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Iowa State University

Colleges And Universities, Ames, Iowa. NPDES permit IA0032697, in force until Oct 31, 2029. Last 12 months: over a limit 4 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (24 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 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
October 2025Chloride [as Cl], 30-day average405≤ 389 mg/L4%
November 2025Chloride [as Cl], 30-day average438≤ 389 mg/L13%
December 2025Chloride [as Cl], 30-day average463≤ 389 mg/L19%
December 2025Sulfate, total [as SO4], 30-day average1990≤ 1514 mg/L31%

Limits in force (46)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FFeb
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FMay
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FAug
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FJun
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FNov
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FOct
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FApr
Temperature, water deg. fahrenheit30-day average≤ 83.9 deg FJan
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FJul
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FSep
Temperature, water deg. fahrenheit30-day average≤ 83.9 deg FDec
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FMar
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FFeb
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FMay
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FAug
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FJun
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FNov
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FOct
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FApr
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FJan
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FJul
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FSep
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FDec
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FMar
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 760 mg/Lall year
Chloride [as Cl]30-day average≤ 1306 lb/dall year
Chloride [as Cl]daily maximum≤ 2553 lb/dall year
Sulfate, total [as SO4]30-day average≤ 1514 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 2000 mg/Lall year
Sulfate, total [as SO4]30-day average≤ 5088 lb/dall year
Sulfate, total [as SO4]daily maximum≤ 6722 lb/dall year
Chromium, hexavalent [as Cr]30-day average≤ .011 mg/Lall year
Chromium, hexavalent [as Cr]daily maximum≤ .016 mg/Lall year
Chromium, hexavalent [as Cr]30-day average≤ .038 lb/dall year
Chromium, hexavalent [as Cr]daily maximum≤ .055 lb/dall year
Iron, total [as Fe]30-day average≤ 1 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year
Iron, total [as Fe]30-day average≤ 3.05 lb/dall year
Iron, total [as Fe]daily maximum≤ 3.05 lb/dall year
Chlorine, total residual30-day average≤ .017 mg/Lall year
Chlorine, total residualdaily maximum≤ .03 mg/Lall year
Chlorine, total residual30-day average≤ .055 lb/dall year
Chlorine, total residualdaily maximum≤ .094 lb/dall year

How strict are these limits?

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

Same industry: the 30 Educational Services 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/IA0032697 · MCP: https://passage-data.com/mcp