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City of Rockwell City

Sewage treatment plant, major discharger, Rockwell City, Iowa. NPDES permit IA0033138, in force until Dec 31, 2027. Last 12 months: over a limit 25 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (58 values)
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 2 of 12 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
January 2026Chloride [as Cl], 30-day average587≤ 405 mg/L45%
January 2026Solids, total suspended, 7-day average50≤ 45 mg/L11%
February 2026Chloride [as Cl], 30-day average582≤ 405 mg/L44%
February 2026Solids, total suspended, 30-day average39.075≤ 30 mg/L30%
February 2026Solids, total suspended, 7-day average107≤ 45 mg/L138%
March 2026Chloride [as Cl], 30-day average877≤ 405 mg/L117%
March 2026Chloride [as Cl], daily maximum877≤ 632 mg/L39%
March 2026Copper, total [as Cu], 30-day average.052≤ .01765 mg/L195%
March 2026Copper, total [as Cu], daily maximum.052≤ .02702 mg/L92%
April 2026Chloride [as Cl], 30-day average657≤ 405 mg/L62%
April 2026Chloride [as Cl], daily maximum657≤ 632 mg/L4%
April 2026E. coli, geometric mean288.2902≤ 126 #/100mL129%
May 2026Chloride [as Cl], 30-day average712≤ 405 mg/L76%
May 2026Chloride [as Cl], daily maximum712≤ 632 mg/L13%
June 2026Chloride [as Cl], 30-day average842≤ 405 mg/L108%
June 2026Chloride [as Cl], daily maximum842≤ 632 mg/L33%
July 2026Chloride [as Cl], 30-day average1062≤ 405 mg/L162%
July 2026Chloride [as Cl], daily maximum1062≤ 632 mg/L68%
August 2026Chloride [as Cl], 30-day average1047≤ 405 mg/L159%
August 2026Chloride [as Cl], daily maximum1047≤ 632 mg/L66%
August 2026Copper, total [as Cu], 30-day average.055≤ .01765 mg/L212%
August 2026Copper, total [as Cu], daily maximum.055≤ .02702 mg/L104%
August 2026Solids, total suspended, 7-day average76≤ 45 mg/L69%
September 2026Chloride [as Cl], 30-day average827≤ 405 mg/L104%
September 2026Chloride [as Cl], daily maximum827≤ 632 mg/L31%

Limits in force (102)

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≤ 279 lb/dall year
Solids, total suspended7-day average≤ 418 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, 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≤ 3.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 6.6 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 9.6 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 17.7 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 11.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 8.3 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 11.5 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 24.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 17.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 10.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 33.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 9.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 34 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 10 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 15.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 23.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 39.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 13.1 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 15.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 48.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 87.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 92.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 72.5 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 70.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 71.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 75.3 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 69.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 56.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 86 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 102.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 58.3 lb/dApr
Nitrogen, Kjeldahl, total [as N]30-day average≤ 116 lb/dall year
Nitrogen, Kjeldahl, total [as N]daily maximum≤ 190 lb/dall year
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
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≤ 405 mg/Lall year
Chloride [as Cl]daily maximum≤ 632 mg/Lall year
Chloride [as Cl]30-day average≤ 3659 lb/dall year
Chloride [as Cl]daily maximum≤ 5851 lb/dall year
Copper, total [as Cu]30-day average≤ .01765 mg/Lall year
Copper, total [as Cu]daily maximum≤ .02702 mg/Lall year
Copper, total [as Cu]30-day average≤ .159 lb/dall year
Copper, total [as Cu]daily maximum≤ .2503 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≤ 232 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 372 lb/dall year

How strict are these limits?

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

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