MATTAWOMAN WWTP

NPDES permit MD0021865 · Major POTW · effective, expires 2029-07-31 · 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

7values over a limit
0required values missing, on 0 form(s)
0of 44 forms filed late

Last period with anything received: 2026-07-31. Most often over: Phosphorus, total [as P] (5), Solids, total suspended (2).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MD permits in EPA's filings — check your permit).

Limits in force (62)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MN WK AV >= 6 mg/L Feb, Mar, Apr, May
001Oxygen, dissolved [DO]MO AV MN >= 5.5 mg/L Jan, Jun, Jul, Aug, Sep, Oct, Nov, Dec
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 23 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 34 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 3800 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 5600 lb/d all year
001pHMINIMUM >= 6.3 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMX MO AV <= 23 mg/L all year
001Solids, total suspendedMX WK AV <= 34 mg/L all year
001Solids, total suspendedMX MO AV <= 3800 lb/d all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedMX WK AV <= 5600 lb/d all year
001Solids, total suspendedANNL MAX <= 1400286 lb/yr all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, total [as N]ANNL MAX <= 243645 lb/yr all year
001Nitrogen, total [as N]ANNL TOT report only Dec
001Nitrogen, 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]MO AVG <= 6.9 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX DA AV <= 11 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 1150 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX WK AV <= 1835 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MX MO AV <= .18 mg/L all year
001Phosphorus, total [as P]MX WK AV <= .27 mg/L all year
001Phosphorus, total [as P]MX MO AV <= 30 lb/d all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphorus, total [as P]MX WK AV <= 45 lb/d all year
001Phosphorus, total [as P]ANNL TOT report only Dec
001Phosphorus, total [as P]ANNL MAX <= 10964 lb/yr all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO MAX report only all year
001Chlorine, total residualDAILY MX <= .1 mg/L all year
001EnterococciMAXIMUM <= 35 MPN/100mL all year
001Phosphorous, in total orthophosphateMO AVG report only all year
001Bromide [as Br]VALUE report only Mar, Jun, Sep, Dec
001Polychlorinated biphenyls [PCB] pg/LQT report only Mar, Jun, Sep, Dec
001Polychlorinated biphenyls [PCB] pg/LANNL TOT report only Dec
001BOD, 5-day, percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalMINIMUM >= 85 % all year
001Flow, totalMO TOTAL report only all year
101TurbidityVALUE report only all year
101Chlorine, total residualMAXIMUM report only all year
101FlowMO AVG report only all year
101FlowDAILY MX report only all year
101Flow, totalMO TOTAL report only all year
102BOD, 5-day, 20 deg. CMO AVG report only all year
102Solids, total suspendedMO 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