CITY OF BOULDER

NPDES permit MT0023078 · Minor POTW · administratively continued, expires 2025-11-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2025-11-30 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)
3of 13 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (49)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitVALUE report only all year
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001Flow rateMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 45 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 68 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMX WK AV report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMX WK AV <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 45 lb/d all year
001Solids, total suspendedMX WK AV <= 68 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMX WK AV report only all year
001Oil & GreaseDAILY MX <= 10 mg/L all year
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, total [as N]DAILY MX report only Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 10.1 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 20.2 mg/L all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001Phosphorus, total [as P]DAILY MX report only Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001Hardness, total [as CaCO3]VALUE report only all year
001Arsenic, total recoverableVALUE report only all year
001Iron, total recoverableVALUE report only all year
001Zinc, total recoverableVALUE report only all year
001Cadmium, total recoverableVALUE report only all year
001Lead, total recoverableVALUE report only all year
001Copper, total recoverableVALUE report only all year
001E. coli, MTEC-MFMOAV GEO <= 630 #/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMOAV GEO <= 126 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMX WK AV <= 1260 #/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMX WK AV <= 252 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalMINIMUM >= 85 % all year
001Oil and grease visualVALUE report only all year
RIVNitrogen, total [as N]VALUE report only Jul, Aug, Sep
RIVNitrogen, Kjeldahl, total [as N]VALUE report only Jul, Aug, Sep
RIVNitrite + Nitrate total [as N]VALUE report only Jul, Aug, Sep
RIVPhosphorus, total [as P]VALUE report only Jul, Aug, Sep

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