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City of Martelle

Sewage treatment plant, Martelle, Iowa. NPDES permit IA0062987, in force until Apr 30, 2028. Last 12 months: over a limit 4 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (6 values)
Renewal application due: Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file: August 2026
Oct 2024 – Sep 2025: 2 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
November 2025	Solids, total suspended, 30-day average	84.5	≤ 80 mg/L	6%
November 2025	pH, daily maximum	9.05	≤ 9 SU	—
April 2026	pH, daily maximum	9.2	≤ 9 SU	—
May 2026	pH, daily maximum	9.2	≤ 9 SU	—

Limits in force (6)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 9 SU	all year
Solids, total suspended	30-day average	≤ 80 mg/L	all year
Solids, total suspended	7-day average	≤ 120 mg/L	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

How strict are these limits?

pH, daily minimum at least 6.5 SU — stricter than 56% of 699 other minor POTWs in Iowa; 44% have the same limit

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0062987 · MCP: https://passage-data.com/mcp