City of East Lynne — NPDES permit MO0099961: limits, due date and EPA's record

Sewage treatment plant, East Lynne, Missouri. NPDES permit MO0099961 expired Jun 30, 2026; its limits still apply. Last 12 months: over a limit 11 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
February 2026	Nitrogen, ammonia total [as N], daily maximum	10.9	≤ 10.1 mg/L	8%
February 2026	Nitrogen, ammonia total [as N], monthly average	10.9	≤ 2.7 mg/L	304%
March 2026	Nitrogen, ammonia total [as N], monthly average	4.41	≤ 2.7 mg/L	63%
April 2026	BOD, 5-day, 20 deg. C, monthly average	55	≤ 45 mg/L	22%
April 2026	E. coli, 30-day geometric mean	435.2	≤ 206 #/100mL	111%
April 2026	Nitrogen, ammonia total [as N], monthly average	2.73	≤ 2.3 mg/L	19%
June 2026	E. coli, 30-day geometric mean	214.8	≤ 206 #/100mL	4%
June 2026	Solids, suspended percent removal, monthly average minimum	27	≥ 65 %	109%
August 2026	Solids, suspended percent removal, monthly average minimum	< 65	≥ 65 %	—
August 2026	Solids, total suspended, monthly average	100	≤ 80 mg/L	25%
August 2026	pH, maximum	9.2	≤ 9 SU	—

Limits in force (38)

Parameter	Statistic	Limit	Months	Outfall
BOD, 5-day, 20 deg. C	weekly average	≤ 65 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 45 mg/L	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	weekly average	≤ 120 mg/L	all year	001
Solids, total suspended	monthly average	≤ 80 mg/L	all year	001
Oil and grease [soxhlet extr.] tot.	daily maximum	≤ 15 mg/L	all year	001
Oil and grease [soxhlet extr.] tot.	monthly average	≤ 10 mg/L	all year	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 12.1 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.1 mg/L	Feb, Mar, Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 12.1 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 12.1 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.1 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 12.1 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 12.1 mg/L	Jan, Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.1 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 12.1 mg/L	Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.9 mg/L	May	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.7 mg/L	Feb, Mar, Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.6 mg/L	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.7 mg/L	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.3 mg/L	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.5 mg/L	Jun	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.1 mg/L	Jan, Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.1 mg/L	Jul	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.3 mg/L	Aug	001
Hardness, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Hardness, total [as CaCO3]	monthly average	report only (mg/L)	all year	001
Copper, total recoverable	daily maximum	≤ 29.5 ug/L	all year	001
Copper, total recoverable	monthly average	≤ 11.8 ug/L	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
E. coli	7-day geometric mean	≤ 1030 #/100mL	Apr–Oct	001
E. coli	30-day geometric mean	≤ 206 #/100mL	Apr–Oct	001
BOD, 5-day, percent removal	monthly average minimum	≥ 65 %	all year	001
Solids, suspended percent removal	monthly average minimum	≥ 65 %	all year	001
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	INF
Solids, total suspended	monthly average	report only (mg/L)	all year	INF

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/MO0099961 · MCP: https://passage-data.com/mcp