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City of Lamar

Sewage treatment plant, Lamar, Missouri. NPDES permit MO0044172 expired Mar 31, 2023; its limits still apply. Last 12 months: over a limit 5 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (4 values), form B quarterly (30 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
December 2025Copper, total recoverable, monthly average14≤ 8 ug/L75%
December 2025Nitrogen, ammonia total [as N], monthly average9.9≤ 2.7 mg/L267%
December 2025Zinc, total recoverable, monthly average85.9≤ 65.1 ug/L32%
March 2026Zinc, total recoverable, monthly average164≤ 65.1 ug/L152%
June 2026Nitrogen, ammonia total [as N], monthly average5.09≤ 1.3 mg/L292%

Limits in force (36)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 mg/LApr–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 11.1 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LApr–Sep
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LJan, Feb, Mar, Oct, Nov, Dec
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Cyanide, free [amenable to chlorination]daily maximum≤ 10 ug/Lall year
Cyanide, free [amenable to chlorination]monthly average≤ 10 ug/Lall year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Iron, total recoverabledaily maximumreport only (ug/L)all year
Iron, total recoverablemonthly averagereport only (ug/L)all year
Zinc, total recoverabledaily maximum≤ 204.6 ug/Lall year
Zinc, total recoverablemonthly average≤ 65.1 ug/Lall year
Copper, total recoverabledaily maximum≤ 25.4 ug/Lall year
Copper, total recoverablemonthly average≤ 8 ug/Lall year
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year
Chromium, trivalent total recoverabledaily maximumreport only (ug/L)all year
Chromium, trivalent total recoverablemonthly averagereport only (ug/L)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
E. coli7-day geometric mean≤ 1030 #/100mLApr–Oct
E. coli30-day geometric mean≤ 206 #/100mLApr–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Missouri'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/MO0044172 · MCP: https://passage-data.com/mcp