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City of Danbury

Sewage treatment plant, Danbury, Iowa. NPDES permit IA0035246, in force until Jun 30, 2028. Last 12 months: over a limit 6 times (last August 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (11 values)
Renewal application due: Jan 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 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	9.1	≤ 9 SU	—
May 2026	Chloride [as Cl], 30-day average	1811	≤ 1500 mg/L	21%
June 2026	BOD, carbonaceous [5 day, 20 C], 30-day average	40.8	≤ 25 mg/L	63%
June 2026	BOD, carbonaceous [5 day, 20 C], 7-day average	40.8	≤ 40 mg/L	2%
June 2026	Chloride [as Cl], 30-day average	1608	≤ 1500 mg/L	7%
August 2026	Chloride [as Cl], 30-day average	1566	≤ 1500 mg/L	4%

Limits in force (11)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6 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	≤ 1500 mg/L	all year
Chloride [as Cl]	daily maximum	≤ 2308 mg/L	all year
Chloride [as Cl]	30-day average	≤ 12760 lb/d	all year
Chloride [as Cl]	daily maximum	≤ 19633 lb/d	all year
E. coli	geometric mean	≤ 126 #/100mL	Mar–Nov
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

New limits from Jun 1, 2028

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
Chloride [as Cl], 30-day average	749 mg/L	tighter	1139 mg/L (12 values)	1.52×
Chloride [as Cl], daily maximum	749 mg/L	tighter	1139 mg/L (12 values)	1.52×
Chloride [as Cl], 30-day average	6368 lb/d	tighter	196.8 lb/d (11 values)	0.0309×
Chloride [as Cl], daily maximum	6368 lb/d	tighter	196.8 lb/d (11 values)	0.0309×

How strict are these limits?

E. coli, geometric mean 126 #/100mL — stricter than 44% of 285 other minor POTWs in Iowa; 55% 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/IA0035246 · MCP: https://passage-data.com/mcp