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Airports, Flying Fields, & Services, Seattle, Washington. NPDES permit WA0024651 expired Aug 31, 2026; its terms still apply. Last 12 months: over a limit 2 times (last June 2026), 124 required values missing, 1 of 263 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| December 2025 | MTBD | Flow, average | 27884 | ≤ 18000 gal/d | 55% |
| June 2026 | SDS4 | Zinc, total [as Zn], daily maximum | 137 | ≤ 71.4 ug/L | 92% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 2665 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 1480 lb/d | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 2665 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | average | ≤ 21 mg/L | all year | 001 |
| Oil and grease, hexane extr method | average | ≤ 8 mg/L | all year | 001 |
| Propylene glycol, total | daily maximum | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Nov, Dec | 001 |
| pH, maximum | daily maximum | ≤ 9 SU | all year | 001 |
| pH, minimum | daily minimum | ≥ 6 SU | all year | 001 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | 001 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | 0D00 |
| pH | daily minimum | ≥ 6.5 SU | all year | 0D00 |
| pH | daily maximum | ≤ 8.5 SU | all year | 0D00 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | 0D00 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | 0D00 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | 0D00 |
| Turbidity, % increas over intake | daily maximum | ≤ 10 % | all year | 0D00 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 0D00 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | 0D5 |
| pH | daily minimum | ≥ 6.5 SU | all year | 0D5 |
| pH | daily maximum | ≤ 8.5 SU | all year | 0D5 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | 0D5 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | 0D5 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | 0D5 |
| Turbidity, % increas over intake | daily maximum | ≤ 10 % | all year | 0D5 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 0D5 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BG00 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BG01 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BG02 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BG03 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BG10 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BG13 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BG29 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | BGD5 |
| Oil & Grease | daily maximum | ≤ 100 mg/L | all year | BWBD |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | D10 |
| pH | daily minimum | ≥ 6.5 SU | all year | D10 |
| pH | daily maximum | ≤ 8.5 SU | all year | D10 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | D10 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | D10 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | D10 |
| Turbidity, % increas over intake | daily maximum | ≤ 10 % | all year | D10 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | D10 |
| Turbidity | daily maximum | ≤ 5 NTU | all year | D10C |
| pH | daily minimum | ≥ 6.5 SU | all year | D10C |
| pH | daily maximum | ≤ 8.5 SU | all year | D10C |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | D10C |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | D10C |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | D10C |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | D13 |
| pH | daily minimum | ≥ 6.5 SU | all year | D13 |
| pH | daily maximum | ≤ 8.5 SU | all year | D13 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | D13 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | D13 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | D13 |
| Turbidity, % increas over intake | daily maximum | ≤ 10 % | all year | D13 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | D13 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | L29 |
| pH | daily minimum | ≥ 6.5 SU | all year | L29 |
| pH | daily maximum | ≤ 8.5 SU | all year | L29 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | L29 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | L29 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | L29 |
| Turbidity, % increas over intake | daily maximum | ≤ 10 % | all year | L29 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | L29 |
| Turbidity | daily maximum | ≤ 5 NTU | all year | L29C |
| pH | daily minimum | ≥ 6.5 SU | all year | L29C |
| pH | daily maximum | ≤ 8.5 SU | all year | L29C |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | L29C |
| pH, maximum | daily maximum | ≤ 9 SU (alert, not enforceable) | all year | L29C |
| Solids, total dissolved | daily maximum | ≤ 500 mg/L (alert, not enforceable) | all year | L29C |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | L29C |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | L29C |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | M100 |
| pH | daily minimum | ≥ 6.5 SU | all year | M100 |
| pH | daily maximum | ≤ 8.5 SU | all year | M100 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | M100 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | M100 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | M100 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | M100 |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | M200 |
| pH | daily minimum | ≥ 6.5 SU | all year | M200 |
| pH | daily maximum | ≤ 8.5 SU | all year | M200 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | M200 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | M200 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | M200 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | M200 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | S234 |
| pH | daily minimum | ≥ 6.5 SU | all year | S234 |
| pH | daily maximum | ≤ 8.5 SU | all year | S234 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | S234 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | S234 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | S234 |
| Copper, total [as Cu] | daily maximum | ≤ 28.5 ug/L | all year | S234 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | S234 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | S234 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | S234 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SD35 |
| pH | daily minimum | ≥ 6.5 SU | all year | SD35 |
| pH | daily maximum | ≤ 8.5 SU | all year | SD35 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SD35 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SD35 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SD35 |
| Copper, total [as Cu] | daily maximum | ≤ 32.2 ug/L | all year | SD35 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SD35 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SD35 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SD35 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SD3A |
| pH | daily minimum | ≥ 6.3 SU | all year | SD3A |
| pH | daily maximum | ≤ 9 SU | all year | SD3A |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SD3A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SD3A |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SD3A |
| Copper, total [as Cu] | daily maximum | ≤ 59.2 ug/L | all year | SD3A |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SD3A |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SD3A |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SD3A |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SD67 |
| pH | daily minimum | ≥ 6.5 SU | all year | SD67 |
| pH | daily maximum | ≤ 8.5 SU | all year | SD67 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SD67 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SD67 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SD67 |
| Copper, total [as Cu] | daily maximum | ≤ 32.2 ug/L | all year | SD67 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SD67 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SD67 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SD67 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SDD6 |
| pH | daily minimum | ≥ 6.5 SU | all year | SDD6 |
| pH | daily maximum | ≤ 8.5 SU | all year | SDD6 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SDD6 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SDD6 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SDD6 |
| Copper, total [as Cu] | daily maximum | ≤ 25.6 ug/L | all year | SDD6 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SDD6 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SDD6 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SDD6 |
| Turbidity | average | report only (NTU) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Turbidity | daily maximum | ≤ 25 NTU | Jul–Sep | SDE4 |
| pH | daily minimum | ≥ 6.5 SU | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| pH | daily minimum | ≥ 6.5 SU | Jul–Sep | SDE4 |
| pH | daily maximum | ≤ 8.5 SU | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| pH | daily maximum | ≤ 8.5 SU | Jul–Sep | SDE4 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | Jul–Sep | SDE4 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | Jul–Sep | SDE4 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | Jul–Sep | SDE4 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Copper, total [as Cu] | daily maximum | ≤ 25.6 ug/L | Jul–Sep | SDE4 |
| Copper, total [as Cu] | daily maximum | ≤ 25.6 ug/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | Jul–Sep | SDE4 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | Jul–Sep | SDE4 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | Jul–Sep | SDE4 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | SDE4 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SDN1 |
| pH | daily minimum | ≥ 6.5 SU | all year | SDN1 |
| pH | daily maximum | ≤ 8.5 SU | all year | SDN1 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SDN1 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SDN1 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SDN1 |
| Copper, total [as Cu] | daily maximum | ≤ 28.5 ug/L | all year | SDN1 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SDN1 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SDN1 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SDN1 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SDS4 |
| pH | daily minimum | ≥ 6.5 SU | all year | SDS4 |
| pH | daily maximum | ≤ 8.5 SU | all year | SDS4 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SDS4 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SDS4 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SDS4 |
| Copper, total [as Cu] | daily maximum | ≤ 32.2 ug/L | all year | SDS4 |
| Zinc, total [as Zn] | daily maximum | ≤ 71.4 ug/L | all year | SDS4 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SDS4 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SDS4 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SDW2 |
| pH | daily minimum | ≥ 6.3 SU | all year | SDW2 |
| pH | daily maximum | ≤ 9 SU | all year | SDW2 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SDW2 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SDW2 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SDW2 |
| Copper, total [as Cu] | daily maximum | ≤ 47.9 ug/L | all year | SDW2 |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SDW2 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SDW2 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SDW2 |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SW1A |
| pH | daily minimum | ≥ 6.3 SU | all year | SW1A |
| pH | daily maximum | ≤ 9 SU | all year | SW1A |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SW1A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SW1A |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SW1A |
| Copper, total [as Cu] | daily maximum | ≤ 59.2 ug/L | all year | SW1A |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SW1A |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SW1A |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SW1A |
| Turbidity | daily maximum | ≤ 25 NTU | all year | SW1B |
| pH | daily minimum | ≥ 6.3 SU | all year | SW1B |
| pH | daily maximum | ≤ 9 SU | all year | SW1B |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | SW1B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | all year | SW1B |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .68 mg/L | all year | SW1B |
| Copper, total [as Cu] | daily maximum | ≤ 59.2 ug/L | all year | SW1B |
| Zinc, total [as Zn] | daily maximum | ≤ 117 ug/L | all year | SW1B |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | SW1B |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | SW1B |
| Turbidity | daily maximum | report only (NTU) (alert, not enforceable) | all year | W200 |
| pH | daily minimum | ≥ 6.5 SU | all year | W200 |
| pH | daily maximum | ≤ 8.5 SU | all year | W200 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5 mg/L | all year | W200 |
| Turbidity, increase over background | daily maximum | ≤ 5 NTU | all year | W200 |
| Flow | daily maximum | report only (MGD) (alert, not enforceable) | all year | W200 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | W200 |
Cited limits by parameter: Washington's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/WA0024651 · MCP: https://passage-data.com/mcp