Clean Water Act discharge permit · NPDES OH0026743
NILES WWTP, Niles, OH: NPDES OH0026743 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 42Pollutants under a numeric limit
- 12Pollutants with an effluent exceedance
NILES WWTP, held by Niles, City of, holds NPDES permit OH0026743, which discharges to Mahoning River. EPA’s file records it issued November 15, 2017 and expiring November 30, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | NILES WWTP |
|---|---|
| Permittee as filed | Niles, City of |
| NPDES ID | OH0026743 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 15, 2017 |
| Expiration date | November 30, 2022 |
| Address | Niles, OH 44446 |
| Receiving water | Mahoning River |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Little Squaw Creek-Mahoning River (HUC 050301030705) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 45Pollutants on file
- 42Under a numeric limit
- 38With a violation of any kind
- 12With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 10 | 38 | 20 | December 31, 2023 | 80% over the limit |
| Solids, total suspended | 12 | 37 | 19 | May 31, 2026 | 318% over the limit |
| Mercury, total low level | 6 | 27 | 11 | January 31, 2017 | 131% over the limit |
| E. coli, MTEC-MF | 8 | 8 | 8 | August 31, 2024 | 99,999% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 12 | 24 | 6 | April 30, 2026 | 48% over the limit |
| Lead, total recoverable | 8 | 21 | 5 | December 31, 2021 | 35% over the limit |
| Coliform, fecal MF, MFC broth, 44.5 C | 0 | 5 | 5 | June 30, 2006 | 725% over the limit |
| Oil & Grease | 0 | 4 | 4 | November 30, 2007 | 60% over the limit |
| Oil and grease, hexane extr method | 2 | 6 | 3 | August 31, 2018 | 894% over the limit |
| Nitrogen, ammonia total [as N] | 14 | 20 | 2 | August 31, 2022 | 61% over the limit |
| Chlorine, total residual | 4 | 2 | 2 | July 31, 2004 | 1,742% over the limit |
| pH, minimum | 3 | 7 | 1 | December 31, 2002 | |
| Temperature, water deg. centigrade | 8 | 18 | 0 | ||
| Nitrite + Nitrate total [as N] | 8 | 18 | 0 | ||
| Nickel, total recoverable | 6 | 16 | 0 | ||
| Zinc, total recoverable | 6 | 16 | 0 | ||
| Cadmium, total recoverable | 6 | 16 | 0 | ||
| Chromium, total recoverable | 6 | 16 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 6 | 16 | 0 | ||
| Copper, total recoverable | 6 | 14 | 0 | ||
| pH | 4 | 12 | 0 | ||
| Cyanide, free-water plus wastewaters | 0 | 12 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 8 | 10 | 0 | ||
| Oxygen, dissolved [DO] | 4 | 9 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 6 | 0 | ||
| Solids, total dissolved- 180 deg. C | 4 | 6 | 0 | ||
| pH, maximum | 3 | 6 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 6 | 0 | ||
| Di[2-ethylhexyl] phthalate [DEHP] | 6 | 4 | 0 | ||
| Cyanide, free available | 6 | 4 | 0 | ||
| Overflows | 2 | 4 | 0 | ||
| Phosphate, ortho, dissolved [as P] | 4 | 2 | 0 | ||
| Biosolids weight indluding admixtures | 2 | 2 | 0 | ||
| Sludge weight, dry | 2 | 2 | 0 | ||
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | 2 | 2 | 0 | ||
| %Effect Static Renewal 96Hr Acute Pimephales promelas | 2 | 2 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| %Effect Static Renewal 7Day Chronic Pimephales promelas | 2 | 2 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 4 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 4 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 4 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 4 | 0 | 0 | ||
| Bypass Volume | 2 | 0 | 0 | ||
| Bypass valve | 2 | 0 | 0 | ||
| Bypass of treatment | 2 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 28, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| March 24, 2020 | Effluent Violations - Unauthorized Discharge | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.