Missouri-American Water Company — NPDES permit MO0113751: limits, due date and EPA's record

Sewerage Systems, Trimble, Missouri. NPDES permit MO0113751 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 4 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
December 2025	Solids, total suspended, monthly average	114	≤ 70 mg/L	63%
December 2025	Solids, total suspended, weekly average	114	≤ 110 mg/L	4%
December 2025	pH, maximum	9.8	≤ 9 SU	—
March 2026	Nitrogen, ammonia total [as N], monthly average	5.45	≤ 2.7 mg/L	102%

Limits in force (16)

Parameter	Statistic	Limit	Months
BOD, 5-day, 20 deg. C	weekly average	≤ 65 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 45 mg/L	all year
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	weekly average	≤ 110 mg/L	all year
Solids, total suspended	monthly average	≤ 70 mg/L	all year
Oil and grease [soxhlet extr.] tot.	daily maximum	≤ 15 mg/L	all year
Oil and grease [soxhlet extr.] tot.	monthly average	≤ 10 mg/L	all year
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.7 mg/L	Apr–Sep
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.2 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]	monthly average	≤ 1.3 mg/L	Apr–Sep
Nitrogen, ammonia total [as N]	monthly average	≤ 2.7 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
E. coli	daily maximum	≤ 1030 #/100mL	Apr–Dec
E. coli	30-day geometric mean	≤ 206 #/100mL	Apr–Dec

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/MO0113751 · MCP: https://passage-data.com/mcp