Commissioners of Ridgely

NPDES permit MD0020427 · Minor POTW · expired, expires 2023-08-31 · 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 2023-08-31 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
22required values missing, on 7 form(s)
10of 40 forms filed late

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

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 (100)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L Jan, Feb, Mar
001BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 50 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 75 lb/d all year
001pHMINIMUM >= 6.5 SU Jan, Feb, Mar
001pHMAXIMUM <= 8 SU Jan, Feb, Mar
001Solids, total suspendedMX MO AV <= 90 mg/L all year
001Solids, total suspendedMX MO AV <= 150 lb/d all year
001Nitrogen, total [as N]MO AVG 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, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX MO AV <= 3.3 mg/L all year
001Nitrogen, ammonia total [as N]MX DA AV <= 10 mg/L all year
001Nitrogen, ammonia total [as N]MX MO AV <= 5.5 lb/d all year
001Nitrogen, ammonia total [as N]MX DA AV <= 17 lb/d all year
001Nitrite + Nitrate total [as N]MO AVG report only Jan, Feb, Mar
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]CUM TOTL report only all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphate, ortho [as P]MO AVG report only Jan, Feb, Mar
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 residualDAILY MX <= .02 mg/L Jan, Feb, Mar
001E. coliGX <= 126 MPN/100mL all year
001Turbidity, lab, NTUMX MO AV <= 50 NTU all year
001Flow, totalMO TOTAL report only all year
002BOD, 5-day, 20 deg. CMX MO AV <= 70 mg/L all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9.5 SU all year
002Solids, total suspendedMX MO AV <= 90 mg/L all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Coliform, fecal generalMX MO AV < 200 MPN/100mL all year
MW1pHVALUE report only all year
MW1Nitrogen, total [as N]VALUE report only all year
MW1Nitrogen, Kjeldahl, total [as N]VALUE report only all year
MW1Phosphate, total [as PO4]VALUE report only all year
MW1ChlorideVALUE report only all year
MW1Solids, total dissolvedVALUE report only all year
MW1Nitrogen, nitrate total [as NO3]VALUE report only all year
MW1Nitrogen, nitrite total [as NO2]VALUE report only all year
MW1Coliform, fecal generalVALUE report only all year
MW2pHVALUE report only all year
MW2Nitrogen, total [as N]MX MO AV <= 10 mg/L all year
MW2Nitrogen, Kjeldahl, total [as N]VALUE report only all year
MW2Phosphate, total [as PO4]VALUE report only all year
MW2ChlorideM0 <= 250 mg/L all year
MW2Solids, total dissolvedM0 <= 500 mg/L all year
MW2Nitrogen, nitrate total [as NO3]ANNL MAX <= 10 mg/L all year
MW2Nitrogen, nitrite total [as NO2]ANNL MAX <= 1 mg/L all year
MW2Coliform, fecal generalM0 <= 2 MPN/100mL all year
MW3pHVALUE report only all year
MW3Nitrogen, total [as N]MX MO AV <= 10 mg/L all year
MW3Nitrogen, Kjeldahl, total [as N]VALUE report only all year
MW3Phosphate, total [as PO4]VALUE report only all year
MW3ChlorideM0 <= 250 mg/L all year
MW3Solids, total dissolvedM0 <= 500 mg/L all year
MW3Nitrogen, nitrate total [as NO3]ANNL MAX <= 10 mg/L all year
MW3Nitrogen, nitrite total [as NO2]ANNL MAX <= 1 mg/L all year
MW3Coliform, fecal generalM0 <= 2 MPN/100mL all year
MW4pHVALUE report only all year
MW4Nitrogen, total [as N]MX MO AV <= 10 mg/L all year
MW4Nitrogen, Kjeldahl, total [as N]VALUE report only all year
MW4Phosphate, total [as PO4]VALUE report only all year
MW4ChlorideM0 <= 250 mg/L all year
MW4Solids, total dissolvedM0 <= 500 mg/L all year
MW4Nitrogen, nitrate total [as NO3]ANNL MAX <= 10 mg/L all year
MW4Nitrogen, nitrite total [as NO2]ANNL MAX <= 1 mg/L all year
MW4Coliform, fecal generalM0 <= 2 MPN/100mL all year
MW5pHVALUE report only all year
MW5Nitrogen, total [as N]VALUE report only all year
MW5Nitrogen, Kjeldahl, total [as N]VALUE report only all year
MW5Phosphate, total [as PO4]VALUE report only all year
MW5ChlorideVALUE report only all year
MW5Solids, total dissolvedVALUE report only all year
MW5Nitrogen, nitrate total [as NO3]VALUE report only all year
MW5Nitrogen, nitrite total [as NO2]VALUE report only all year
MW5Coliform, fecal generalVALUE report only all year
MW6pHVALUE report only all year
MW6Nitrogen, total [as N]VALUE report only all year
MW6Nitrogen, Kjeldahl, total [as N]VALUE report only all year
MW6Phosphate, total [as PO4]VALUE report only all year
MW6ChlorideVALUE report only all year
MW6Solids, total dissolvedVALUE report only all year
MW6Nitrogen, nitrate total [as NO3]VALUE report only all year
MW6Nitrogen, nitrite total [as NO2]VALUE report only all year
MW6Coliform, fecal generalVALUE report only all year
MW7pHVALUE report only all year
MW7Nitrogen, total [as N]MX MO AV <= 10 mg/L all year
MW7Nitrogen, Kjeldahl, total [as N]VALUE report only all year
MW7Phosphate, total [as PO4]VALUE report only all year
MW7ChlorideM0 <= 250 mg/L all year
MW7Solids, total dissolvedM0 <= 500 mg/L all year
MW7Nitrogen, nitrate total [as NO3]ANNL MAX <= 10 mg/L all year
MW7Nitrogen, nitrite total [as NO2]ANNL MAX <= 1 mg/L all year
MW7Coliform, fecal generalM0 <= 2 MPN/100mL all year
SUMNitrogen, total [as N]MO AVG report only all year
SUMNitrogen, total [as N]MO TOTAL report only all year
SUMNitrogen, total [as N]CUM TOTL 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