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City of Iron Mountain Lake

Sewage treatment plant, Iron Mountain, Missouri. NPDES permit MO0122581, in force until Dec 31, 2027. Last 12 months: over a limit 25 times (last July 2026), 5 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (14 values), outfall 001 form Q quarterly (2 values), outfall INF form IM monthly (2 values)
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
July 2026
Oct 2024 – Sep 2025
45 values over a limit, 0 required values missing, 0 of 28 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, 30-day geometric mean172≤ 126 #/100mL37%
November 2025BOD, 5-day, 20 deg. C, monthly average42≤ 30 mg/L40%
November 2025BOD, 5-day, percent removal, monthly average minimum81≥ 85 %27%
November 2025Nitrogen, ammonia total [as N], daily maximum44.5≤ 12.4 mg/L259%
November 2025Nitrogen, ammonia total [as N], monthly average44.5≤ 9.3 mg/L378%
January 2026BOD, 5-day, percent removal, monthly average minimum81≥ 85 %27%
February 2026BOD, 5-day, 20 deg. C, monthly average57.8≤ 30 mg/L93%
February 2026BOD, 5-day, 20 deg. C, weekly average57.8≤ 45 mg/L28%
February 2026BOD, 5-day, percent removal, monthly average minimum74≥ 85 %73%
February 2026Nitrogen, ammonia total [as N], daily maximum15.4≤ 10.3 mg/L50%
February 2026Nitrogen, ammonia total [as N], monthly average15.4≤ 8.1 mg/L90%
March 2026BOD, 5-day, percent removal, monthly average minimum84≥ 85 %7%
March 2026Nitrogen, ammonia total [as N], daily maximum31.3≤ 12.4 mg/L152%
March 2026Nitrogen, ammonia total [as N], monthly average31.3≤ 9.3 mg/L237%
April 2026E. coli, 30-day geometric mean649≤ 126 #/100mL415%
April 2026E. coli, 7-day geometric mean649≤ 630 #/100mL3%
April 2026Nitrogen, ammonia total [as N], daily maximum26.1≤ 12.4 mg/L110%
April 2026Nitrogen, ammonia total [as N], monthly average26.1≤ 8.1 mg/L222%
May 2026Nitrogen, ammonia total [as N], daily maximum29≤ 12.4 mg/L134%
May 2026Nitrogen, ammonia total [as N], monthly average29≤ 6.6 mg/L339%
June 2026E. coli, 30-day geometric mean209≤ 126 #/100mL66%
June 2026Nitrogen, ammonia total [as N], daily maximum31.2≤ 12.4 mg/L152%
June 2026Nitrogen, ammonia total [as N], monthly average31.2≤ 5.1 mg/L512%
July 2026E. coli, 30-day geometric mean272≤ 126 #/100mL116%
July 2026Nitrogen, ammonia total [as N], monthly average9.1≤ 4.3 mg/L112%

Limits in force (34)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year001
Oil and grease [soxhlet extr.] tot.monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 10.3 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LJan, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 10.3 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 3.8 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 9.3 mg/LJan, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 6.6 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 8.1 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 7.4 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 8.1 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 5.1 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 4.3 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LSep001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
E. coli7-day geometric mean≤ 630 #/100mLApr–Oct001
E. coli30-day geometric mean≤ 126 #/100mLApr–Oct001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/MO0122581 · MCP: https://passage-data.com/mcp