GROTON SCHOOL

NPDES permit MA0033324 · Minor NON-POTW · administratively continued, expires 2019-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2019-09-30 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

0values over a limit
0required values missing, on 0 form(s)
1of 12 forms filed late

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

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (31)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 18 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 26 lb/d all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 8.3 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedMO AVG <= 18 lb/d all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedWKLY AVG <= 26 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX report only Jun
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG <= .6 lb/d all year
001Hardness, total [as CaCO3]DAILY MX report only Jun
001Nickel, total recoverableDAILY MX report only Jun
001Zinc, total recoverableDAILY MX report only Jun
001Aluminum, total recoverableDAILY MX report only Jun
001Cadmium, total recoverableDAILY MX report only Jun
001Lead, total recoverableDAILY MX report only Jun
001Copper, total recoverableDAILY MX report only Jun
001E. coli, thermotol, MF, MTECMO GEO <= 126 CFU/100mL all year
001E. coli, thermotol, MF, MTECDAILY MX <= 409 CFU/100mL all year
001Flow, in conduit or thru treatment plantROLL AVG <= .07 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN >= 50 % Jun

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