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City of Lake Mills

Sewage treatment plant, Lake Mills, Iowa. NPDES permit IA0027448, in force until May 31, 2027. Last 12 months: over a limit 27 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (48 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
27 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 27 values over a limit
Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], 30-day average2.427675≤ 2.3 mg/L6%
November 2025Nitrogen, ammonia total [as N], daily maximum3.3843≤ 2.7 mg/L25%
December 2025Nitrogen, ammonia total [as N], 30-day average3.06486≤ 2.5 mg/L23%
January 2026Nitrogen, ammonia total [as N], 30-day average5.404825≤ 3.4 mg/L59%
January 2026Oxygen, dissolved [DO], daily minimum3.9≥ 5 mg/L22%
February 2026Nitrogen, ammonia total [as N], 30-day average8.682762≤ 4 mg/L117%
February 2026Nitrogen, ammonia total [as N], daily maximum9.2532≤ 8.4 mg/L10%
February 2026Oxygen, dissolved [DO], daily minimum3.7≥ 5 mg/L26%
March 2026Nitrogen, ammonia total [as N], 30-day average7.173877≤ 3.4 mg/L111%
March 2026Nitrogen, ammonia total [as N], daily maximum9.1591≤ 3.9 mg/L135%
March 2026Oxygen, dissolved [DO], daily minimum2.2≥ 5 mg/L56%
March 2026pH, daily maximum9.03≤ 9 SU—
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average30.57142≤ 25 mg/L22%
April 2026Nitrogen, ammonia total [as N], 30-day average14.63139≤ 9.5 lb/d54%
April 2026Nitrogen, ammonia total [as N], 30-day average3.996042≤ 1.5 mg/L166%
April 2026Nitrogen, ammonia total [as N], daily maximum6.8646≤ 4.7 mg/L46%
April 2026Oxygen, dissolved [DO], daily minimum.9≥ 5 mg/L82%
April 2026pH, daily maximum9.78≤ 9 SU—
June 2026Nitrogen, ammonia total [as N], 30-day average3.0432≤ 1.3 mg/L134%
June 2026Nitrogen, ammonia total [as N], daily maximum4.2289≤ 3.2 mg/L32%
June 2026Oxygen, dissolved [DO], daily minimum.88≥ 5 mg/L82%
July 2026Nitrogen, ammonia total [as N], 30-day average1.707711≤ 1 mg/L71%
July 2026Nitrogen, ammonia total [as N], daily maximum3.7203≤ 3.2 mg/L16%
July 2026Oxygen, dissolved [DO], daily minimum1.14≥ 5 mg/L77%
July 2026pH, daily maximum9.37≤ 9 SU—
August 2026Oxygen, dissolved [DO], daily minimum2.9≥ 5 mg/L42%
August 2026pH, daily maximum9.93≤ 9 SU—

Limits in force (136)

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≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 500 lb/dall year
Solids, total suspended7-day average≤ 751 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 average≤ 153.7 lb/dall year
Nitrogen, total [as N]daily maximum≤ 251.6 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 24.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 14.5 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 6.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 9.7 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 6 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 9.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 21.3 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 15.5 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 10.9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 8.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 6.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 21.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 52.6 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 20 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 29.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 24.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 24.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 20 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 20 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 124.4 lb/dJan
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
Cyanide, total [as CN]30-day average≤ .0052 mg/Lall year
Cyanide, total [as CN]daily maximum≤ .022 mg/Lall year
Cyanide, total [as CN]30-day average≤ .03253 lb/dall year
Cyanide, total [as CN]daily maximum≤ .1376 lb/dall year
Chromium, hexavalent [as Cr]30-day average≤ .01143 mg/Lall year
Chromium, hexavalent [as Cr]daily maximum≤ .01629 mg/Lall year
Chromium, hexavalent [as Cr]30-day average≤ .07152 lb/dall year
Chromium, hexavalent [as Cr]daily maximum≤ .1019 lb/dall year
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .1055 lb/dall year
Copper, total [as Cu]daily maximum≤ .1683 lb/dall year
Silver, total [as Ag]30-day average≤ .01247 mg/Lall year
Silver, total [as Ag]daily maximum≤ .01247 mg/Lall year
Silver, total [as Ag]30-day average≤ .07798 lb/dall year
Silver, total [as Ag]daily maximum≤ .07798 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LApr
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LOct
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LDec
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LJun
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LNov
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LJul
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LFeb
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LSep
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LAug
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LMay
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LJan
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/LMar
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LApr
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LOct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LDec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LJun
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LNov
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LJul
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LFeb
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LSep
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LAug
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LMay
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LJan
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LMar
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dApr
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dOct
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dDec
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dJun
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dNov
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dJul
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dFeb
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dSep
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dAug
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dMay
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dJan
BOD, carbonaceous [5 day, 20 C]30-day average≤ 156 lb/dMar
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dApr
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dOct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dDec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dJun
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dNov
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dJul
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dFeb
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dSep
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dAug
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dMay
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dJan
BOD, carbonaceous [5 day, 20 C]7-day average≤ 250 lb/dMar

New limits from May 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], 30-day average389 mg/Lnew——
Chloride [as Cl], 30-day average2431 lb/dnew——
Chloride [as Cl], daily maximum3933 lb/dnew——
Chloride [as Cl], daily maximum629 mg/Lnew——

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0027448 · MCP: https://passage-data.com/mcp