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City of Ruthven

Sewage treatment plant, Ruthven, Iowa. NPDES permit IA0032441, in force until May 31, 2028. Last 12 months: over a limit 4 times (last April 2026), 3 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (30 values)
Renewal application due
Dec 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 1 required value missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], 30-day average5.6725≤ 3.6 mg/L58%
November 2025Nitrogen, ammonia total [as N], daily maximum9.6≤ 5.9 mg/L63%
December 2025pH, daily maximum10.5≤ 9 SU—
April 2026pH, daily maximum12.4≤ 9 SU—

Limits in force (74)

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≤ 88 lb/dall year
Solids, total suspended7-day average≤ 131 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≤ 3.8 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 5.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 8.5 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 11.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 13.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 3.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 4.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 3.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 11.7 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 6 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 5.4 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 8 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 20.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 24.8 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 24.7 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 24.7 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 24.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 24.7 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 20.4 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 lb/dNov
Chloride [as Cl]30-day averagereport only (mg/L)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Chloride [as Cl]30-day averagereport only (lb/d)all year
Chloride [as Cl]daily maximumreport only (lb/d)all year
E. coligeometric mean≤ 630 #/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≤ 73 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 117 lb/dall year

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

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