MERCER BORO MERCER CNTY

NPDES permit PA0025356 · Major POTW · administratively continued, expires 2026-06-30 · 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 2026-06-30 and is administratively continued: 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

1values over a limit
39required values missing, on 2 form(s)
0of 14 forms filed late

Last period with anything received: 2026-06-30. Most often over: Solids, total suspended (1).

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 (43)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 4 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
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 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 <= 392 lb/d all year
001Solids, total suspendedWKLY AVG <= 588 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 2.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 7.5 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 32.7 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 98 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Phosphorus, total [as P]MO AVG report only all year
001Cadmium, total [as Cd]MO AVG report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Cadmium, total [as Cd]MO AVG report only all year
001Cadmium, total [as Cd]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]MO AVG <= .18 mg/L all year
001Zinc, total [as Zn]DAILY MX <= .28 mg/L all year
001Zinc, total [as Zn]MO AVG <= 2.42 lb/d all year
001Zinc, total [as Zn]DAILY MX <= 3.78 lb/d all year
001Ultraviolet light intensityMO 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
001E. coliINST MAX report only all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 3.22 tox chronic all year
001Coliform, fecal generalGEO MEAN <= 2000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Coliform, fecal generalGEO MEAN <= 200 #/100mL May, Jun, Jul, Aug, Sep
001Coliform, fecal generalINST MAX <= 10000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Coliform, fecal generalINST MAX <= 1000 #/100mL May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 131 lb/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 196 lb/d all year
001Static 7Day Chronic Pimephales PromelasDAILY MX <= 3.22 tox chronic 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