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City of Maryville

Sewage treatment plant, major discharger, Maryville, Missouri. NPDES permit MO0033286 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 3 times (last January 2026), 1 required value missing, 3 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (14 values), outfall 001 form B quarterly (16 values), outfall SM1 form A quarterly (4 values), outfall SM2 form A quarterly (2 values), outfall 001 form WA yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 25 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], daily maximum17.4≤ 12.4 mg/L40%
January 2026Nitrogen, ammonia total [as N], monthly average17.4≤ 2.6 mg/L569%
January 2026Solids, total suspended, weekly average53≤ 45 mg/L18%

Limits in force (40)

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 maximum≤ 15 mg/Lall year001
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Apr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 12.4 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Apr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Cyanide, free [amenable to chlorination]daily maximum≤ 9.5 ug/Lall year001
Cyanide, free [amenable to chlorination]monthly average≤ 4.8 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 183.6 ug/Lall year001
Zinc, total recoverablemonthly average≤ 91.5 ug/Lall year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverabledaily maximum≤ 11.2 ug/Lall year001
Lead, total recoverablemonthly average≤ 5.6 ug/Lall year001
Copper, total recoverabledaily maximum≤ 22.4 ug/Lall year001
Copper, total recoverablemonthly average≤ 11.2 ug/Lall 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≤ 1030 #/100mLApr–Oct001
E. coli30-day geometric mean≤ 206 #/100mLApr–Oct001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (toxic)all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearSM1
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearSM1
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearSM1
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/MO0033286 · MCP: https://passage-data.com/mcp