Westminster City of

NPDES permit CO0024171 · Major POTW · administratively continued, expires 2024-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2024-12-31 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 102 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among CO permits in EPA's filings — check your permit).

Limits in force (310)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Cyanide, total [as CN]DAILY MX report only all year
001Arsenic, total [as As]DAILY MX report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Chromium, total [as Cr]DAILY MX report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Molybdenum, total [as Mo]DAILY MX report only all year
001Nickel, total [as Ni]DAILY MX report only all year
001Silver, total [as Ag]DAILY MX report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Selenium, total [as Se]DAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Total phenolsDAILY MX report only all year
001Flow, in conduit or thru treatment plant30DA AVG <= 11.9 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001E. coli30DA GM <= 2000 #/100mL all year
001E. coliMX 7D GM <= 4000 #/100mL all year
001Mercury, total [as Hg]DAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Oil and grease visualINST MAX report only all year
002Flow, in conduit or thru treatment plant30DA AVG <= 11.9 MGD all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003Temperature, water deg. centigradeMX WK AV report only all year
003Temperature, water deg. centigradeDAILY MX report only all year
003BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
003BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspended30DA AVG <= 30 mg/L all year
003Solids, total suspendedMX 7D AV <= 45 mg/L all year
003Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Apr
003Nitrogen, ammonia total [as N]30DA AVG <= 7.7 mg/L Feb
003Nitrogen, ammonia total [as N]30DA AVG <= 7.8 mg/L Jan
003Nitrogen, ammonia total [as N]30DA AVG <= 3.9 mg/L Jul
003Nitrogen, ammonia total [as N]30DA AVG <= 5.8 mg/L May
003Nitrogen, ammonia total [as N]30DA AVG <= 4.6 mg/L Jun
003Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Aug
003Nitrogen, ammonia total [as N]30DA AVG <= 7.4 mg/L Dec
003Nitrogen, ammonia total [as N]30DA AVG <= 7.1 mg/L Mar
003Nitrogen, ammonia total [as N]30DA AVG <= 4.9 mg/L Oct
003Nitrogen, ammonia total [as N]30DA AVG <= 6.1 mg/L Nov
003Nitrogen, ammonia total [as N]30DA AVG <= 4.5 mg/L Sep
003Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Apr
003Nitrogen, ammonia total [as N]DAILY MX <= 18 mg/L Feb
003Nitrogen, ammonia total [as N]DAILY MX <= 18 mg/L Jan
003Nitrogen, ammonia total [as N]DAILY MX <= 17 mg/L Jul
003Nitrogen, ammonia total [as N]DAILY MX <= 32 mg/L May
003Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Jun
003Nitrogen, ammonia total [as N]DAILY MX <= 38 mg/L Aug
003Nitrogen, ammonia total [as N]DAILY MX <= 19 mg/L Dec
003Nitrogen, ammonia total [as N]DAILY MX <= 17 mg/L Mar
003Nitrogen, ammonia total [as N]DAILY MX <= 23 mg/L Oct
003Nitrogen, ammonia total [as N]DAILY MX <= 19 mg/L Nov
003Nitrogen, ammonia total [as N]DAILY MX <= 24 mg/L Sep
003Nitrogen, inorganic totalDAILY MX <= 15 mg/L all year
003Nitrogen, inorganic totalDAILY MX <= 14 mg/L all year
003Nitrogen, inorganic totalANNL MEDN <= 15 mg/L all year
003Nitrogen, inorganic totalANNL MEDN report only all year
003Nitrogen, inorganic total95th % <= 20 mg/L all year
003Nitrogen, inorganic total95th % report only all year
003Phosphorus, total [as P]ANNL MEDN report only all year
003Phosphorus, total [as P]ANNL MEDN <= 1 mg/L all year
003Phosphorus, total [as P]95th % report only all year
003Phosphorus, total [as P]95th % <= 2.5 mg/L all year
003Cyanide, weak acid, dissociableDAILY MX <= 5 ug/L all year
003Cyanide, total [as CN]DAILY MX report only all year
003Arsenic, total recoverable30DA AVG report only all year
003Iron, total recoverable30DA AVG report only all year
003Iron, total recoverable30DA AVG <= 1013 ug/L all year
003Beryllium, total recoverable [as Be]30DA AVG report only all year
003Arsenic, total [as As]DAILY MX report only all year
003Cadmium, total [as Cd]DAILY MX report only all year
003Chromium, total [as Cr]DAILY MX report only all year
003Copper, total [as Cu]DAILY MX report only all year
003Iron, dissolved [as Fe]30DA AVG <= 865 ug/L all year
003Lead, total [as Pb]DAILY MX report only all year
003Molybdenum, total [as Mo]DAILY MX report only all year
003Nickel, total [as Ni]DAILY MX report only all year
003Silver, total [as Ag]DAILY MX report only all year
003Zinc, total [as Zn]DAILY MX report only all year
003Molybdenum, total recoverable30DA AVG report only all year
003Selenium, total [as Se]DAILY MX report only all year
003Copper, potentially dissolved30DA AVG report only all year
003Copper, potentially dissolvedDAILY MX report only all year
003Manganese, potentially dissolvd30DA AVG report only all year
003Manganese, potentially dissolvdDAILY MX report only all year
003Selenium, potentially dissolvd30DA AVG <= 7.5 ug/L Apr, May, Jun, Jul, Aug, Sep, Oct
003Selenium, potentially dissolvd30DA AVG report only Mar, Dec
003Selenium, potentially dissolvdDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
003Selenium, potentially dissolvdDAILY MX report only Mar, Dec
003Oil and greaseINST MAX <= 10 mg/L all year
003Total phenolsDAILY MX report only all year
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Chlorine, total residual30DA AVG <= .013 mg/L all year
003Chlorine, total residualINST MAX <= .02 mg/L all year
003Mercury, total [low level]30DA AVG report only all year
003E. coli30DA GM <= 205 #/100mL all year
003E. coliMX 7D GM <= 410 #/100mL all year
003Sulfide-hydrogen sulfide [undissociated]30DA AVG report only all year
003Perfluorooctanoic acid (PFOA)30DA AVG report only all year
003Perfluorooctanoic acid (PFOA)DAILY MX report only all year
003Perfluorobutanoic acid (PFBA)30DA AVG report only all year
003Perfluorobutanoic acid (PFBA)DAILY MX report only all year
003Perfluorooctanesulfonamide (PFOSA)30DA AVG report only all year
003Perfluorooctanesulfonamide (PFOSA)DAILY MX report only all year
003Nonylphenol30DA AVG report only all year
003NonylphenolDAILY MX report only all year
003Perfluoropentanoic acid (PFPeA)30DA AVG report only all year
003Perfluoropentanoic acid (PFPeA)DAILY MX report only all year
003Perfluorohexanoic acid (PFHxA)30DA AVG report only all year
003Perfluorohexanoic acid (PFHxA)DAILY MX report only all year
003Perfluoroheptanoic acid (PFHpA)30DA AVG report only all year
003Perfluoroheptanoic acid (PFHpA)DAILY MX report only all year
003Perfluorononanoic acid (PFNA)30DA AVG report only all year
003Perfluorononanoic acid (PFNA)DAILY MX report only all year
003Perfluorodecanoic acid (PFDA)30DA AVG report only all year
003Perfluorodecanoic acid (PFDA)DAILY MX report only all year
003Perfluoroundecanoic acid (PFUnA)30DA AVG report only all year
003Perfluoroundecanoic acid (PFUnA)DAILY MX report only all year
003Perfluorododecanoic acid (PFDoA)30DA AVG report only all year
003Perfluorododecanoic acid (PFDoA)DAILY MX report only all year
003Perfluorotridecanoic acid (PFTrDA)30DA AVG report only all year
003Perfluorotridecanoic acid (PFTrDA)DAILY MX report only all year
003Perfluorotetradecanoic acid (PFTeDA)30DA AVG report only all year
003Perfluorotetradecanoic acid (PFTeDA)DAILY MX report only all year
003N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)30DA AVG report only all year
003N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)DAILY MX report only all year
003N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)30DA AVG report only all year
003N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)DAILY MX report only all year
003N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)30DA AVG report only all year
003N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)DAILY MX report only all year
003N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)30DA AVG report only all year
003N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)DAILY MX report only all year
003Perfluorobutanesulfonic acid (PFBS)30DA AVG report only all year
003Perfluorobutanesulfonic acid (PFBS)DAILY MX report only all year
003Perfluorodecanesulfonic acid (PFDS)30DA AVG report only all year
003Perfluorodecanesulfonic acid (PFDS)DAILY MX report only all year
003Perfluoroheptanesulfonic acid (PFHpS)30DA AVG report only all year
003Perfluoroheptanesulfonic acid (PFHpS)DAILY MX report only all year
003Perfluorohexanesulfonic acid (PFHxS)30DA AVG report only all year
003Perfluorohexanesulfonic acid (PFHxS)DAILY MX report only all year
003Perfluorooctanesulfonic acid (PFOS)30DA AVG report only all year
003Perfluorooctanesulfonic acid (PFOS)DAILY MX report only all year
0031H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)30DA AVG report only all year
0031H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)DAILY MX report only all year
0031H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)30DA AVG report only all year
0031H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)DAILY MX report only all year
0031H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)30DA AVG report only all year
0031H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)DAILY MX report only all year
003Perfluoropentanesulfonic acid (PFPeS)30DA AVG report only all year
003Perfluoropentanesulfonic acid (PFPeS)DAILY MX report only all year
003Perfluorononanesulfonic acid (PFNS)30DA AVG report only all year
003Perfluorononanesulfonic acid (PFNS)DAILY MX report only all year
003Hexafluoropropylene oxide dimer acid (HFPO-DA)30DA AVG report only all year
003Hexafluoropropylene oxide dimer acid (HFPO-DA)DAILY MX report only all year
003Perfluoro-2-methoxypropanoic acid30DA AVG report only all year
003Perfluoro-2-methoxypropanoic acidDAILY MX report only all year
003Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)30DA AVG report only all year
003Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)DAILY MX report only all year
003Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)30DA AVG report only all year
003Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)DAILY MX report only all year
003Perfluorododecanesulfonic acid (PFDoS)30DA AVG report only all year
003Perfluorododecanesulfonic acid (PFDoS)DAILY MX report only all year
0034,8-Dioxa-3H-perfluorononanoic acid (ADONA)30DA AVG report only all year
0034,8-Dioxa-3H-perfluorononanoic acid (ADONA)DAILY MX report only all year
003Potassium 9-chlorohexadecafluoro-3-oxanonane-1-sulfonate30DA AVG report only all year
003Potassium 9-chlorohexadecafluoro-3-oxanonane-1-sulfonateDAILY MX report only all year
003Potassium 11-chloroeicosafluoro-3-oxaundecane-1-sulfonate30DA AVG report only all year
003Potassium 11-chloroeicosafluoro-3-oxaundecane-1-sulfonateDAILY MX report only all year
003N-methyl perfluorooctanesulfonamide (NMeFOSA)30DA AVG report only all year
003N-methyl perfluorooctanesulfonamide (NMeFOSA)DAILY MX report only all year
003N-ethyl perfluorooctanesulfonamide (NEtFOSA)30DA AVG report only all year
003N-ethyl perfluorooctanesulfonamide (NEtFOSA)DAILY MX report only all year
003Mercury, total [as Hg]DAILY MX report only all year
003BOD, 5-day, percent removalMO AV MN >= 85 % all year
003Solids, suspended percent removalMO AV MN >= 85 % all year
003Sulfate30DA AVG report only all year
003Sulfate30DA AVG <= 402 mg/L all year
003Styrene30DA AVG report only all year
003Boron, total30DA AVG report only all year
003Oil and grease visualINST MAX report only all year
003PFAS Sum30DA AVG report only all year
003PFAS SumDAILY MX report only all year
004Temperature, water deg. centigradeMX WK AV report only all year
004Temperature, water deg. centigradeDAILY MX report only all year
004BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
004BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
004pHMINIMUM >= 6.5 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspended30DA AVG <= 30 mg/L all year
004Solids, total suspendedMX 7D AV <= 45 mg/L all year
004Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Apr
004Nitrogen, ammonia total [as N]30DA AVG <= 7.8 mg/L Jan
004Nitrogen, ammonia total [as N]30DA AVG <= 7.7 mg/L Feb
004Nitrogen, ammonia total [as N]30DA AVG <= 5.8 mg/L May
004Nitrogen, ammonia total [as N]30DA AVG <= 4.6 mg/L Jun
004Nitrogen, ammonia total [as N]30DA AVG <= 3.9 mg/L Jul
004Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Aug
004Nitrogen, ammonia total [as N]30DA AVG <= 7.4 mg/L Dec
004Nitrogen, ammonia total [as N]30DA AVG <= 7.1 mg/L Mar
004Nitrogen, ammonia total [as N]30DA AVG <= 4.9 mg/L Oct
004Nitrogen, ammonia total [as N]30DA AVG <= 4.5 mg/L Sep
004Nitrogen, ammonia total [as N]30DA AVG <= 6.1 mg/L Nov
004Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Apr
004Nitrogen, ammonia total [as N]DAILY MX <= 18 mg/L Jan
004Nitrogen, ammonia total [as N]DAILY MX <= 18 mg/L Feb
004Nitrogen, ammonia total [as N]DAILY MX <= 32 mg/L May
004Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Jun
004Nitrogen, ammonia total [as N]DAILY MX <= 17 mg/L Jul
004Nitrogen, ammonia total [as N]DAILY MX <= 38 mg/L Aug
004Nitrogen, ammonia total [as N]DAILY MX <= 19 mg/L Dec
004Nitrogen, ammonia total [as N]DAILY MX <= 17 mg/L Mar
004Nitrogen, ammonia total [as N]DAILY MX <= 23 mg/L Oct
004Nitrogen, ammonia total [as N]DAILY MX <= 24 mg/L Sep
004Nitrogen, ammonia total [as N]DAILY MX <= 19 mg/L Nov
004Nitrogen, inorganic totalDAILY MX <= 15 mg/L all year
004Nitrogen, inorganic totalDAILY MX <= 14 mg/L all year
004Nitrogen, inorganic totalANNL MEDN report only all year
004Nitrogen, inorganic totalANNL MEDN <= 15 mg/L all year
004Nitrogen, inorganic total95th % report only all year
004Nitrogen, inorganic total95th % <= 20 mg/L all year
004Phosphorus, total [as P]ANNL MEDN report only all year
004Phosphorus, total [as P]ANNL MEDN <= 1 mg/L all year
004Phosphorus, total [as P]95th % report only all year
004Phosphorus, total [as P]95th % <= 2.5 mg/L all year
004Cyanide, weak acid, dissociableDAILY MX <= 5 ug/L all year
004Cyanide, total [as CN]DAILY MX report only all year
004Arsenic, total recoverable30DA AVG report only all year
004Iron, total recoverable30DA AVG report only all year
004Iron, total recoverable30DA AVG <= 1013 ug/L all year
004Beryllium, total recoverable [as Be]30DA AVG report only all year
004Arsenic, total [as As]DAILY MX report only all year
004Cadmium, total [as Cd]DAILY MX report only all year
004Chromium, total [as Cr]DAILY MX report only all year
004Copper, total [as Cu]DAILY MX report only all year
004Iron, dissolved [as Fe]30DA AVG <= 865 ug/L all year
004Lead, total [as Pb]DAILY MX report only all year
004Molybdenum, total [as Mo]DAILY MX report only all year
004Nickel, total [as Ni]DAILY MX report only all year
004Silver, total [as Ag]DAILY MX report only all year
004Zinc, total [as Zn]DAILY MX report only all year
004Molybdenum, total recoverable30DA AVG report only all year
004Selenium, total [as Se]DAILY MX report only all year
004Copper, potentially dissolved30DA AVG report only all year
004Copper, potentially dissolvedDAILY MX report only all year
004Manganese, potentially dissolvd30DA AVG report only all year
004Manganese, potentially dissolvdDAILY MX report only all year
004Selenium, potentially dissolvd30DA AVG <= 7.5 ug/L Apr, May, Jun, Jul, Aug, Sep, Oct
004Selenium, potentially dissolvd30DA AVG report only Mar, Dec
004Selenium, potentially dissolvdDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
004Selenium, potentially dissolvdDAILY MX report only Mar, Dec
004Oil and greaseINST MAX <= 10 mg/L all year
004Total phenolsDAILY MX report only all year
004Flow, in conduit or thru treatment plant30DA AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Chlorine, total residual30DA AVG <= .013 mg/L all year
004Chlorine, total residualINST MAX <= .02 mg/L all year
004Mercury, total [low level]30DA AVG report only all year
004E. coli30DA GM <= 205 #/100mL all year
004E. coliMX 7D GM <= 410 #/100mL all year
004Sulfide-hydrogen sulfide [undissociated]30DA AVG report only all year
004Nonylphenol30DA AVG report only all year
004NonylphenolDAILY MX report only all year
004Mercury, total [as Hg]DAILY MX report only all year
004BOD, 5-day, percent removalMO AV MN >= 85 % all year
004Solids, suspended percent removalMO AV MN >= 85 % all year
004Sulfate30DA AVG report only all year
004Sulfate30DA AVG <= 402 mg/L all year
004Styrene30DA AVG report only all year
004Boron, total30DA AVG report only all year
004Oil and grease visualINST MAX report only all year
004Static Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
004Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
004Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 87 tox chronic all year
004Static Renewal 7 Day Chronic Pimephales promelasSINGSAMP report only all year
004Static Renewal 7 Day Chronic Pimephales promelasMN VALUE report only all year
004Static Renewal 7 Day Chronic Pimephales promelasMN VALUE >= 87 tox chronic 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
300Cyanide, total [as CN]DAILY MX report only all year
300Arsenic, total [as As]DAILY MX report only all year
300Cadmium, total [as Cd]DAILY MX report only all year
300Chromium, total [as Cr]DAILY MX report only all year
300Copper, total [as Cu]DAILY MX report only all year
300Lead, total [as Pb]DAILY MX report only all year
300Molybdenum, total [as Mo]DAILY MX report only all year
300Nickel, total [as Ni]DAILY MX report only all year
300Silver, total [as Ag]DAILY MX report only all year
300Zinc, total [as Zn]DAILY MX report only all year
300Selenium, total [as Se]DAILY MX report only all year
300Total phenolsDAILY MX 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
300Mercury, total [as Hg]DAILY MX report only all year
UST1Temperature, water deg. centigradeMX WK AV report only all year
UST1Temperature, water deg. centigradeDAILY MX report only all year

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