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Gasoline Service Stations, Williams, Iowa. NPDES permit IA0082309, in force until Apr 30, 2031. Last 12 months: over a limit 11 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

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

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, 30-day average82≤ 80 mg/L3%
November 2025E. coli, geometric mean2426≤ 654 #/100mL271%
November 2025Nitrogen, ammonia total [as N], 30-day average14≤ 2.8 mg/L400%
November 2025Nitrogen, ammonia total [as N], 30-day average4.6704≤ 2.9 lb/d61%
November 2025Nitrogen, ammonia total [as N], daily maximum14≤ 2.8 mg/L400%
November 2025Nitrogen, ammonia total [as N], daily maximum4.6704≤ 2.9 lb/d61%
April 2026Nitrogen, ammonia total [as N], 30-day average6.754≤ 2.3 mg/L194%
April 2026Nitrogen, ammonia total [as N], daily maximum6.754≤ 4.9 mg/L38%
April 2026Solids, total suspended, 30-day average96≤ 80 mg/L20%
June 2026E. coli, geometric mean904≤ 654 #/100mL38%
June 2026Nitrogen, ammonia total [as N], 30-day average2.8645≤ 2 mg/L43%

Limits in force (59)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 20.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 8.7 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 5.4 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 2.1 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 1.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 2.7 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 1.6 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 3.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 2.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 2.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 4.2 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 6.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 20.9 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 3 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 9 lb/dFeb
Chloride [as Cl]30-day average≤ 435 mg/Lall year
Chloride [as Cl]daily maximum≤ 637 mg/Lall year
Chloride [as Cl]30-day average≤ 450 lb/dall year
Chloride [as Cl]daily maximum≤ 659 lb/dall year
E. coligeometric mean≤ 654 #/100mLMar–Nov
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

How strict are these limits?

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

Same industry: the 8 Automotive Dealers and Gasoline Service Stations permits in Iowa.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0082309 · MCP: https://passage-data.com/mcp