Columbia Helicopters, Inc. — NPDES permit OR0033391: limits, due date and EPA's record

Air Transportation, Nonscheduled, Aurora, Oregon. NPDES permit OR0033391 expired Jun 30, 2015; its limits still apply. Last 12 months: no values over a limit, 3 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Limits in force (20)

Parameter	Statistic	Limit	Months	Outfall
pH	daily minimum	≥ 6.2 SU	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Solids, total suspended	value	≤ 130 mg/L (alert, not enforceable)	all year	001
Oil & Grease	value	≤ 10 mg/L	all year	001
Copper, total [as Cu]	value	≤ .1 mg/L (alert, not enforceable)	all year	001
Lead, total [as Pb]	value	≤ .4 mg/L (alert, not enforceable)	all year	001
Zinc, total [as Zn]	value	≤ .6 mg/L (alert, not enforceable)	all year	001
Floating solids, waste or visible foam-visual	value	≤ 0 N=0;Y=1 (alert, not enforceable)	all year	001
Oil and grease visual	value	report only (N=0;Y=1) (alert, not enforceable)	all year	001
pH	daily minimum	report only (SU)	all year	002
pH	daily maximum	report only (SU)	all year	002
1,2-Dichloroethane	value	≤ 5 ppb	all year	002
Tetrachloroethylene	value	≤ 5 ppb	all year	002
1,1-Dichloroethylene	value	≤ 7 ug/L	all year	002
1,1,1-Trichloroethane	value	≤ 200 ppb	all year	002
trans-1,2-Dichloroethylene	value	≤ 100 ppb	all year	002
Vinyl chloride	value	≤ 2 ppb	all year	002
Trichloroethylene	value	≤ 5 ppb	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
cis-1,2-Dichloroethene	value	≤ 70 ppb	all year	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/OR0033391 · MCP: https://passage-data.com/mcp