L.S. STARRETT COMPANY — NPDES permit MA0001350: limits, due date and EPA's record

NPDES permit MA0001350 · Major NON-POTW · administratively continued, expires 2026-07-31 · EPA's file as of 2026-09-19

This permit expired on 2026-07-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

Last period with anything received: 2026-07-31. Most often over: pH (4), LC50 Static 48Hr Acute Ceriodaphnia dubia (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (82)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. centigrade	DAILY MX	report only	Oct
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MAXIMUM	<= 8.3 SU	all year
002	pH	DAILY MX	report only	Oct
002	Solids, total suspended	MO AVG	<= 20 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
002	Oil & Grease	MO AVG	<= 15 mg/L	all year
002	Oil & Grease	DAILY MX	<= 15 mg/L	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	Oct
002	Cyanide, total [as CN]	MO AVG	<= .5 mg/L	all year
002	Cyanide, total [as CN]	DAILY MX	<= 1 mg/L	all year
002	Cyanide, free [amenable to chlorination]	MO AVG	<= .05 mg/L	all year
002	Cyanide, free [amenable to chlorination]	DAILY MX	<= .1 mg/L	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	Oct
002	Hardness, total [as CaCO3]	DAILY MX	report only	Oct
002	Cadmium, total [as Cd]	MO AVG	<= .068 mg/L	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	Oct
002	Cadmium, total [as Cd]	DAILY MX	<= .178 mg/L	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	Oct
002	Chromium, hexavalent [as Cr]	MO AVG	<= .05 mg/L	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	<= .1 mg/L	all year
002	Chromium, total [as Cr]	MO AVG	<= .5 mg/L	all year
002	Chromium, total [as Cr]	DAILY MX	<= 1 mg/L	all year
002	Copper, total [as Cu]	MO AVG	<= .79 mg/L	all year
002	Copper, total [as Cu]	DAILY MX	<= 1 mg/L	all year
002	Copper, total [as Cu]	DAILY MX	report only	Oct
002	Copper, total [as Cu]	DAILY MX	report only	Oct
002	Lead, total [as Pb]	MO AVG	<= .119 mg/L	all year
002	Lead, total [as Pb]	DAILY MX	report only	Oct
002	Lead, total [as Pb]	DAILY MX	<= .69 mg/L	all year
002	Lead, total [as Pb]	DAILY MX	report only	Oct
002	Nickel, total [as Ni]	MO AVG	<= 2.38 mg/L	all year
002	Nickel, total [as Ni]	DAILY MX	<= 3 mg/L	all year
002	Nickel, total [as Ni]	DAILY MX	report only	Oct
002	Nickel, total [as Ni]	DAILY MX	report only	Oct
002	Silver, total [as Ag]	MO AVG	<= .026 mg/L	all year
002	Silver, total [as Ag]	DAILY MX	<= .082 mg/L	all year
002	Zinc, total [as Zn]	MO AVG	<= 1.48 mg/L	all year
002	Zinc, total [as Zn]	DAILY MX	<= 2 mg/L	all year
002	Zinc, total [as Zn]	DAILY MX	report only	Oct
002	Zinc, total recoverable	DAILY MX	report only	Oct
002	Aluminum, total [as Al]	MO AVG	<= 1 mg/L	all year
002	Aluminum, total [as Al]	DAILY MX	<= 2 mg/L	all year
002	Aluminum, total [as Al]	DAILY MX	report only	Oct
002	Aluminum, total [as Al]	DAILY MX	report only	Oct
002	Trichloroethylene	DAILY MX	<= .005 mg/L	all year
002	Flow, in conduit or thru treatment plant	MO AVG	<= 25000 gal/d	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 30000 gal/d	all year
002	Chlorine, total residual	MO AVG	<= .7 mg/L	all year
002	Chlorine, total residual	DAILY MX	<= 1 mg/L	all year
002	Organics, total toxic [TTO]	DAILY MX	<= 2.13 mg/L	all year
002	LC50 Static 48Hr Acute Ceriodaphnia dubia	DAILY MN	>= 50 %	Oct
002	LC50 Static 48Hr Acute Pimephales promelas	DAILY MN	>= 50 %	Oct
002	NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia	DAILY MN	report only	Oct
002	Noel Statre 7Day Chronic Pimephales	DAILY MN	report only	Oct
003	Cyanide, total [as CN]	MO AVG	<= .65 mg/L	all year
003	Cyanide, total [as CN]	DAILY MX	<= 1.2 mg/L	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
004	Temperature, water deg. fahrenheit	DAILY MX	<= 83 deg F	all year
004	pH	MINIMUM	>= 6.5 SU	all year
004	pH	MAXIMUM	<= 8.3 SU	all year
004	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
004	Flow, in conduit or thru treatment plant	DAILY MX	<= 7200 gal/d	all year
005	Temperature, water deg. fahrenheit	DAILY MX	<= 83 deg F	all year
005	pH	MINIMUM	>= 6.5 SU	all year
005	pH	MAXIMUM	<= 8.3 SU	all year
005	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
005	Flow, in conduit or thru treatment plant	DAILY MX	<= 20000 gal/d	all year
007	Temperature, water deg. fahrenheit	DAILY MX	<= 83 deg F	all year
007	pH	MINIMUM	>= 6.5 SU	all year
007	pH	MAXIMUM	<= 8.3 SU	all year
007	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
007	Flow, in conduit or thru treatment plant	DAILY MX	<= 98200 gal/d	all year
PFAS	Perfluorooctanoic acid (PFOA)	DAILY MX	report only	all year
PFAS	Perfluoroheptanoic acid (PFHpA)	DAILY MX	report only	all year
PFAS	Perfluorononanoic acid (PFNA)	DAILY MX	report only	all year
PFAS	Perfluorodecanoic acid (PFDA)	DAILY MX	report only	all year
PFAS	Perfluorohexanesulfonic acid (PFHxS)	DAILY MX	report only	all year
PFAS	Perfluorooctanesulfonic acid (PFOS)	DAILY MX	report only	all year
SUM	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
SUM	Flow, in conduit or thru treatment plant	DAILY MX	<= 98200 gal/d	all year