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Terrace Hill Sanitary District STP

Sewage treatment plant, Hampton, Iowa. NPDES permit IA0062472, in force until Jan 31, 2030. Last 12 months: over a limit 14 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 2 of 12 reports late

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

All 14 values over a limit
Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], 30-day average11≤ 2.8 mg/L293%
November 2025Nitrogen, ammonia total [as N], 30-day average3.2109≤ 3.2 lb/d0%
November 2025Nitrogen, ammonia total [as N], daily maximum11≤ 2.8 mg/L293%
November 2025Nitrogen, ammonia total [as N], daily maximum3.2109≤ 3.2 lb/d0%
December 2025BOD, carbonaceous [5 day, 20 C], 30-day average76≤ 25 mg/L204%
December 2025BOD, carbonaceous [5 day, 20 C], 7-day average76≤ 40 mg/L90%
December 2025Nitrogen, ammonia total [as N], 30-day average14≤ 4 mg/L250%
December 2025Nitrogen, ammonia total [as N], daily maximum14≤ 4 mg/L250%
December 2025Solids, total suspended, 30-day average82≤ 80 mg/L3%
May 2026Nitrogen, ammonia total [as N], 30-day average7.985≤ 4 mg/L100%
May 2026Nitrogen, ammonia total [as N], daily maximum7.985≤ 4 mg/L100%
June 2026E. coli, geometric mean2805.622≤ 126 #/100mL2127%
June 2026Nitrogen, ammonia total [as N], 30-day average5.5333≤ 3.6 mg/L54%
June 2026Nitrogen, ammonia total [as N], daily maximum5.5333≤ 4 mg/L38%

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 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≤ 4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 7.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 5.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 8.3 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 20.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 2.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 4.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 3.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 4.6 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 2.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 8.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 6 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 2.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 9.3 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.1 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 3.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 22.7 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 9.7 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 lb/dOct
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

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/IA0062472 · MCP: https://passage-data.com/mcp