Clean Water Act discharge permit · NPDES ME0100641
SOUTHWEST HARBOR WWTF, Southwest Harbor, ME: NPDES ME0100641 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 17Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
SOUTHWEST HARBOR WWTF, held by SOUTHWEST HARBOR WATER & SEWER DISTRICT, holds NPDES permit ME0100641, which discharges to Atlantic Ocean. EPA’s file records it issued January 1, 2015 and expiring December 31, 2019. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SOUTHWEST HARBOR WWTF |
|---|---|
| Permittee as filed | SOUTHWEST HARBOR WATER & SEWER DISTRICT |
| NPDES ID | ME0100641 |
| 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 | January 1, 2015 |
| Expiration date | December 31, 2019 |
| Address | Southwest Harbor, ME 04679 |
| Receiving water | Atlantic Ocean |
| Subwatershed | Mount Desert Frontal Drainages (HUC 010500021503) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 19Pollutants on file
- 17Under a numeric limit
- 19With a violation of any kind
- 8With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 1 | 50 | 18 | March 31, 2024 | 30% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 137 | 11 | September 30, 2016 | 338% over the limit |
| Solids, total suspended | 6 | 137 | 11 | September 30, 2016 | 99,999% over the limit |
| Solids, settleable | 1 | 25 | 4 | July 31, 2024 | 7,900% over the limit |
| pH | 2 | 45 | 3 | July 31, 2017 | |
| Coliform, fecal MF, MFC broth, 44.5 C | 2 | 21 | 3 | August 31, 2025 | 99,999% over the limit |
| Enterococci | 2 | 3 | 3 | August 31, 2025 | 99,999% over the limit |
| BOD, 5-day, percent removal | 1 | 23 | 1 | September 30, 2016 | 7% over the limit |
| Copper, total [as Cu] | 2 | 50 | 0 | ||
| Chlorine, total residual | 2 | 45 | 0 | ||
| Solids, suspended percent removal | 1 | 21 | 0 | ||
| NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulata | 2 | 8 | 0 | ||
| Analytical Chemistry | 2 | 7 | 0 | ||
| NOAEL Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 2 | 7 | 0 | ||
| Mercury, total [as Hg] | 2 | 4 | 0 | ||
| Priority Pollutants | 1 | 2 | 0 | ||
| Noael Static 48Hr Acute Mysid. Bahia | 1 | 2 | 0 | ||
| Noel Statre 7Day Chronic Menidia | 0 | 2 | 0 | ||
| NOAEL Static 48Hr Acute Menidia sp. | 0 | 2 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES ME0100641.
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.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, ME0100641.
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- One watershed — $2,990/year
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How we handle your data → Privacy
EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID ME0100641 there.
Nearby on the register
- Discharge permits in Southwest Harbor
- Every permit record in Southwest Harbor, A to Z
- Discharge permits in Maine
- Every permit record in Maine, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.