Howard County Department of Public Works

NPDES permit MD0055174 · Major POTW · effective, expires 2031-05-31 · 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

0values over a limit
23required values missing, on 7 form(s)
1of 34 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 29 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (107)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CMX MO AV <= 5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 26 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 7.5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 39 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 1200 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 6300 lb/d Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 1800 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 9400 lb/d Jan, Feb, Mar, Nov, Dec
001Solids, total suspendedMX MO AV <= 26 mg/L all year
001Solids, total suspendedMX WK AV <= 39 mg/L all year
001Solids, total suspendedMX MO AV <= 6300 lb/d all year
001Solids, total suspendedMX WK AV <= 9400 lb/d all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]ANNL MAX report only all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, total [as N]ANNL TOT report only all year
001Nitrogen, total [as N]ANNL TOT report only all year
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX MO AV <= 1.66 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 3.53 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MX WK AV <= 2.5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 401 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 854 lb/d Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MX WK AV <= 602 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]ANNL MAX report only all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphorus, total [as P]ANNL TOT report only all year
001Phosphorus, total [as P]ANNL TOT report only all year
001Phosphate, ortho [as P]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
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, totalANNL TOT report only all year
001Flow, totalANNL TOT report only all year
101Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
101Oxygen, dissolved [DO]DLYAVMIN >= 6 mg/L all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101pHMINIMUM >= 6.5 SU all year
101pHMAXIMUM <= 8.5 SU all year
101Solids, total suspendedANNL MAX <= 2284170 lb/yr all year
101Solids, total suspendedMO TOTAL report only all year
101Solids, total suspendedMO AVG report only all year
101Solids, total suspendedMO AVG report only all year
101Nitrogen, total [as N]ANNL MAX <= 309715 lb/yr all year
101Nitrogen, total [as N]MO TOTAL report only all year
101Nitrogen, total [as N]CUM TOTL report only all year
101Nitrogen, total [as N]MO TOTAL report only all year
101Nitrogen, organic total [as N]MO AVG report only all year
101Nitrogen, ammonia total [as N]MO AVG report only all year
101Nitrite + Nitrate total [as N]MO AVG report only all year
101Phosphorus, total [as P]CUM TOTL <= 23358 lb/yr all year
101Phosphorus, total [as P]MO TOTAL report only all year
101Cyanide, free [amenable to chlorination]QRTR AVG report only Mar, Jun, Sep, Dec
101Phosphate, ortho [as P]MO AVG report only all year
101Benzo[b]fluorantheneQRTR AVG report only Mar, Jun, Sep, Dec
101Benzo[a]pyreneQRTR AVG report only Mar, Jun, Sep, Dec
101ChryseneQRTR AVG report only Mar, Jun, Sep, Dec
101Indeno[1,2,3-cd]pyreneQRTR AVG report only Mar, Jun, Sep, Dec
101N-Nitrosodi-N-propylamineQRTR AVG report only Mar, Jun, Sep, Dec
101N-Nitrosodimethylamine [NDMA]QRTR AVG report only Mar, Jun, Sep, Dec
101Benzo[a]anthraceneQRTR AVG report only Mar, Jun, Sep, Dec
101Dibenz[a,h]anthraceneQRTR AVG report only Mar, Jun, Sep, Dec
1012,3,7,8-Tetrachlorodibenzo-p-dioxinQRTR AVG report only Mar, Jun, Sep, Dec
101BenzidineQRTR AVG report only Mar, Jun, Sep, Dec
101AldrinQRTR AVG report only Mar, Jun, Sep, Dec
101DieldrinQRTR AVG report only Mar, Jun, Sep, Dec
101ToxapheneQRTR AVG report only Mar, Jun, Sep, Dec
101HeptachlorQRTR AVG report only Mar, Jun, Sep, Dec
101HexachlorobenzeneQRTR AVG report only Mar, Jun, Sep, Dec
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Chlorine, total residualMAXIMUM <= .1 mg/L all year
101E. coliGX <= 126 MPN/100mL all year
1011,2,4,5-TetrachlorobenzeneQRTR AVG report only Mar, Jun, Sep, Dec
101Polychlorinated biphenyls [PCB] pg/LANNL MAX report only all year
101BOD, 5-day, percent removalMO AV MN >= 85 % all year
101Solids, suspended percent removalMO AV MN >= 85 % all year
101Flow, totalMO TOTAL report only all year
102Solids, total suspendedMO TOTAL report only all year
102Nitrogen, total [as N]MO TOTAL report only all year
102Phosphorus, total [as P]MO TOTAL report only all year
102Flow, in conduit or thru treatment plantMO AVG report only all year
102Flow, in conduit or thru treatment plantDAILY MX report only all year
102Chlorine, total residualMO AVG report only all year
102Solids, suspended percent removalMO AV MN >= 85 % all year
102Flow, totalMO TOTAL report only all year
TRADSolids, total suspendedCUM TOTL report only all year
TRADSolids, total suspendedCUM TOTL 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
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
TRADPhosphorus, total [as P]CUM TOTL report only all year
TRADPhosphorus, total [as P]CUM TOTL report only all year
TRADFlow, totalYA report only all year
TRADFlow, totalYA report only all year

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