AMERICAN WATER OPERATIONS and MAINTENANCE, INC.

NPDES permit MD0021717 · Major NON-POTW · expired, expires 2025-07-31 · 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.

This permit expired on 2025-07-31 and is expired: 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)
0of 27 forms filed late

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

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 (128)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 250 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 750 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 380 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 750 lb/d all year
001Solids, total suspendedANNL MAX <= 410400 lb/yr all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedWKLY AVG <= 1100 lb/d all year
001Solids, total suspendedCUM TOTL report only all year
001Solids, total suspendedMO TOTAL report only all year
001Nitrogen, total [as N]ANNL MAX <= 54820 lb/yr 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, total [as N]CUM TOTL report only all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 2 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX WK AV <= 3 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 50 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX WK AV <= 75 lb/d May, Jun, Jul, Aug, Sep, Oct
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]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]ANNL MAX <= 4112 lb/yr 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
001Phosphorus, total [as P]CUM TOTL report only all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Nickel, total recoverableMO AVG report only all year
001Nickel, total recoverableMO AVG report only all year
001Silver total recoverableMO AVG report only all year
001Silver total recoverableMO AVG report only all year
001Zinc, total recoverableMO AVG report only all year
001Zinc, total recoverableMO AVG report only all year
001Cadmium, total recoverableMO AVG report only all year
001Cadmium, total recoverableMO AVG report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableMO AVG report only all year
001Chromium, total recoverableMO AVG report only all year
001Chromium, total recoverableMO AVG report only all year
001Copper, total recoverableMO AVG report only all year
001Copper, total recoverableMO AVG report only all year
001Phosphate, ortho [as P]MO AVG report only all year
001AcroleinQRTR AVG report only Mar, Jun, Sep, Dec
0013,3'-DichlorobenzidineQRTR AVG report only Mar, Jun, Sep, Dec
001BenzidineQRTR AVG report only Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Chlorine, total residualMAXIMUM <= .1 mg/L all year
001E. coliGX <= 126 MPN/100mL all year
001Volatile Organic Compound [VOC]QRTR AVG report only Mar, Jun, Sep, Dec
001Total toxic organics [TTO] [40 CFR413]QRTR AVG report only Mar, Jun, Sep, Dec
001Cyanide, total recoverableMO AVG report only all year
001Cyanide, total recoverableMO AVG report only all year
001Polychlorinated biphenyls [PCB] pg/LANNL MAX report only Mar, Jun, Sep, Dec
001Flow, totalTOTAL report only all year
001Flow, totalANNL TOT report only all year
001Flow, totalANNL TOT report only all year
101Solids, total suspendedMO TOTAL report only all year
101Solids, total suspendedCUM TOTL report only all year
101Solids, total suspendedCUM TOTL report only all year
101Solids, total suspendedMO 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, total [as N]CUM TOTL report only all year
101Nitrogen, total [as N]MO TOTAL report only all year
101Phosphorus, total [as P]CUM TOTL report only all year
101Phosphorus, total [as P]MO TOTAL report only all year
101Phosphorus, total [as P]CUM TOTL report only all year
101Phosphorus, total [as P]MO TOTAL report only all year
101Flow, in conduit or thru treatment plantMO TOTAL report only all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Flow, totalTOTAL report only all year
101Flow, totalMO TOTAL report only all year
201Cyanide, total [as CN]MX MO AV <= .65 mg/L all year
201Cyanide, total [as CN]MX MO AV <= .65 mg/L all year
201Cyanide, total [as CN]MX DA AV <= 1.2 mg/L all year
201Cyanide, total [as CN]MX DA AV <= 1.2 mg/L all year
201Cadmium, total [as Cd]MX MO AV <= .26 mg/L all year
201Cadmium, total [as Cd]MX MO AV <= .26 mg/L all year
201Cadmium, total [as Cd]MX DA AV <= .69 mg/L all year
201Cadmium, total [as Cd]MX DA AV <= .69 mg/L all year
201Chromium, total [as Cr]MX MO AV <= 1.71 mg/L all year
201Chromium, total [as Cr]MX MO AV <= 1.71 mg/L all year
201Chromium, total [as Cr]MX DA AV <= 2.77 mg/L all year
201Chromium, total [as Cr]MX DA AV <= 2.77 mg/L all year
201Copper, total [as Cu]MX MO AV <= 2.07 mg/L all year
201Copper, total [as Cu]MX MO AV <= 2.07 mg/L all year
201Copper, total [as Cu]MX DA AV <= 3.38 mg/L all year
201Copper, total [as Cu]MX DA AV <= 3.38 mg/L all year
201Lead, total [as Pb]MX MO AV <= .43 mg/L all year
201Lead, total [as Pb]MX MO AV <= .43 mg/L all year
201Lead, total [as Pb]MX DA AV <= .69 mg/L all year
201Lead, total [as Pb]MX DA AV <= .69 mg/L all year
201Nickel, total recoverableMX MO AV <= 2.38 mg/L all year
201Nickel, total recoverableMX MO AV <= 2.38 mg/L all year
201Nickel, total recoverableMX DA AV <= 3.98 mg/L all year
201Nickel, total recoverableMX DA AV <= 3.98 mg/L all year
201Silver, total [as Ag]MX MO AV <= .24 mg/L all year
201Silver, total [as Ag]MX MO AV <= .24 mg/L all year
201Silver, total [as Ag]MX DA AV <= .43 mg/L all year
201Silver, total [as Ag]MX DA AV <= .43 mg/L all year
201Zinc, total [as Zn]MX MO AV <= 1.48 mg/L all year
201Zinc, total [as Zn]MX MO AV <= 1.48 mg/L all year
201Zinc, total [as Zn]MX DA AV <= 2.61 mg/L all year
201Zinc, total [as Zn]MX DA AV <= 2.61 mg/L all year
201Flow, in conduit or thru treatment plantMAXIMUM report only all year
201Flow, in conduit or thru treatment plantMAXIMUM report only all year
201Flow, in conduit or thru treatment plantMO TOTAL report only all year
201Flow, in conduit or thru treatment plantMO TOTAL report only all year
201Flow, in conduit or thru treatment plantDAILY AV report only all year
201Flow, in conduit or thru treatment plantDAILY AV report only all year
201Total toxic organics [TTO] [40 CFR467]MX DA AV <= 2.13 mg/L all year
201Total toxic organics [TTO] [40 CFR467]MX DA AV <= 2.13 mg/L 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