UPPER POTOMAC RIVER COMMISSION

NPDES permit MD0021687 · Major NON-POTW · administratively continued, expires 2019-08-31 · 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 2019-08-31 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

8values over a limit
0required values missing, on 0 form(s)
16of 44 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, total [as N] (8).

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 (53)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY MX <= 100 deg F all year
001TurbidityMX MO AV <= 150 NTU all year
001TurbidityDAILY MX <= 300 NTU all year
001Color [PT-CO units]MO AVG report only all year
001Color [PT-CO units]DAILY MX report only all year
001ColorMX MO AV <= 75060 lb/d all year
001ColorDAILY MX <= 138860 lb/d all year
001Oxygen, dissolved [DO]MINIMUM >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 52 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 100 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 8023 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX <= 15429 lb/d all year
001pHMINIMUM report only all year
001pHMAXIMUM report only all year
001Solids, total suspendedMX MO AV <= 50 mg/L all year
001Solids, total suspendedDAILY MX <= 110 mg/L all year
001Solids, total suspendedMX MO AV <= 7715 lb/d all year
001Solids, total suspendedDAILY MX <= 16972 lb/d all year
001Nitrogen, total [as N]MX MO AV <= 4 mg/L all year
001Nitrogen, total [as N]DAILY MX <= 8 mg/L all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, total [as N]CUM TOTL report only all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, total [as N]CUM TOTL <= 79218 lb/yr all year
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, organic total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia 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 all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphorus, total [as P]CUM TOTL report only all year
001Phosphorus, total [as P]CUM TOTL <= 30773 lb/yr all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Nitrogen, total [as N] [adjusted]MO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, totalMO TOTAL report only all year
001pH range excursions, > 60 minutesMAXIMUM <= 0 occur/mo all year
001pH range excursions, monthly total accumMAXIMUM <= 446 min all year
01ATurbidityMX MO AV <= 50 NTU all year
01ATurbidityDAILY MX <= 150 NTU all year
01AColor [PT-CO units]WKLY AVG <= 75 col unit (pc) all year
01AColor [PT-CO units]DAILY MX <= 150 col unit (pc) all year
101E. coliGX <= 126 MPN/100mL all year
901Nitrogen, total [as N]MO AVG report only all year
901Phosphorus, total [as P]MO AVG 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