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City of ST. Ansgar

Sewage treatment plant, Saint Ansgar, Iowa. NPDES permit IA0033723, in force until Mar 31, 2030. Last 12 months: over a limit 10 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (23 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
11 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
December 2025Solids, total suspended, 30-day average92≤ 80 mg/L15%
December 2025Solids, total suspended, 7-day average158≤ 120 mg/L32%
February 2026pH, daily maximum9.01≤ 9 SU—
April 2026pH, daily maximum9.58≤ 9 SU—
May 2026Solids, total suspended, 30-day average84≤ 80 mg/L5%
May 2026pH, daily maximum9.76≤ 9 SU—
June 2026pH, daily maximum9.77≤ 9 SU—
July 2026Solids, total suspended, 30-day average98.5≤ 80 mg/L23%
July 2026Solids, total suspended, 7-day average192≤ 120 mg/L60%
July 2026pH, daily maximum9.29≤ 9 SU—

Limits in force (23)

ParameterStatisticLimitMonths
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 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≤ 120 lb/dall year
Solids, total suspended7-day average≤ 180 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≤ 52.8 lb/dall year
Nitrogen, total [as N]daily maximum≤ 86.5 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≤ 37 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 60 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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0033723 · MCP: https://passage-data.com/mcp