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City of Sioux Rapids

Sewage treatment plant, Sioux Rapids, Iowa. NPDES permit IA0042951, in force until Mar 31, 2030. Last 12 months: over a limit 17 times (last August 2026), 8 required values missing, 9 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (29 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 51 required values missing, 9 of 12 reports late

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

All 17 values over a limit
Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], 30-day average41.94≤ 25 mg/L68%
December 2025BOD, carbonaceous [5 day, 20 C], 7-day average74.2≤ 40 mg/L86%
December 2025Nitrogen, ammonia total [as N], 30-day average40.76≤ 40.7 mg/L0%
December 2025Nitrogen, ammonia total [as N], daily maximum42.7≤ 40.7 mg/L5%
January 2026BOD, carbonaceous [5 day, 20 C], 30-day average33.975≤ 25 mg/L36%
February 2026BOD, carbonaceous [5 day, 20 C], 30-day average43.325≤ 25 mg/L73%
February 2026BOD, carbonaceous [5 day, 20 C], 7-day average44.4≤ 40 mg/L11%
March 2026BOD, carbonaceous [5 day, 20 C], 30-day average36.65≤ 25 mg/L47%
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average41.7≤ 40 mg/L4%
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average31.76≤ 25 mg/L27%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average47.4≤ 40 mg/L19%
April 2026Nitrogen, ammonia total [as N], daily maximum42.2≤ 41.6 mg/L1%
April 2026Solids, total suspended, 30-day average94≤ 80 mg/L18%
May 2026E. coli, geometric mean142.088≤ 126 #/100mL13%
May 2026Solids, total suspended, 30-day average82≤ 80 mg/L3%
July 2026E. coli, geometric mean1517.111≤ 126 #/100mL1104%
August 2026E. coli, geometric mean1182.888≤ 126 #/100mL839%

Limits in force (73)

ParameterStatisticLimitMonths
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
pH30-day averagereport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 100 lb/dall year
Solids, total suspended7-day average≤ 150 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≤ 47.5 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 78.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 39.6 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 73.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 57.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 41.9 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 48.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 47.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 41.6 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 40.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 39.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 39.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 47.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 78.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 39.6 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 73.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 57.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 41.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 48.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 47.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 41.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 40.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 39.6 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 39.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 31.8 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 63 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 26.5 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 51.5 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 38.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 28 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 32.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 31.8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 28.9 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 27.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 26.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 26.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 31.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 63 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 26.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 51.5 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 38.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 28 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 32.2 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 31.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 28.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 27.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 26.5 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 26.5 lb/dOct
Chlorine, total residual30-day average≤ .17 mg/Lall year
Chlorine, total residualdaily maximum≤ .17 mg/Lall year
Chlorine, total residual30-day average≤ .12 lb/dall year
Chlorine, total residualdaily maximum≤ .12 lb/dall year
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
BOD, carbonaceous [5 day, 20 C]30-day average≤ 31 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 50 lb/dall year

New limits from Mar 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chromium, total [as Cr], 30-day average0.1005 lb/dnew——
Chromium, total [as Cr], 30-day average0.1444 mg/Lnew——
Chromium, total [as Cr], daily maximum0.1005 lb/dnew——
Chromium, total [as Cr], daily maximum0.1444 mg/Lnew——
Copper, total [as Cu], 30-day average0.166 lb/dnew——
Copper, total [as Cu], 30-day average0.2385 mg/Lnew——
Copper, total [as Cu], daily maximum0.166 lb/dnew——
Copper, total [as Cu], daily maximum0.2385 mg/Lnew——

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/IA0042951 · MCP: https://passage-data.com/mcp