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

Denison Municipal Utilities

Sewage treatment plant, major discharger, Denison, Iowa. NPDES permit IA0023302, in force until Apr 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (48 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (92)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 3.3 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≥ 6.4 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≤ 1043 lb/dall year
Solids, total suspended7-day average≤ 1565 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≤ 5.1 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 8.2 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 6.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 7.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 13 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 11.3 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 5.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.3 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 18.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 163.4 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 260 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 213.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 244.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 159.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 137.3 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 412.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 359.3 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 182 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 110.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 105 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 99.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 562.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 571.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 529.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 526.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 562.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 519.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 515.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 547.9 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 545.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 590.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 631.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 582.8 lb/dAug
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
Chloride [as Cl]30-day average≤ 564 mg/Lall year
Chloride [as Cl]daily maximum≤ 652 mg/Lall year
Chloride [as Cl]30-day average≤ 18870 lb/dall year
Chloride [as Cl]daily maximum≤ 22587 lb/dall year
Copper, total [as Cu]30-day average≤ .02519 mg/Lall year
Copper, total [as Cu]daily maximum≤ .02796 mg/Lall year
Copper, total [as Cu]30-day average≤ .8412 lb/dall year
Copper, total [as Cu]daily maximum≤ .9679 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≤ 869 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1391 lb/dall year

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/IA0023302 · MCP: https://passage-data.com/mcp