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City of Nashua

Sewage treatment plant, Nashua, Iowa. NPDES permit IA0024503, in force until Sep 30, 2027. Last 12 months: over a limit 7 times (last July 2026), 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (27 values)
Renewal application due
Apr 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average31≤ 25 mg/L24%
April 2026Solids, total suspended, 30-day average39.75≤ 30 mg/L33%
April 2026Solids, total suspended, 7-day average64≤ 45 mg/L42%
July 2026Chlorine, total residual, 30-day average.34≤ .293 mg/L16%
July 2026Chlorine, total residual, 30-day average.432595≤ .316 lb/d37%
July 2026Chlorine, total residual, daily maximum1.4≤ .293 mg/L378%
July 2026Chlorine, total residual, daily maximum2.241792≤ .316 lb/d609%

Limits in force (27)

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≥ 6.5 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≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 57 lb/dall year
Solids, total suspended7-day average≤ 86 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≤ 45.1 lb/dall year
Nitrogen, total [as N]daily maximum≤ 140.3 lb/dall year
Chlorine, total residual30-day average≤ .293 mg/Lall year
Chlorine, total residualdaily maximum≤ .293 mg/Lall year
Chlorine, total residual30-day average≤ .316 lb/dall year
Chlorine, total residualdaily maximum≤ .316 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≤ 47 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 76 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/IA0024503 · MCP: https://passage-data.com/mcp