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City of Gilbert

Sewage treatment plant, Gilbert, Iowa. NPDES permit IA0025968, in force until Oct 31, 2030. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (26 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 1 required value missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], 30-day average2.453875≤ 2.3 mg/L7%
October 2025Nitrogen, ammonia total [as N], daily maximum8.1457≤ 7.1 mg/L15%
July 2026Oxygen, dissolved [DO], daily minimum4.12≥ 4.9 mg/L16%

Limits in force (70)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.9 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≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 107 lb/dall year
Solids, total suspended7-day average≤ 160 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≤ 1.4 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 5.7 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 5.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 4.1 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 9.5 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 14 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 6.4 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 16.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.3 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 10.2 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 5.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 6.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 13.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 7.1 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 20.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 24.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 30.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 30.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 24.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 30.1 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 30.2 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 30.2 lb/dMay
E. coligeometric mean≤ 221 #/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≤ 89 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 142 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/IA0025968 · MCP: https://passage-data.com/mcp