Aurora City of

NPDES permit CO0049053 · Minor NON-POTW · administratively continued, expires 2025-08-31 · 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 2025-08-31 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 88 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 (64)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Aluminum, total recoverable30DA AVG <= 994 ug/L all year
001Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= .004211 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Sulfate30DA AVG report only all year
001SulfateDAILY MX report only all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002Aluminum, total recoverable30DA AVG <= 994 ug/L all year
002Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
002Flow, in conduit or thru treatment plant30DA AVG <= .004443 MGD all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Sulfate30DA AVG report only all year
002SulfateDAILY MX report only all year
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Aluminum, total recoverable30DA AVG <= 994 ug/L all year
003Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
003Flow, in conduit or thru treatment plant30DA AVG <= .018949 MGD all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Sulfate30DA AVG report only all year
003SulfateDAILY MX report only all year
004pHMINIMUM >= 6.5 SU all year
004pHMAXIMUM <= 9 SU all year
004Aluminum, total recoverable30DA AVG <= 994 ug/L all year
004Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
004Flow, in conduit or thru treatment plant30DA AVG <= .003718 MGD all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Sulfate30DA AVG report only all year
004SulfateDAILY MX report only all year
005pHMINIMUM >= 6.5 SU all year
005pHMAXIMUM <= 9 SU all year
005Aluminum, total recoverable30DA AVG <= 994 ug/L all year
005Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
005Flow, in conduit or thru treatment plant30DA AVG <= .001603 MGD all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Sulfate30DA AVG report only all year
005SulfateDAILY MX report only all year
006pHMINIMUM >= 6.5 SU all year
006pHMAXIMUM <= 9 SU all year
006Aluminum, total recoverable30DA AVG <= 994 ug/L all year
006Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
006Flow, in conduit or thru treatment plant30DA AVG <= .004637 MGD all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006Sulfate30DA AVG report only all year
006SulfateDAILY MX report only all year
007pHMINIMUM >= 6.5 SU all year
007pHMAXIMUM <= 9 SU all year
007Aluminum, total recoverable30DA AVG <= 994 ug/L all year
007Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
007Flow, in conduit or thru treatment plant30DA AVG <= .002232 MGD all year
007Flow, in conduit or thru treatment plantDAILY MX report only all year
007Sulfate30DA AVG report only all year
007SulfateDAILY MX report only all year
008pHMINIMUM >= 6.5 SU all year
008pHMAXIMUM <= 9 SU all year
008Aluminum, total recoverable30DA AVG <= 994 ug/L all year
008Aluminum, total recoverableDAILY MX <= 6961 ug/L all year
008Flow, in conduit or thru treatment plant30DA AVG <= .000298 MGD all year
008Flow, in conduit or thru treatment plantDAILY MX report only all year
008Sulfate30DA AVG report only all year
008SulfateDAILY 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