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Tri-County Community School

Elementary And Secondary Schools, Thornburg, Iowa. NPDES permit IA0068390 expired Oct 31, 2002; its limits still apply. Last 12 months: over a limit 10 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (8 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 4 required values missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
November 2025	Flow, in conduit or thru treatment plant, 30-day average	.018	≤ .0068 MGD	165%
November 2025	Flow, in conduit or thru treatment plant, daily maximum	.018	≤ .0089 MGD	102%
December 2025	Flow, in conduit or thru treatment plant, 30-day average	.014	≤ .0068 MGD	106%
December 2025	Flow, in conduit or thru treatment plant, daily maximum	.014	≤ .0089 MGD	57%
January 2026	Flow, in conduit or thru treatment plant, 30-day average	.017	≤ .0068 MGD	150%
January 2026	Flow, in conduit or thru treatment plant, daily maximum	.017	≤ .0089 MGD	91%
February 2026	Flow, in conduit or thru treatment plant, 30-day average	.016	≤ .0068 MGD	135%
February 2026	Flow, in conduit or thru treatment plant, daily maximum	.016	≤ .0089 MGD	80%
March 2026	Flow, in conduit or thru treatment plant, 30-day average	.014	≤ .0068 MGD	106%
March 2026	Flow, in conduit or thru treatment plant, daily maximum	.014	≤ .0089 MGD	57%

Limits in force (12)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6 SU	all year
pH	daily maximum	≤ 9 SU	all year
Solids, total suspended	30-day average	≤ 30 mg/L	all year
Solids, total suspended	7-day average	≤ 45 mg/L	all year
Solids, total suspended	30-day average	≤ 1.7 lb/d	all year
Solids, total suspended	7-day average	≤ 2.5 lb/d	all year
Flow, in conduit or thru treatment plant	30-day average	≤ .0068 MGD	all year
Flow, in conduit or thru treatment plant	daily maximum	≤ .0089 MGD	all year
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 25 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	7-day average	≤ 40 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 1.4 lb/d	all year
BOD, carbonaceous [5 day, 20 C]	7-day average	≤ 2.2 lb/d	all year

How strict are these limits?

Flow, in conduit or thru treatment plant, daily maximum .0089 MGD — stricter than 63% of 38 other minor industrial and other permits nationwide
Solids, total suspended, 7-day average 45 mg/L — stricter than 60% of 180 other minor industrial and other permits in Iowa; 39% have the same limit
Solids, total suspended, 30-day average 30 mg/L — stricter than 40% of 289 other minor industrial and other permits in Iowa; 56% have the same limit

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

Same industry: the 30 Educational Services permits in Iowa.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0068390 · MCP: https://passage-data.com/mcp