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City of Chariton

Sewage treatment plant, major discharger, Chariton, Iowa. NPDES permit IA0028924, in force until Jul 31, 2029. Last 12 months: over a limit 10 times (last August 2026), 4 required values missing, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (44 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025Copper, total [as Cu], 30-day average.0574≤ .01687 mg/L240%
December 2025Copper, total [as Cu], 30-day average.162763≤ .1569 lb/d4%
December 2025Copper, total [as Cu], daily maximum.0574≤ .0269 mg/L113%
May 2026Copper, total [as Cu], 30-day average.0177≤ .01687 mg/L5%
June 2026Nitrogen, ammonia total [as N], 30-day average2.59375≤ 1.3 mg/L100%
June 2026Nitrogen, ammonia total [as N], 30-day average27.87475≤ 12.2 lb/d128%
June 2026Nitrogen, ammonia total [as N], daily maximum10.8≤ 5.7 mg/L89%
June 2026Nitrogen, ammonia total [as N], daily maximum114.2112≤ 53 lb/d115%
June 2026Solids, total suspended, 7-day average472.0606≤ 418 lb/d13%
August 2026Copper, total [as Cu], 30-day average.161058≤ .1569 lb/d3%

Limits in force (88)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 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≤ 279 lb/dall year
Solids, total suspended7-day average≤ 418 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, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
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≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 5.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 5.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 16.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 36.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 12.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 9.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 14.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 23 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 8.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 21.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 30 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 31.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 14.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 9.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 111 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 51 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 51 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 111 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dSep
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .1569 lb/dall year
Copper, total [as Cu]daily maximum≤ .2501 lb/dall year
E. coligeometric mean≤ 630 #/100mLMar–Nov
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year
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≤ 232 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 372 lb/dall year

New limits from Jul 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Hexachlorobenzene, 30-day average0.00000546 mg/Lnew——
Hexachlorobenzene, 30-day average0.00003994 lb/dnew——
Hexachlorobenzene, daily maximum0.00000546 mg/Lnew——
Hexachlorobenzene, daily maximum0.00003994 lb/dnew——

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

Your permit document is the final word. As JSON: /api/v1/permits/IA0028924 · MCP: https://passage-data.com/mcp