Clean Water Act discharge permit · NPDES MAG912279

7 HARTWELL AVENUE, Lexington, MA: NPDES MAG912279 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
44Pollutants under a numeric limit
0Pollutants with an effluent exceedance

7 HARTWELL AVENUE, held by Callahan, Inc., holds NPDES permit MAG912279. EPA’s file records it issued August 2, 2022 and expiring August 1, 2027. 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	7 HARTWELL AVENUE
Permittee as filed	Callahan, Inc.
NPDES ID	MAG912279
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	August 2, 2022
Expiration date	August 1, 2027
Issuing agency	EPA Region 1
Address	Lexington, MA 02421
Subwatershed	Upper Shawsheen River (HUC 010700061301)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

44Pollutants on file
44Under a numeric limit
44With a violation of any kind
0With 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
pH	2	8
Cyanide, total [as CN]	2	8
Chloride, total recoverable	2	8
Iron, total recoverable	2	8
Barium, total recoverable	2	8
Nickel, total recoverable	2	8
Zinc, total recoverable	2	8
Lead, total recoverable	2	8
Chromium, total recoverable	2	8
Copper, total recoverable	2	8
Vanadium, total recoverable	2	8
Acenaphthylene	2	8
Acenaphthene	2	8
Anthracene	2	8
Benzo[k]fluoranthene	2	8
Benzo[a]pyrene	2	8
Chrysene	2	8
Ethylbenzene	2	8
Fluoranthene	2	8
Fluorene	2	8
Indeno[1,2,3-cd]pyrene	2	8
Phenanthrene	2	8
Pyrene	2	8
Benzo[ghi]perylene	2	8
Benzo[a]anthracene	2	8
Dibenz[a,h]anthracene	2	8
Naphthalene	2	8
PCB-1254	2	8
PCB-1260	2	8
Mercury, total recoverable	2	8
1,2,4-Trimethylbenzene	2	8
Isopropylbenzene	2	8
n-Propylbenzene	2	8
1,3,5-Trimethylbenzene	2	8
Sec-butylbenzene	2	8
Xylene [mix of m+o+p]	2	8
Methyl ethyl ketone	2	8
Turbidity	1	4
Solids, total suspended	1	4
Nitrogen, total [as N]	1	4
Arsenic, total recoverable	1	4
Flow, in conduit or thru treatment plant	1	4
Solids, total dissolved [TDS]	1	4
Hydrocarbons, total petroleum	1	4

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MAG912279.

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 MAG912279.

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 MAG912279 there.

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES MAG912279, held by Callahan, Inc. for the facility at 7 HARTWELL AVENUE in Lexington, MA, in the Upper Shawsheen River subwatershed (HUC 010700061301). The permit is listed as Effective, a Minor Discharger class, with 44 pollutants on file, 44 under a numeric limit, 0 with an effluent exceedance, and 7 with a violation of any kind.