HORSHAM TWP WATER & SEW AUTH MONTGOMERY CNTY

NPDES permit PA0051985 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 15 forms filed late

Last period with anything received: 2026-06-30.

Reporting

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

Limits in force (85)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 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 <= 563 lb/d all year
001Solids, total suspendedWKLY AVG <= 844 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 2.1 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 39.4 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 75 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrite + Nitrate total [as N]MO AVG report only Jan, Feb, Mar, Apr, May, Jun, Nov, Dec
001Nitrite + Nitrate total [as N]MO AVG <= 8.9 mg/L Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only Jan, Feb, Mar, Apr, May, Jun, Nov, Dec
001Nitrite + Nitrate total [as N]MO AVG <= 167 lb/d Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG <= .6 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG <= 1.2 mg/L Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]MO AVG <= 11.1 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG <= 22.2 lb/d Jan, Feb, Mar, Nov, Dec
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Copper, total [as Cu]MO AVG report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Copper, total [as Cu]MO AVG report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Zinc, total [as Zn]QRTR AVG report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantWKLY AVG report only all year
001E. coliDAILY MX report only all year
001Ultraviolet light transmittanceDAILY MN report only all year
001Perfluorooctanoic acid (PFOA)MO AVG report only all year
001Perfluorooctanoic acid (PFOA)DAILY MX report only all year
001Perfluorooctanoic acid (PFOA)QRTR AVG report only all year
001Perfluorooctanoic acid (PFOA)DAILY MX report only all year
001PerfluorooctanesulfonateMO AVG report only all year
001PerfluorooctanesulfonateDAILY MX report only all year
001PerfluorooctanesulfonateQRTR AVG report only all year
001PerfluorooctanesulfonateDAILY MX report only all year
001Total PFOA and PFOSMO AVG report only all year
001Total PFOA and PFOSDAILY MX report only all year
001Total PFOA and PFOSQRTR AVG report only all year
001Total PFOA and PFOSDAILY MX report only all year
001Perfluorobutanesulfonic acid (PFBS)QRTR AVG report only all year
001Perfluorobutanesulfonic acid (PFBS)DAILY MX report only all year
001Hexafluoropropylene oxide dimer acid (HFPO-DA)QRTR AVG report only all year
001Hexafluoropropylene oxide dimer acid (HFPO-DA)DAILY MX report only all year
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX report only all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX report only all year
001Coliform, fecal generalGEO MEAN <= 200 #/100mL all year
001Coliform, fecal generalINST MAX <= 1000 #/100mL all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 20 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 375 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 187 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 563 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 281 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001TU Static 7Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001Static 7Day Chronic Pimephales PromelasDAILY MX report only all year
006Oxygen demand, chem. [high level] [COD]ANNL AVG report only all year
006Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
006pHANNL AVG report only all year
006pHDAILY MX report only all year
006Solids, total suspendedANNL AVG report only all year
006Solids, total suspendedDAILY MX report only all year
006Oil & GreaseANNL AVG report only all year
006Oil & GreaseDAILY MX report only all year
006Nitrogen, Kjeldahl, total [as N]ANNL AVG report only all year
006Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
006Phosphorus, total [as P]ANNL AVG report only all year
006Phosphorus, total [as P]DAILY MX report only all year
006Iron, dissolved [as Fe]ANNL AVG report only all year
006Iron, dissolved [as Fe]DAILY MX report only all year
006Coliform, fecal generalANNL AVG report only all year
006Coliform, fecal generalDAILY MX report only all year
006BOD, carbonaceous [5 day, 20 C]ANNL AVG report only all year
006BOD, carbonaceous [5 day, 20 C]DAILY MX 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