogen, ammonia total [as N], daily maximum4.81≤ 4.7 mg/L2%
April 2026Nitrogen, ammonia total [as N], daily maximum59.72274≤ 58.2 lb/d3%
May 2026pH, daily maximum9.04≤ 9 SU—
June 2026pH, daily maximum9.04≤ 9 SU—

Limits in force (79)

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≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 987 lb/dall year
Solids, total suspended7-day average≤ 1481 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≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 48 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 245.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 103.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 39.6 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 32.8 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 39.6 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 32.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 39.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 32.8 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 48 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 32.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 58.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 48 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 245.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 103.9 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 39.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 32.8 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 39.6 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 32.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 39.6 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 32.8 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 48 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 32.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 58.2 lb/dApr
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
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≤ 309 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 494 lb/dall year

How strict are these limits?

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

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