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Indianapolis Executive Airport

Airports, Flying Fields, & Services, Zionsville, Indiana. NPDES permit INRM00004 expired Feb 15, 2020; its limits still apply. No reports in EPA's file for the last 12 months. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: outfall SCCE form RA yearly, outfall SCDE form RA yearly, outfall SCEE form RA yearly
Last report on file: None in EPA's file for the last 12 months; that may be EPA's gap, not the facility's

Limits in force (9)

Parameter	Statistic	Limit	Months	Outfall
Phosphorus, total [as P]	daily maximum	≤ 105 mg/L	all year	SCCE
Fluoride, total [as F]	daily maximum	≤ 75 mg/L	all year	SCCE
pH	daily minimum	≥ 6 SU	all year	SCDE
pH	daily maximum	≤ 9 SU	all year	SCDE
Solids, total suspended	daily maximum	≤ 23 mg/L	all year	SCDE
Oil & Grease	daily maximum	≤ 15 mg/L	all year	SCDE
pH	daily minimum	≥ 6 SU	Mar, Jun, Sep, Dec	SCEE
pH	daily maximum	≤ 9 SU	Mar, Jun, Sep, Dec	SCEE
Solids, total suspended	daily maximum	≤ 50 mg/L	all year	SCEE

How strict are these limits?

Solids, total suspended, daily maximum 23 mg/L — stricter than 95% of 259 other minor industrial and other permits in Indiana
Oil & Grease, daily maximum 15 mg/L — stricter than 13% of 2,554 other minor industrial and other permits nationwide; 78% have the same limit

Cited limits by parameter: Indiana'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/INRM00004 · MCP: https://passage-data.com/mcp