Denver Water

NPDES permit CO0048721 · Minor NON-POTW · administratively continued, expires 2016-04-30 · 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 2016-04-30 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 15 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 (44)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 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
001Nitrogen, ammonia total [as N]30DA AVG <= 4.6 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 5.1 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 5.6 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 5.7 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 5.9 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 5.5 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 5.3 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 4.9 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 4.5 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 4.2 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 4.2 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 4.3 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 29 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 27 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 26 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 25 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 25 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 26 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 27 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 28 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 30 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 33 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 33 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 32 mg/L Sep
001Nitrogen, nitrite total [as N]DAILY MX <= .05 mg/L all year
001Nitrogen, nitrite total [as N]DAILY MX <= .5 mg/L all year
001Nitrogen, nitrate total [as N]DAILY MX report only all year
001Copper, potentially dissolved30DA AVG report only all year
001Copper, potentially dissolvedDAILY MX report only all year
001Selenium, potentially dissolvd30DA AVG report only all year
001Selenium, potentially dissolvdDAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= 10 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
001E. coli30DA AVG <= 126 #/100mL all year
001E. coliMX 7D AV <= 252 #/100mL all year
001Mercury, total [as Hg]30DA AVG report only all year
001Oil and grease visualINST MAX 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