Public Service Co of Colorado

NPDES permit CO0001104 · Major NON-POTW · administratively continued, expires 2023-06-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2023-06-30 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

5values over a limit
12required values missing, on 2 form(s)
0of 99 forms filed late

Last period with anything received: 2026-07-31. Most often over: Sulfate (1), pH (1), Solids, total suspended (1).

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 (98)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 13 mg/L all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 42 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 4.2 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 4 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 3.2 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 3.8 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 6.8 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 8.6 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 6.8 mg/L Dec
001Nitrogen, inorganic totalDAILY MX <= 20 mg/L all year
001Nitrogen, inorganic totalDAILY MX <= 10 mg/L all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Chloride [as Cl]30DA AVG report only all year
001Chloride [as Cl]30DA AVG <= 250 mg/L all year
001FluorideDAILY MX report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG <= 1000 ug/L all year
001Chromium, total [as Cr]30DA AVG <= 170 ug/L all year
001Chromium, total [as Cr]30DA AVG <= 190 ug/L all year
001Chromium, total [as Cr]DAILY MX <= 170 ug/L all year
001Chromium, total [as Cr]DAILY MX <= 190 ug/L all year
001Iron, dissolved [as Fe]30DA AVG <= 300 ug/L all year
001Manganese, dissolved [as Mn]30DA AVG report only all year
001Manganese, dissolved [as Mn]DAILY MX report only all year
001Nickel, total recoverable30DA AVG report only all year
001Zinc, total [as Zn]30DA AVG <= 860 ug/L all year
001Zinc, total [as Zn]30DA AVG <= 950 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 860 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 950 ug/L all year
001Cadmium, total recoverableDAILY MX report only all year
001Lead, total recoverableDAILY MX report only all year
001Molybdenum, total recoverable30DA AVG report only all year
001Chromium, hexavalent dissolved [as Cr]30DA AVG report only all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
001Zinc, potentially dissolved30DA AVG report only all year
001Zinc, potentially dissolvedDAILY MX report only all year
001Silver, potentially dissolved30DA AVG report only all year
001Silver, potentially dissolvedDAILY MX report only all year
001Copper, potentially dissolved30DA AVG <= 28 ug/L all year
001Copper, potentially dissolvedDAILY MX <= 38 ug/L all year
001Cadmium, potentially dissolvd30DA AVG report only all year
001Cadmium, potentially dissolvdDAILY MX report only all year
001Lead, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvdDAILY MX report only all year
001Nickel, potentially dissolvd30DA AVG report only all year
001Nickel, potentially dissolvdDAILY MX report only all year
001Selenium, potentially dissolvd30DA AVG <= 6.4 ug/L all year
001Selenium, potentially dissolvd30DA AVG <= 5.5 ug/L all year
001Selenium, potentially dissolvdDAILY MX <= 21 ug/L all year
001Selenium, potentially dissolvdDAILY MX <= 21 ug/L all year
001Oil and grease30DA AVG <= 6.3 mg/L all year
001Oil and greaseINST MAX <= 8.5 mg/L all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Chromium, trivalent total recoverable30DA AVG report only all year
001Chromium, trivalent total recoverableDAILY MX report only all year
001Flow, in conduit or thru treatment plant30DA AVG <= 3.1 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residual30DA AVG <= .011 mg/L all year
001Chlorine, total residualINST MAX <= .019 mg/L all year
001Mercury, total [low level]30DA AVG report only all year
001E. coli30DA GM report only all year
001E. coli30DA GM <= 126 #/100mL all year
001E. coliMX 7D GM report only all year
001E. coliMX 7D GM <= 252 #/100mL all year
001Chromium, trivalent dissolved, as Cr30DA AVG report only all year
001Chromium, trivalent dissolved, as CrDAILY MX report only all year
001Sulfate30DA AVG report only all year
001Sulfate30DA AVG <= 533 mg/L all year
001Boron, total30DA AVG <= 1.2 mg/L all year
001Oil and grease visualINST MAX report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 65 tox chronic all year
001Static Renewal 7 Day Chronic Pimephales promelasSINGSAMP report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE >= 65 tox chronic all year
101Priority pollutants scan [yes/no]30DA AVG report only all year
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plantDN <= 9.7 MGD all year
301Flow, in conduit or thru treatment plant30DA AVG report only all year
301Flow, in conduit or thru treatment plantDAILY MX <= 9.7 MGD all year
302Flow, in conduit or thru treatment plant30DA AVG report only all year
302Flow, in conduit or thru treatment plantDAILY MX <= 9.7 MGD all year
304Flow, in conduit or thru treatment plant30DA AVG report only all year
304Flow, in conduit or thru treatment plantDAILY MX report only all year
305Flow, in conduit or thru treatment plant30DA AVG report only all year
305Flow, in conduit or thru treatment plantDAILY MX report only all year
306Flow, in conduit or thru treatment plant30DA AVG report only all year
306Flow, 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