Silverthorne Dillon Joint Sewer Authority

NPDES permit CO0020826 · Major POTW · administratively continued, expires 2020-06-30 · 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 2020-06-30 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 76 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 (206)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
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
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 24 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 28 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 26 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 40 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 40 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 25 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 27 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 40 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 32 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 35 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 40 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 13.6 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 14.3 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 15.3 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 22 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 13.8 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 22 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 14.8 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 22 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 17.6 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 19.3 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 22 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 9.2 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 10.3 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 10.7 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 14.9 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 14.9 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 9.3 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 10 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 14.9 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 11.9 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 13 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 14.9 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 22 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 14.9 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 40 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 180 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 105 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 150 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 82 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 125 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 135 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 120 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 91 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 105 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 44 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 86 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 105 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 92 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 60 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 48 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 81 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 75 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 73 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 54 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 63 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 26 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 51 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 78 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 46 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 67 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 35 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 54 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 58 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 53 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 39 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 45 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 19 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 37 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 49 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 36 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 83 mg/L Dec
001Phosphorus, total [as P]RM <= 1.7 mg/L all year
001Phosphorus, total [as P]RM <= 4.4 mg/L all year
001Phosphorus, total [as P]RM <= 2.4 mg/L all year
001Cyanide, total [as CN]ANNL AVG report only all year
001Cyanide, total [as CN]DAILY MX report only all year
001Arsenic, total [as As]ANNL AVG report only all year
001Arsenic, total [as As]DAILY MX report only all year
001Cadmium, total [as Cd]ANNL AVG report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Chromium, total [as Cr]ANNL AVG report only all year
001Chromium, total [as Cr]DAILY MX report only all year
001Copper, total [as Cu]ANNL AVG report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Lead, total [as Pb]ANNL AVG report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Molybdenum, total [as Mo]ANNL AVG report only all year
001Molybdenum, total [as Mo]DAILY MX report only all year
001Nickel, total [as Ni]ANNL AVG report only all year
001Nickel, total [as Ni]DAILY MX report only all year
001Silver, total [as Ag]ANNL AVG report only all year
001Silver, total [as Ag]DAILY MX report only all year
001Zinc, total [as Zn]ANNL AVG report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Selenium, total [as Se]ANNL AVG report only all year
001Selenium, total [as Se]DAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Oil and greaseINST MAX <= 10 mg/L 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 <= 1.5 MGD all year
001Flow, in conduit or thru treatment plant30DA AVG <= 2.7 MGD all year
001Flow, in conduit or thru treatment plant30DA AVG <= 4 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residual30DA AVG <= .095 mg/L all year
001Chlorine, total residual30DA AVG <= .053 mg/L all year
001Chlorine, total residual30DA AVG <= .036 mg/L all year
001Chlorine, total residualINST MAX <= .47 mg/L all year
001Chlorine, total residualINST MAX <= .27 mg/L all year
001Chlorine, total residualINST MAX <= .19 mg/L all year
001E. coli30DA GM <= 1507 #/100mL all year
001E. coli30DA GM <= 837 #/100mL all year
001E. coli30DA GM <= 565 #/100mL all year
001E. coliMX 7D GM <= 3014 #/100mL all year
001E. coliMX 7D GM <= 1674 #/100mL all year
001E. coliMX 7D GM <= 1130 #/100mL all year
001Nitrogen, Total As NRM <= 36.6 mg/L all year
001Nitrogen, Total As NRM <= 20.6 mg/L all year
001Nitrogen, Total As NRM report only all year
001Nitrogen, Total As NRM <= 14.4 mg/L all year
001Nitrogen, Total As NRM report only all year
001Nonylphenol30DA AVG report only all year
001Nonylphenol30DA AVG report only all year
001NonylphenolDAILY MX report only all year
001NonylphenolDAILY MX report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Mercury, total [as Hg]ANNL AVG report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Solids, suspended 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
001Oil and grease visualINST MAX report only all year
001Oil and grease visualINST MAX report only all year
001LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaMN VALUE >= 100 % all year
001LC50 Static Renewal 96Hr Acute Pimephales promelasMN VALUE >= 100 % all year
01BLead, potentially dissolvd30DA AVG report only all year
01BLead, potentially dissolvdDAILY MX report only all year
01BLead, potentially dissolvdROLL AVG report only all year
01BLC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaMN VALUE >= 100 % all year
01BLC50 Static Renewal 96Hr Acute Pimephales promelasMN VALUE >= 100 % all year
01CCopper, potentially dissolved30DA AVG report only all year
01CCopper, potentially dissolvedDAILY MX report only all year
01CCopper, potentially dissolvedROLL AVG report only all year
01CLead, potentially dissolvd30DA AVG report only all year
01CLead, potentially dissolvdDAILY MX report only all year
01CLead, potentially dissolvdROLL AVG report only all year
01CStatic Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
01CStatic Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
01CStatic Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 9.4 tox chronic all year
01CStatic Renewal 7 Day Chronic Pimephales promelasSINGSAMP report only all year
01CStatic Renewal 7 Day Chronic Pimephales promelasMN VALUE report only all year
01CStatic Renewal 7 Day Chronic Pimephales promelasMN VALUE >= 9.4 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
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plantDAILY MX report only all year
UST1Temperature, water deg. centigradeMX WK AV report only all year
UST1Temperature, water deg. centigradeDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states