TOWN OF DELMAR

NPDES permit MD0020532 · Minor POTW · effective, expires 2031-07-31 · 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.

EPA's record, 2025-09-01 to 2026-08-31

6values over a limit
0required values missing, on 0 form(s)
1of 34 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (6).

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 (77)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 20 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 140 lb/d Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX MO AV <= 210 lb/d Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 210 lb/d Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX WK AV <= 320 lb/d Jan, Feb, Mar, Oct, Nov, Dec
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMX MO AV <= 21 mg/L all year
001Solids, total suspendedMX WK AV <= 31 mg/L all year
001Solids, total suspendedMX MO AV <= 148 lb/d all year
001Solids, total suspendedMX WK AV <= 222 lb/d all year
001Solids, total suspendedANNL MAX <= 54000 lb/yr all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedVALUE report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]ANNL MAX <= 10355 lb/yr all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, total [as N]TOTAL report only all year
001Nitrogen, total [as N]TOTAL report only all year
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX MO AV <= 1.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 3 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX DA AV <= 10.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX DA AV <= 12.5 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX DA AV <= 75.5 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX DA AV <= 88.7 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 10.6 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 21.3 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MX MO AV <= .38 mg/L all year
001Phosphorus, total [as P]MX WK AV <= .58 mg/L all year
001Phosphorus, total [as P]MX MO AV <= 2.7 lb/d all year
001Phosphorus, total [as P]ANNL MAX <= 777 lb/yr all year
001Phosphorus, total [as P]MX WK AV <= 4.1 lb/d all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphorus, total [as P]TOTAL report only all year
001Phosphorus, total [as P]TOTAL report only all year
001Phosphate, ortho [as P]MO AVG report only all year
001Benzo[k]fluorantheneQRTR AVG report only Mar, Jun, Sep, Dec
001Benzo[a]pyreneQRTR AVG report only Mar, Jun, Sep, Dec
001Indeno[1,2,3-cd]pyreneQRTR AVG report only Mar, Jun, Sep, Dec
001Dibenz[a,h]anthraceneQRTR AVG report only Mar, Jun, Sep, Dec
001BenzidineQRTR AVG report only Mar, Jun, Sep, Dec
0014,4'-DDTQRTR AVG report only Mar, Jun, Sep, Dec
001AldrinQRTR AVG report only Mar, Jun, Sep, Dec
001DieldrinQRTR AVG report only Mar, Jun, Sep, Dec
001Endosulfan, totalQRTR AVG report only Mar, Jun, Sep, Dec
001EndrinQRTR AVG report only Mar, Jun, Sep, Dec
001ToxapheneQRTR AVG report only Mar, Jun, Sep, Dec
001HeptachlorQRTR AVG report only Mar, Jun, Sep, Dec
001Heptachlor epoxideQRTR AVG report only Mar, Jun, Sep, Dec
001HexachlorobenzeneQRTR AVG report only Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMAXIMUM <= .1 mg/L all year
001ChlordaneQRTR AVG report only Mar, Jun, Sep, Dec
001E. coliGX <= 126 MPN/100mL all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Flow, totalMO TOTAL report only all year
001Flow, totalTOTAL report only all year
001Flow, totalTOTAL report only all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101Solids, total suspendedMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
TRADSolids, total suspendedCUM TOTL report only all year
TRADSolids, total suspendedCUM TOTL report only all year
TRADNitrogen, total [as N]CUM TOTL report only all year
TRADNitrogen, total [as N]CUM TOTL report only all year
TRADPhosphorus, total [as P]CUM TOTL report only all year
TRADPhosphorus, total [as P]CUM TOTL report only all year
TRADFlowYA 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