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City of Grand River

Sewage treatment plant, Grand River, Iowa. NPDES permit IA0066346, in force until Apr 30, 2028. Last 12 months: over a limit 6 times (last December 2025), 78 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 (10 values)
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
May 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], 30-day average37≤ 25 mg/L48%
December 2025BOD, carbonaceous [5 day, 20 C], 7-day average47≤ 40 mg/L18%
December 2025Nitrogen, ammonia total [as N], 30-day average16.25≤ 4.4 mg/L269%
December 2025Nitrogen, ammonia total [as N], daily maximum21.2≤ 4.4 mg/L382%
December 2025Solids, total suspended, 30-day average378≤ 80 mg/L373%
December 2025Solids, total suspended, 7-day average668≤ 120 mg/L457%

Limits in force (54)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.2 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 9.7 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 5.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 14 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 9.7 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 5.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 21.4 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 5.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 8.3 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 16.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 9.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 23.4 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 6.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 5.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.7 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 35.7 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 lb/dJul
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

New limits from Apr 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
E. coli, geometric mean126 #/100mL (Mar–Nov)new——

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/IA0066346 · MCP: https://passage-data.com/mcp