Passage Data · Check a report · Use it from your AI

City of Storm Lake

Sewage treatment plant, major discharger, Storm Lake, Iowa. NPDES permit IA0032484, in force until Oct 31, 2029. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (42 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 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
July 2026Nitrogen, ammonia total [as N], 30-day average2.192285≤ 1 mg/L119%

Limits in force (86)

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≤ 1614 lb/dall year
Solids, total suspended7-day average≤ 2421 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≤ 2.4 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LOct
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≤ 16.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 17.4 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 126 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 185 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 51.8 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 185 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 94.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 134.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 84.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 214.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 82.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 57.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 54.6 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 71.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 790.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 790.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 828.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 817.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 817.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 858.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 844.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 764 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 844.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 887.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 866.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 777 lb/dJun
Nitrogen, Kjeldahl, total [as N]30-day average≤ 2052 lb/dall year
Nitrogen, Kjeldahl, total [as N]daily maximum≤ 3359 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
E. coligeometric mean≤ 489 #/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≤ 1345 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 2152 lb/dall year

New limits from Oct 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Phenols, 30-day average2.696 lb/dnew——
Phenols, 30-day average0.05035 mg/Lnew——
Phenols, daily maximum2.502 mg/Lnew——
Phenols, daily maximum134.5 lb/dnew——

How strict are these limits?

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

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0032484 · MCP: https://passage-data.com/mcp