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City of Welton

Sewage treatment plant, Welton, Iowa. NPDES permit IA0071196, in force until Jan 31, 2030. Last 12 months: over a limit 2 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (20 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 8 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], 30-day average60≤ 25 mg/L140%
December 2025BOD, carbonaceous [5 day, 20 C], 7-day average60≤ 40 mg/L50%

Limits in force (20)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 2.1 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≥ 6.3 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 8 lb/dall year
Solids, total suspended7-day average≤ 12 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
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≤ 7 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 11 lb/dall year

New limits from Jun 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], 30-day average0.8 lb/d (Sep)new——
Nitrogen, ammonia total [as N], 30-day average2.8 mg/L (Sep)new——
Nitrogen, ammonia total [as N], 30-day average6.7 mg/L (Dec)new——
Nitrogen, ammonia total [as N], 30-day average1.8 lb/d (Dec)new——
Nitrogen, ammonia total [as N], 30-day average2.5 lb/d (Jan)new——
Nitrogen, ammonia total [as N], 30-day average9.2 mg/L (Jan)new——
Nitrogen, ammonia total [as N], 30-day average9 mg/L (Mar)new——
Nitrogen, ammonia total [as N], 30-day average2.5 lb/d (Mar)new——
Nitrogen, ammonia total [as N], 30-day average10.6 mg/L (Feb)new——
Nitrogen, ammonia total [as N], 30-day average1.1 lb/d (Apr)new——
Nitrogen, ammonia total [as N], 30-day average4.1 mg/L (Apr)new——
Nitrogen, ammonia total [as N], 30-day average1.3 lb/d (May)new——
Nitrogen, ammonia total [as N], 30-day average2.9 lb/d (Feb)new——
Nitrogen, ammonia total [as N], 30-day average4.7 mg/L (May)new——
Nitrogen, ammonia total [as N], 30-day average0.7 lb/d (Jul)new——
Nitrogen, ammonia total [as N], 30-day average2.7 mg/L (Jul)new——
Nitrogen, ammonia total [as N], 30-day average2.6 mg/L (Aug)new——
Nitrogen, ammonia total [as N], 30-day average0.7 lb/d (Aug)new——
Nitrogen, ammonia total [as N], 30-day average1 lb/d (Jun)new——
Nitrogen, ammonia total [as N], 30-day average3.5 mg/L (Jun)new——
Nitrogen, ammonia total [as N], 30-day average1.7 lb/d (Nov)new——
Nitrogen, ammonia total [as N], 30-day average6.3 mg/L (Nov)new——
Nitrogen, ammonia total [as N], 30-day average4.2 mg/L (Oct)new——
Nitrogen, ammonia total [as N], 30-day average1.2 lb/d (Oct)new——
Nitrogen, ammonia total [as N], daily maximum17.5 mg/L (Sep)new——
Nitrogen, ammonia total [as N], daily maximum4.8 lb/d (Sep)new——
Nitrogen, ammonia total [as N], daily maximum16.9 mg/L (Dec)new——
Nitrogen, ammonia total [as N], daily maximum4.7 lb/d (Dec)new——
Nitrogen, ammonia total [as N], daily maximum4.5 lb/d (Jan)new——
Nitrogen, ammonia total [as N], daily maximum16.3 mg/L (Jan)new——
Nitrogen, ammonia total [as N], daily maximum4.6 lb/d (Apr)new——
Nitrogen, ammonia total [as N], daily maximum16.2 mg/L (May)new——
Nitrogen, ammonia total [as N], daily maximum15.8 mg/L (Mar)new——
Nitrogen, ammonia total [as N], daily maximum4.3 lb/d (Mar)new——
Nitrogen, ammonia total [as N], daily maximum16.6 mg/L (Apr)new——
Nitrogen, ammonia total [as N], daily maximum4.5 lb/d (May)new——
Nitrogen, ammonia total [as N], daily maximum15.4 mg/L (Feb)new——
Nitrogen, ammonia total [as N], daily maximum4.2 lb/d (Feb)new——
Nitrogen, ammonia total [as N], daily maximum5.1 lb/d (Jul)new——
Nitrogen, ammonia total [as N], daily maximum18.7 mg/L (Jul)new——
Nitrogen, ammonia total [as N], daily maximum17.3 mg/L (Aug)new——
Nitrogen, ammonia total [as N], daily maximum4.8 lb/d (Aug)new——
Nitrogen, ammonia total [as N], daily maximum15.4 mg/L (Jun)new——
Nitrogen, ammonia total [as N], daily maximum4.2 lb/d (Jun)new——
Nitrogen, ammonia total [as N], daily maximum4.3 lb/d (Nov)new——
Nitrogen, ammonia total [as N], daily maximum15.6 mg/L (Nov)new——
Nitrogen, ammonia total [as N], daily maximum16.6 mg/L (Oct)new——
Nitrogen, ammonia total [as N], daily maximum4.6 lb/d (Oct)new——

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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