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City of Schaller

Sewage treatment plant, Schaller, Iowa. NPDES permit IA0042935, in force until Feb 28, 2027. Last 12 months: over a limit 3 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (14 values)
Renewal application due: Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file: September 2026
Oct 2024 – Sep 2025: 5 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
June 2026	BOD, carbonaceous [5 day, 20 C], 30-day average	25.6	≤ 25 mg/L	2%
June 2026	BOD, carbonaceous [5 day, 20 C], 7-day average	40.5	≤ 40 mg/L	1%
June 2026	Chloride [as Cl], 30-day average	458.5	≤ 391 mg/L	17%

Limits in force (14)

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
Chloride [as Cl]	30-day average	≤ 391 mg/L	all year
Chloride [as Cl]	daily maximum	≤ 629 mg/L	all year
Chloride [as Cl]	30-day average	≤ 2999 lb/d	all year
Chloride [as Cl]	daily maximum	≤ 4827 lb/d	all year
Sulfate, total [as SO4]	30-day average	≤ 1514 mg/L	all year
Sulfate, total [as SO4]	daily maximum	≤ 1514 mg/L	all year
Sulfate, total [as SO4]	30-day average	≤ 11620 lb/d	all year
Sulfate, total [as SO4]	daily maximum	≤ 11620 lb/d	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
Chloride [as Cl], 30-day average 391 mg/L — stricter than 49% of 69 other minor POTWs in Iowa; 6% have the same limit
Chloride [as Cl], daily maximum 629 mg/L — stricter than 47% of 69 other minor POTWs in Iowa; 52% 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/IA0042935 · MCP: https://passage-data.com/mcp