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City of Armstrong

Sewage treatment plant, Armstrong, Iowa. NPDES permit IA0028517, in force until May 31, 2027. Last 12 months: over a limit 6 times (last April 2026), 8 required values missing, 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (42 values)
Renewal application due
Dec 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
18 values over a limit, 34 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], 30-day average13≤ 12.2 mg/L7%
February 2026Nitrogen, ammonia total [as N], daily maximum14≤ 12.2 mg/L15%
March 2026BOD, carbonaceous [5 day, 20 C], 30-day average31.75≤ 25 mg/L27%
March 2026Nitrogen, ammonia total [as N], 30-day average10.625≤ 6.6 mg/L61%
March 2026Nitrogen, ammonia total [as N], daily maximum12≤ 6.6 mg/L82%
April 2026Nitrogen, ammonia total [as N], daily maximum6.9≤ 6.4 mg/L8%

Limits in force (86)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 2 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≥ 6.2 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≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 217 lb/dall year
Solids, total suspended7-day average≤ 325 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
Oil & Grease30-day average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 12.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 6.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 6 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 13.4 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 6.4 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 12.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 6.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 51 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 23.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 13.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 11.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 7.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 33.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 17.8 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 8.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 16.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 8.1 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 13.2 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 7.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 12 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 36.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 17.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 13.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 13.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 33.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 17.8 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 16.4 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 11.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 12 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 63 lb/dJan
Nitrogen, nitrate total [as N]30-day average≤ 63 lb/dall year
Nitrogen, nitrate total [as N]daily maximum≤ 103 lb/dall year
Cyanide, total [as CN]30-day average≤ .02107 mg/Lall year
Cyanide, total [as CN]daily maximum≤ .04384 mg/Lall year
Cyanide, total [as CN]30-day average≤ .0571 lb/dall year
Cyanide, total [as CN]daily maximum≤ .1188 lb/dall year
Chloride [as Cl]30-day averagereport only (mg/L)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Chloride [as Cl]30-day averagereport only (lb/d)all year
Chloride [as Cl]daily maximumreport only (lb/d)all year
Copper, total [as Cu]30-day average≤ .05361 mg/Lall year
Copper, total [as Cu]daily maximum≤ .05361 mg/Lall year
Copper, total [as Cu]30-day average≤ .1453 lb/dall year
Copper, total [as Cu]daily maximum≤ .1453 lb/dall year
E. coligeometric mean≤ 126 #/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
BOD, carbonaceous [5 day, 20 C]30-day average≤ 68 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 108 lb/dall year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0028517 · MCP: https://passage-data.com/mcp