Clean Water Act discharge permit · NPDES ME0101851

STONINGTON SD WWTF, Stonington, ME: NPDES ME0101851 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
10Pollutants under a numeric limit
4Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

STONINGTON SD WWTF, held by STONINGTON SANITARY DISTRICT, holds NPDES permit ME0101851, which discharges to Deer Isle Thoroughfare. EPA’s file records it issued April 1, 2019 and expiring March 31, 2024.

STONINGTON SD WWTF, Stonington, Maine: Individual permit ME0101851, held by STONINGTON SANITARY DISTRICT; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued April 1, 2019, term to March 31, 2024; discharges to Deer Isle Thoroughfare.

Coliform, fecal MF, MFC broth, 44.5 C: 0 limits, 26 violations of any kind, 8 effluent exceedances, latest July 31, 2011, largest 99,999% over the limit.
Fecal coliform, MPN, EC med, 44.5 C: 4 limits, 5 violations of any kind, 3 effluent exceedances, latest March 31, 2025, largest 99,999% over the limit.
pH: 8 limits, 47 violations of any kind, 1 effluent exceedance, latest November 30, 2018.
Chlorine, total residual: 2 limits, 11 violations of any kind, 1 effluent exceedance, latest July 31, 2011, largest 260% over the limit.
Solids, total suspended: 8 limits, 92 violations of any kind, 0 effluent exceedances.
BOD, 5-day, 20 deg. C: 8 limits, 91 violations of any kind, 0 effluent exceedances.
Solids, settleable: 6 limits, 46 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 4 limits, 26 violations of any kind, 0 effluent exceedances.
Enterococci: 4 limits, 2 violations of any kind, 0 effluent exceedances.
BOD, percent removal [total]: 2 limits, 1 violation of any kind, 0 effluent exceedances.
Solids, suspended percent removal: 2 limits, 1 violation of any kind, 0 effluent exceedances.

Maine holds 116 Publicly owned treatment works coverages of this permit type in EPA’s file; 111 were issued before ME0101851.

Coverages issued nearest ME0101851

October 1, 2018: MERE PT COLONY SUBSURFACE W, Brunswick, MEU508015, held by BRUNSWICK TOWN OF
November 1, 2018: RANGELEY WWTF, Rangeley, MEU508086, held by RANGELEY TOWN OF
January 1, 2019: PATTEN WWTF, Patten, MEU507775, held by PATTEN TOWN OF
January 1, 2019: MAPLETON SEWER DISTRICT, Mapleton, MEU508147
April 1, 2019: NORTHPORT VILLAGE CORP., Northport, ME0100901, held by NORTHPORT VILLAGE CORPORATION
April 1, 2019: LUBEC WWTF, Lubec, ME0102016, held by LUBEC TOWN OF
June 1, 2022: SUBSURFACE WASTEWATER TRTMNT DISCHARGE, Bridgton, MEU508273, held by TOWN OF BRIDGTON
June 1, 2023: PWD-NORTH WINDHAM WWTF, Windham, MEU508276, held by PORTLAND WATER DISTRICT

STONINGTON SD WWTF among its neighbors

EPA’s permit file holds 1 discharge permits in the Islands of Stonington Frontal Drainages subwatershed (HUC 010500021702), ME0101851 among them. Its county holds 42, 1 of them major permits; ME0101851 is a minor permit.

Identity

Facility as filed	STONINGTON SD WWTF
Permittee as filed	STONINGTON SANITARY DISTRICT
NPDES ID	ME0101851
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	April 1, 2019
Expiration date	March 31, 2024
Address	Stonington, ME 04681
Receiving water	Deer Isle Thoroughfare
Subwatershed	Islands of Stonington Frontal Drainages (HUC 010500021702)
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

11Pollutants on file
10Under a numeric limit
11With a violation of any kind
4With 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
Coliform, fecal MF, MFC broth, 44.5 C	0	26	8	July 31, 2011	99,999% over the limit
Fecal coliform, MPN, EC med, 44.5 C	4	5	3	March 31, 2025	99,999% over the limit
pH	8	47	1	November 30, 2018
Chlorine, total residual	2	11	1	July 31, 2011	260% over the limit
Solids, total suspended	8	92	0
BOD, 5-day, 20 deg. C	8	91	0
Solids, settleable	6	46	0
Flow, in conduit or thru treatment plant	4	26	0
Enterococci	4	2	0
BOD, percent removal [total]	2	1	0
Solids, suspended percent removal	2	1	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES ME0101851.

Inspections

EPA’s inspection file holds no inspection for NPDES ME0101851.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES ME0101851.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers NPDES permit ME0101851, held by STONINGTON SANITARY DISTRICT for the STONINGTON SD WWTF in Stonington, ME, which discharges to Deer Isle Thoroughfare and is listed as administratively continued with a Minor Discharger class. The page lists 10 pollutants under a numeric limit and 4 pollutants with an effluent exceedance.