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Diamondhead Sanitary District

Civic And Social Associations, Dexter, Iowa. NPDES permit IA0068381, in force until May 31, 2029. Last 12 months: over a limit 12 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 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
November 2025E. coli, geometric mean2318.62≤ 126 #/100mL1740%
November 2025Nitrogen, ammonia total [as N], 30-day average29.61004≤ 10.9 lb/d172%
November 2025Nitrogen, ammonia total [as N], 30-day average7.735≤ 2.3 mg/L236%
November 2025Nitrogen, ammonia total [as N], daily maximum10.5≤ 2.7 mg/L289%
November 2025Nitrogen, ammonia total [as N], daily maximum40.19463≤ 12.5 lb/d222%
May 2026Nitrogen, ammonia total [as N], 30-day average28.69969≤ 8.2 lb/d250%
May 2026Nitrogen, ammonia total [as N], 30-day average7.53≤ 1.7 mg/L343%
May 2026Nitrogen, ammonia total [as N], daily maximum10.5≤ 3.2 mg/L228%
May 2026Nitrogen, ammonia total [as N], daily maximum40.01949≤ 15.1 lb/d165%
September 2026Nitrogen, ammonia total [as N], 30-day average3.17≤ 1.1 mg/L188%
September 2026Nitrogen, ammonia total [as N], 30-day average8.618722≤ 5 lb/d72%
September 2026Nitrogen, ammonia total [as N], daily maximum3.17≤ 2.7 mg/L17%

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≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 6.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 7.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 16 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 10.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 4.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 8.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 11.6 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 4.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 18.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 16 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 22.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 93.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 18.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 39.5 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 18.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 lb/dSep
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.

Same industry: the 24 Membership Organizations permits in Iowa.

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Your permit document is the final word. As JSON: /api/v1/permits/IA0068381 · MCP: https://passage-data.com/mcp