Clean Water Act discharge permit · NPDES MA0005517

POTTER STATION UNIT 2, Braintree, MA: NPDES MA0005517 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
5Pollutants under a numeric limit
4Pollutants with an effluent exceedance

POTTER STATION UNIT 2 holds NPDES permit MA0005517, which discharges to Weymouth Fore River. EPA’s file records it issued March 20, 2000 and expiring March 31, 2005. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	POTTER STATION UNIT 2
Permittee as filed	POTTER STATION UNIT 2
NPDES ID	MA0005517
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	March 20, 2000
Expiration date	March 31, 2005
Address	Braintree, MA 02184
Receiving water	WEYMOUTH FORE RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Monatiquot River-Frontal Quincy Bay (HUC 010900010901)
Other EPA IDs (FRS)	RCRA handler MAD980734578; ICIS-AIR source MA0000002511900491

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

10Pollutants on file
5Under a numeric limit
10With 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
Solids, total suspended	2	13	9	January 31, 2014	290% over the limit
pH	2	17	5	April 30, 2026
Flow, in conduit or thru treatment plant	2	13	2	October 31, 2011	32,712,400% over the limit
Oxidants, total residual	0	2	2	June 30, 2020	50% over the limit
Oil & Grease	2	10	0
Chlorine, total residual	2	10	0
Xylene [mix of m+o+p]	0	4	0
Iron, total recoverable	0	2	0
Toluene	0	2	0
Ethylbenzene	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 MA0005517.

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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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 MA0005517 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

POTTER STATION UNIT 2 holds NPDES permit MA0005517 for a discharge to the Weymouth Fore River in Braintree, MA, with the permit listed as administratively continued after its March 31, 2005 expiration date. The page lists 5 pollutants under a numeric limit and 4 pollutants with an effluent exceedance, with the facility classed as a minor discharger.