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City of Ozark

Sewage treatment plant, major discharger, Ozark, Missouri. NPDES permit MO0099163, in force until Sep 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (24 values), outfall 001 form Q quarterly (12 values), outfall INF form IM monthly (10 values), outfall SM2 form DM monthly (2 values), outfall 001 form A yearly
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 6 of 41 reports late

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 20 mg/Lall year001
Solids, total suspendedmonthly average≤ 15 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, total [as N]annual averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]annual totalreport only (lb/yr)all year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 10.4 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LJan, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr–Sep001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ .5 mg/Lall year001
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year001
Cyanide, free [amenable to chlorination]monthly averagereport only (ug/L)all year001
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Silver total recoverabledaily maximumreport only (ug/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Aluminum, total recoverabledaily maximum≤ 775.6 ug/Lall year001
Aluminum, total recoverablemonthly average≤ 360 ug/Lall year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
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
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearINF
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearINF
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearINF
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearINF
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearINF
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearINF
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all yearSM2
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all yearSM2

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0099163 · MCP: https://passage-data.com/mcp