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City of Weldon

Sewage treatment plant, Weldon, Iowa. NPDES permit IA0069167 expired May 31, 2022; its limits still apply. Last 12 months: over a limit 7 times (last May 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (6 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 11 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	pH, daily maximum	9.03	≤ 9 SU	—
December 2025	BOD, carbonaceous [5 day, 20 C], 30-day average	42	≤ 25 mg/L	68%
December 2025	BOD, carbonaceous [5 day, 20 C], 7-day average	42	≤ 40 mg/L	5%
December 2025	Solids, total suspended, 30-day average	171	≤ 80 mg/L	114%
December 2025	Solids, total suspended, 7-day average	171	≤ 120 mg/L	43%
May 2026	BOD, carbonaceous [5 day, 20 C], 30-day average	38.5	≤ 25 mg/L	54%
May 2026	BOD, carbonaceous [5 day, 20 C], 7-day average	42	≤ 40 mg/L	5%

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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0069167 · MCP: https://passage-data.com/mcp