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Terry Thies

Sewerage Systems, Monroe City, Missouri. NPDES permit MO0139467 expired Aug 31, 2025; its limits still apply. Last 12 months: over a limit 11 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form M monthly (12 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 26 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
October 2025	BOD, 5-day, 20 deg. C, monthly average	13.1	≤ 10 mg/L	31%
October 2025	Nitrogen, ammonia total [as N], daily maximum	18.2	≤ 5.6 mg/L	225%
October 2025	Nitrogen, ammonia total [as N], monthly average	18.2	≤ 2.1 mg/L	767%
April 2026	Nitrogen, ammonia total [as N], daily maximum	37.3	≤ 1.7 mg/L	2094%
April 2026	Nitrogen, ammonia total [as N], monthly average	37.3	≤ .6 mg/L	6117%
May 2026	BOD, 5-day, 20 deg. C, monthly average	10.5	≤ 10 mg/L	5%
July 2026	BOD, 5-day, 20 deg. C, monthly average	15.41	≤ 10 mg/L	54%
July 2026	BOD, 5-day, 20 deg. C, weekly average	15.41	≤ 15 mg/L	3%
July 2026	Nitrogen, ammonia total [as N], daily maximum	13.3	≤ 1.7 mg/L	682%
July 2026	Nitrogen, ammonia total [as N], monthly average	13.3	≤ .6 mg/L	2117%
August 2026	Solids, total suspended, monthly average	10.9	≤ 10 mg/L	9%

Limits in force (14)

Parameter	Statistic	Limit	Months
BOD, 5-day, 20 deg. C	weekly average	≤ 15 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 10 mg/L	all year
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	weekly average	≤ 15 mg/L	all year
Solids, total suspended	monthly average	≤ 10 mg/L	all year
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.6 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]	daily maximum	≤ 1.7 mg/L	Apr–Sep
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Jan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]	monthly average	≤ .6 mg/L	Apr–Sep
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	≤ 630 #/100mL	Apr–Oct
E. coli	30-day geometric mean	≤ 126 #/100mL	Apr–Oct

How strict are these limits?

Nitrogen, ammonia total [as N], monthly average .6 mg/L — stricter than 98% of 753 other minor industrial and other permits in Missouri; 2% have the same limit
Nitrogen, ammonia total [as N], daily maximum 1.7 mg/L — stricter than 97% of 758 other minor industrial and other permits in Missouri; 1% have the same limit
Solids, total suspended, weekly average 15 mg/L — stricter than 97% of 786 other minor industrial and other permits in Missouri; 3% have the same limit

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/MO0139467 · MCP: https://passage-data.com/mcp