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City of Danville

Sewage treatment plant, Danville, Iowa. NPDES permit IA0025861 expired Nov 30, 2024; its limits still apply. Last 12 months: over a limit 37 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (26 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
25 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 37 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], 30-day average7.3775≤ 1.6 mg/L361%
October 2025Nitrogen, ammonia total [as N], daily maximum11.7≤ 2.7 mg/L333%
October 2025Oxygen, dissolved [DO], daily minimum.65≥ 5 mg/L87%
November 2025Nitrogen, ammonia total [as N], 30-day average15.2≤ 2.3 mg/L561%
November 2025Nitrogen, ammonia total [as N], daily maximum16.1≤ 2.7 mg/L496%
November 2025Oxygen, dissolved [DO], daily minimum1.4≥ 5 mg/L72%
December 2025Nitrogen, ammonia total [as N], 30-day average19.68≤ 2.5 mg/L687%
December 2025Nitrogen, ammonia total [as N], daily maximum24.1≤ 3.9 mg/L518%
December 2025Oxygen, dissolved [DO], daily minimum1.4≥ 5 mg/L72%
January 2026Nitrogen, ammonia total [as N], 30-day average18.775≤ 3.4 mg/L452%
January 2026Nitrogen, ammonia total [as N], daily maximum20≤ 19.9 mg/L1%
January 2026Oxygen, dissolved [DO], daily minimum2.6≥ 5 mg/L48%
February 2026Nitrogen, ammonia total [as N], 30-day average17.1≤ 4 mg/L328%
February 2026Nitrogen, ammonia total [as N], daily maximum20.5≤ 8.4 mg/L144%
February 2026Oxygen, dissolved [DO], daily minimum1.8≥ 5 mg/L64%
March 2026Nitrogen, ammonia total [as N], 30-day average7.668≤ 3.4 mg/L126%
March 2026Nitrogen, ammonia total [as N], daily maximum12.6≤ 3.9 mg/L223%
March 2026Oxygen, dissolved [DO], daily minimum.6≥ 5 mg/L88%
March 2026pH, daily maximum9.7≤ 9 SU—
April 2026Nitrogen, ammonia total [as N], 30-day average2.8325≤ 1.5 mg/L89%
April 2026Nitrogen, ammonia total [as N], daily maximum5.25≤ 4.7 mg/L12%
April 2026Oxygen, dissolved [DO], daily minimum.6≥ 5 mg/L88%
April 2026pH, daily maximum9.7≤ 9 SU—
May 2026Nitrogen, ammonia total [as N], 30-day average11.6≤ 1.7 mg/L582%
May 2026Nitrogen, ammonia total [as N], daily maximum11.6≤ 3.2 mg/L263%
May 2026Oxygen, dissolved [DO], daily minimum.7≥ 5 mg/L86%
June 2026Nitrogen, ammonia total [as N], 30-day average6.874≤ 1.3 mg/L429%
June 2026Nitrogen, ammonia total [as N], daily maximum12.4≤ 3.2 mg/L288%
June 2026Oxygen, dissolved [DO], daily minimum.33≥ 5 mg/L93%
July 2026Oxygen, dissolved [DO], daily minimum.75≥ 5 mg/L85%
August 2026Nitrogen, ammonia total [as N], 30-day average3.62≤ 1 mg/L262%
August 2026Nitrogen, ammonia total [as N], daily maximum3.62≤ 2.7 mg/L34%
August 2026Oxygen, dissolved [DO], daily minimum1.3≥ 5 mg/L74%
September 2026E. coli, geometric mean2046.249≤ 630 #/100mL225%
September 2026Nitrogen, ammonia total [as N], 30-day average3.7072≤ 1.1 mg/L237%
September 2026Nitrogen, ammonia total [as N], daily maximum6.02≤ 2.7 mg/L123%
September 2026Oxygen, dissolved [DO], daily minimum1.1≥ 5 mg/L78%

Limits in force (70)

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≤ 554 lb/dall year
Solids, total suspended7-day average≤ 831 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, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
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≤ 2.5 mg/LDec
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≤ 1.1 mg/LSep
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]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
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≤ 3.9 mg/LDec
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≤ 2.7 mg/LSep
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]30-day average≤ 27.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 23.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 16.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 12 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 9.1 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 17.1 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 10.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 6.6 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 10.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 23.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 58.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 137.7 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 22.2 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 22.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 22.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 26.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 32.6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 26.9 lb/dMar
E. coligeometric mean≤ 630 #/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≤ 173 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 277 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/IA0025861 · MCP: https://passage-data.com/mcp