The Holden Arboretum

NPDES permit OH0140481 · Minor NON-POTW · effective, expires 2028-07-31 · 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)
1of 11 forms filed late

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

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (25)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L Mar, Jun, Aug, Dec
001pHDAILY MN >= 6.5 SU Mar, Jun, Aug, Dec
001pHDAILY MX <= 9 SU Mar, Jun, Aug, Dec
001Solids, total suspendedMO AVG <= 12 mg/L Mar, Jun, Aug, Dec
001Solids, total suspendedWKLY MAX <= 15 mg/L Mar, Jun, Aug, Dec
001Solids, total suspendedMO AVG <= .036 kg/d Mar, Jun, Aug, Dec
001Solids, total suspendedWKLY MAX <= .045 kg/d Mar, Jun, Aug, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1 mg/L Jun, Aug
001Nitrogen, ammonia total [as N]MO AVG <= 3 mg/L Mar, Dec
001Nitrogen, ammonia total [as N]WKLY MAX <= 1.5 mg/L Jun, Aug
001Nitrogen, ammonia total [as N]WKLY MAX <= 4.5 mg/L Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG <= .003 kg/d Jun, Aug
001Nitrogen, ammonia total [as N]MO AVG <= .0091 kg/d Mar, Dec
001Nitrogen, ammonia total [as N]WKLY MAX <= .0045 kg/d Jun, Aug
001Nitrogen, ammonia total [as N]WKLY MAX <= .0136 kg/d Mar, Dec
001Turbidity [severity]MO AVG report only all year
001Turbidity [severity]DAILY MX report only all year
001E. coli, MTEC-MFMO GEOMN <= 126 MPN/100mL Jun, Aug
001E. coli, MTEC-MFWK GEOMN <= 284 MPN/100mL Jun, Aug
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L Mar, Jun, Aug, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY MAX <= 15 mg/L Mar, Jun, Aug, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= .03 kg/d Mar, Jun, Aug, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY MAX <= .045 kg/d Mar, Jun, Aug, Dec

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