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City of Niangua

Sewage treatment plant, Niangua, Missouri. NPDES permit MO0095109 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 17 times (last August 2026), 5 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (12 values), outfall 001 form Q quarterly (2 values), outfall INF form IM monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 3 of 28 reports late

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

All 17 values over a limit
Period endingParameterReportedLimitOver by
March 2026BOD, 5-day, percent removal, monthly average minimum78≥ 85 %47%
March 2026Solids, suspended percent removal, monthly average minimum78≥ 85 %47%
April 2026BOD, 5-day, percent removal, monthly average minimum84≥ 85 %7%
April 2026Nitrogen, ammonia total [as N], daily maximum6.4≤ 4.8 mg/L33%
April 2026Nitrogen, ammonia total [as N], monthly average6.4≤ 1.3 mg/L392%
May 2026BOD, 5-day, 20 deg. C, monthly average40≤ 30 mg/L33%
May 2026BOD, 5-day, percent removal, monthly average minimum75≥ 85 %67%
May 2026Nitrogen, ammonia total [as N], daily maximum15≤ 4.8 mg/L213%
May 2026Nitrogen, ammonia total [as N], monthly average15≤ 1.3 mg/L1054%
May 2026Solids, suspended percent removal, monthly average minimum74≥ 85 %73%
June 2026BOD, 5-day, percent removal, monthly average minimum83≥ 85 %13%
June 2026Nitrogen, ammonia total [as N], monthly average1.9≤ 1.3 mg/L46%
July 2026BOD, 5-day, percent removal, monthly average minimum81≥ 85 %27%
July 2026Nitrogen, ammonia total [as N], daily maximum7.6≤ 4.8 mg/L58%
July 2026Nitrogen, ammonia total [as N], monthly average7.6≤ 1.3 mg/L485%
August 2026Nitrogen, ammonia total [as N], daily maximum9.5≤ 4.8 mg/L98%
August 2026Nitrogen, ammonia total [as N], monthly average9.5≤ 1.3 mg/L631%

Limits in force (18)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
pHminimum≥ 6.5 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 maximum≤ 15 mg/Lall year001
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LApr–Sep001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
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.

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/MO0095109 · MCP: https://passage-data.com/mcp