Durango La Plata County Airport

NPDES permit CO0047457 · Minor NON-POTW · administratively continued, expires 2023-10-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2023-10-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 30 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (200)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 75 mg/L all year
001Solids, total suspendedMX 7D AV <= 110 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 64 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 43 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 32 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 64 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 64 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 64 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 64 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 42 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 56 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 43 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 42 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 64 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 31 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 31 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 11 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 13 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 13 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 12 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 13 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 13 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 25 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 52 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 32 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 180 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 54 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 49 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 105 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 340 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 260 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 210 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 48 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 55 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 44 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 72 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 54 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 49 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 21 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 25 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 26 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 26 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 29 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 30 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 33 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 32 mg/L Dec
001Nitrogen, ammonia total [as N]ROLL AVG report only Jan
001Nitrogen, ammonia total [as N]ROLL AVG report only Feb
001Nitrogen, ammonia total [as N]ROLL AVG report only Mar
001Nitrogen, ammonia total [as N]ROLL AVG report only Apr
001Nitrogen, ammonia total [as N]ROLL AVG report only May
001Nitrogen, ammonia total [as N]ROLL AVG report only Jun
001Nitrogen, ammonia total [as N]ROLL AVG report only Jul
001Nitrogen, ammonia total [as N]ROLL AVG report only Aug
001Nitrogen, ammonia total [as N]ROLL AVG report only Sep
001Nitrogen, ammonia total [as N]ROLL AVG report only Oct
001Nitrogen, ammonia total [as N]ROLL AVG report only Nov
001Nitrogen, ammonia total [as N]ROLL AVG report only Dec
001Nitrogen, inorganic totalDAILY MX <= 138 mg/L all year
001Nitrogen, inorganic totalROLL AVG report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Iron, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG <= 12667 ug/L all year
001Iron, total recoverable30DA AVG report only all year
001Iron, total recoverableROLL AVG report only all year
001Iron, total recoverableROLL AVG <= 1956 ug/L all year
001Iron, dissolved [as Fe]30DA AVG report only all year
001Iron, dissolved [as Fe]30DA AVG <= 3864 ug/L all year
001Aluminum, total recoverable30DA AVG report only all year
001Aluminum, total recoverableDAILY MX report only all year
001Lead, total recoverable30DA AVG report only all year
001Lead, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvdDAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Benzene30DA AVG report only all year
001Benzene30DA AVG <= 30 ug/L all year
001BenzeneDAILY MX report only all year
001BenzeneDAILY MX <= 73249 ug/L all year
001BenzeneROLL AVG report only all year
001BenzeneROLL AVG <= 4.6 ug/L all year
001Anthracene30DA AVG report only all year
001Anthracene30DA AVG <= 29023 ug/L all year
001AnthraceneROLL AVG report only all year
001AnthraceneROLL AVG <= 4353 ug/L all year
001Benzo[b]fluoranthene30DA AVG report only all year
001Benzo[b]fluoranthene30DA AVG <= .053 ug/L all year
001Benzo[b]fluoranthene30DA AVG report only all year
001Benzo[b]fluorantheneROLL AVG report only all year
001Benzo[b]fluorantheneROLL AVG <= .0083 ug/L all year
001Benzo[k]fluoranthene30DA AVG report only all year
001Benzo[k]fluoranthene30DA AVG <= .053 ug/L all year
001Benzo[k]fluoranthene30DA AVG report only all year
001Benzo[k]fluorantheneROLL AVG report only all year
001Benzo[k]fluorantheneROLL AVG <= .0083 ug/L all year
001Benzo[a]pyrene30DA AVG report only all year
001Benzo[a]pyrene30DA AVG <= .053 ug/L all year
001Benzo[a]pyrene30DA AVG report only all year
001Benzo[a]pyreneROLL AVG report only all year
001Benzo[a]pyreneROLL AVG <= .0083 ug/L all year
001Chrysene30DA AVG report only all year
001Chrysene30DA AVG <= .053 ug/L all year
001Chrysene30DA AVG report only all year
001ChryseneROLL AVG report only all year
001ChryseneROLL AVG <= .0083 ug/L all year
001Fluoranthene30DA AVG report only all year
001Fluoranthene30DA AVG <= 1797 ug/L all year
001FluorantheneDAILY MX report only all year
001FluorantheneDAILY MX <= 55006 ug/L all year
001FluorantheneROLL AVG report only all year
001FluorantheneROLL AVG <= 276 ug/L all year
001Fluorene30DA AVG report only all year
001Fluorene30DA AVG <= 3870 ug/L all year
001Fluorene30DA AVG report only all year
001FluoreneROLL AVG report only all year
001FluoreneROLL AVG <= 580 ug/L all year
001Indeno[1,2,3-cd]pyrene30DA AVG report only all year
001Indeno[1,2,3-cd]pyrene30DA AVG <= .053 ug/L all year
001Indeno[1,2,3-cd]pyrene30DA AVG report only all year
001Indeno[1,2,3-cd]pyreneROLL AVG report only all year
001Indeno[1,2,3-cd]pyreneROLL AVG <= .0083 ug/L all year
001Pyrene30DA AVG report only all year
001Pyrene30DA AVG <= 2902 ug/L all year
001Pyrene30DA AVG report only all year
001PyreneROLL AVG report only all year
001PyreneROLL AVG <= 442 ug/L all year
001Benzo[ghi]perylene30DA AVG report only all year
001Benzo[ghi]perylene30DA AVG <= .053 ug/L all year
001Benzo[ghi]perylene30DA AVG report only all year
001Benzo[ghi]peryleneROLL AVG report only all year
001Benzo[ghi]peryleneROLL AVG <= .0083 ug/L all year
001Benzo[a]anthracene30DA AVG report only all year
001Benzo[a]anthracene30DA AVG <= .053 ug/L all year
001Benzo[a]anthracene30DA AVG report only all year
001Benzo[a]anthraceneROLL AVG report only all year
001Benzo[a]anthraceneROLL AVG <= .0083 ug/L all year
001Dibenz[a,h]anthracene30DA AVG report only all year
001Dibenz[a,h]anthracene30DA AVG <= .053 ug/L all year
001Dibenz[a,h]anthracene30DA AVG report only all year
001Dibenz[a,h]anthraceneROLL AVG report only all year
001Dibenz[a,h]anthraceneROLL AVG <= .0083 ug/L all year
001Naphthalene30DA AVG report only all year
001Naphthalene30DA AVG <= 1935 ug/L all year
001Naphthalene30DA AVG report only all year
001NaphthaleneDAILY MX report only all year
001NaphthaleneDAILY MX <= 31787 ug/L all year
001NaphthaleneDAILY MX report only all year
001NaphthaleneROLL AVG report only all year
001NaphthaleneROLL AVG <= 290 ug/L all year
001BTEXDAILY MX report only all year
001BTEXDAILY MX <= 100 ug/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= .025 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residual30DA AVG <= .29 mg/L all year
001Chlorine, total residual30DA AVG report only all year
001Chlorine, total residualINST MAX <= .26 mg/L all year
001Chlorine, total residualINST MAX <= .26 mg/L all year
001Chlorine, total residualROLL AVG report only all year
001Chlorine, total residualROLL AVG <= .023 mg/L all year
001E. coli30DA GM report only all year
001E. coliMX 7D GM <= 2700 #/100mL all year
001E. coliROLL AVG <= 223 #/100mL all year
001Nonylphenol30DA AVG <= 91 ug/L all year
001Nonylphenol30DA AVG report only all year
001Nonylphenol30DA AVG report only all year
001NonylphenolDAILY MX <= 387 ug/L all year
001NonylphenolDAILY MX report only all year
001NonylphenolDAILY MX <= 387 ug/L all year
001NonylphenolROLL AVG report only all year
001NonylphenolROLL AVG <= 14 ug/L all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]30DA AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MX 7D AV <= 40 mg/L all year
001BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
001Sulfate30DA AVG report only all year
001SulfateDAILY MX report only all year
001Oil and grease visualINST MAX report only all year
001LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaMN VALUE report only all year
001LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaMN VALUE >= 100 % all year
001LC50 Static Renewal 96Hr Acute Pimephales promelasMN VALUE report only all year
001LC50 Static Renewal 96Hr Acute Pimephales promelasMN VALUE >= 100 % all year
300Plant capacity fact. percent of capacity30DA AVG report only all year
300Plant capacity fact. percent of capacity30DA AVG report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300Solids, total suspended30DA AVG report only all year
300Solids, total suspendedMX 7D AV report only all year
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plantDAILY MX report only all year
300BOD, carbonaceous [5 day, 20 C]30DA AVG report only all year
300BOD, carbonaceous [5 day, 20 C]MX 7D AV report only all year

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