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Southern Iowa Rural Water Association

Sewage treatment plant, Davis City, Iowa. NPDES permit IA0060232, in force until Jul 31, 2030. Last 12 months: over a limit 11 times (last September 2026), 20 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (24 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
13 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
October 2025Solids, total suspended, 30-day average110≤ 80 mg/L38%
October 2025pH, daily maximum9.1≤ 9 SU—
November 2025E. coli, geometric mean3728.175≤ 224 #/100mL1564%
March 2026E. coli, geometric mean720≤ 224 #/100mL221%
April 2026E. coli, geometric mean10000≤ 224 #/100mL4364%
May 2026E. coli, geometric mean378.7405≤ 224 #/100mL69%
May 2026Nitrogen, ammonia total [as N], 30-day average2.5≤ 2.1 mg/L19%
June 2026E. coli, geometric mean320≤ 224 #/100mL43%
August 2026E. coli, geometric mean3244.303≤ 224 #/100mL1348%
August 2026Nitrogen, ammonia total [as N], 30-day average2.1≤ 1.3 mg/L62%
September 2026E. coli, geometric mean250≤ 224 #/100mL12%

Limits in force (68)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 1 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 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
Solids, total suspended30-day average≤ 60 lb/dall year
Solids, total suspended7-day average≤ 90 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≤ 1.3 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.1 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ .9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ .9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 1.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 1.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ .9 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 2.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 3.1 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 2.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 6.6 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.1 lb/dNov
E. coligeometric mean≤ 224 #/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≤ 19 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 lb/dall year

How strict are these limits?

Cited limits by parameter: Iowa's rules and the federal ones.

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