City of Des Moines — NPDES permit IA0075931: limits, due date and EPA's record

Airports, Flying Fields, & Services, Des Moines, Iowa. NPDES permit IA0075931, in force until Apr 30, 2027. Last 12 months: over a limit 2 times (last April 2026), 3 of 3 reports late. Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
April 2026	BOD, carbonaceous [5 day, 20 C], 30-day average	265	≤ 100 mg/L	165%
April 2026	BOD, carbonaceous [5 day, 20 C], daily maximum	378	≤ 150 mg/L	152%

Limits in force (55)

Parameter	Statistic	Limit	Months	Outfall
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	all year	001
pH	daily minimum	≥ 6.5 SU	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Oil & Grease	30-day average	≤ 10 mg/L	all year	001
Oil & Grease	daily maximum	≤ 15 mg/L	all year	001
Propylene glycol, total	30-day average	≤ 98 mg/L	all year	001
Propylene glycol, total	daily maximum	≤ 150 mg/L	all year	001
Ethylene glycol	30-day average	≤ 125 mg/L	all year	001
Ethylene glycol	daily maximum	≤ 185 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	Apr	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 95 mg/L	Jun	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	Oct	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	Mar	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 72 mg/L	Jul	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 95 mg/L	Aug	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	Dec	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	Jan	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	May	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	Nov	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	Feb	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 80 mg/L	Sep	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	Apr	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 95 mg/L	Jun	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	Oct	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	Mar	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 72 mg/L	Jul	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 95 mg/L	Aug	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	Dec	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	Jan	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 140 mg/L	May	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	Nov	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	Feb	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 80 mg/L	Sep	001
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	all year	002
pH	daily minimum	≥ 6.5 SU	all year	002
pH	daily maximum	≤ 9 SU	all year	002
Oil & Grease	30-day average	≤ 10 mg/L	all year	002
Oil & Grease	daily maximum	≤ 15 mg/L	all year	002
Propylene glycol, total	30-day average	≤ 98 mg/L	all year	002
Propylene glycol, total	daily maximum	≤ 355 mg/L	all year	002
Ethylene glycol	30-day average	≤ 185 mg/L	all year	002
Ethylene glycol	daily maximum	≤ 185 mg/L	all year	002
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	all year	002
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	all year	002
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	all year	003
pH	daily minimum	≥ 6.5 SU	all year	003
pH	daily maximum	≤ 9 SU	all year	003
Oil & Grease	30-day average	≤ 10 mg/L	all year	003
Oil & Grease	daily maximum	≤ 15 mg/L	all year	003
Propylene glycol, total	30-day average	≤ 98 mg/L	all year	003
Propylene glycol, total	daily maximum	≤ 355 mg/L	all year	003
Ethylene glycol	30-day average	≤ 185 mg/L	all year	003
Ethylene glycol	daily maximum	≤ 185 mg/L	all year	003
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 100 mg/L	all year	003
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 150 mg/L	all year	003

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IA0075931 · MCP: https://passage-data.com/mcp