Watershed Quality Assessment Report | WATERS

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Assessment Summary
Causes of Impairment
Probable Sources Contributing to Impairment
TMDL Alternatives by Cause of Impairment
Cumulative TMDLs by Pollutant

Massachusetts State Report

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Massachusetts, Concord Watershed

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Assessment Summary for Reporting Year 2010
Massachusetts, Concord Watershed

Description of this table
Click here to list Threatened and Impaired Waters Only

Waterbody Name	Waterbody ID	Location	Map	Waterbody Type	Size	Units	Status	State TMDL Development Status
NOTE: Click on the underlined "Waterbody Name" to view a Waterbody report.
Ashland Reservoir	MA82003	Ashland	Waterbody Map	Freshwater Lake	168.0	Acres	Impaired	TMDL needed
Assabet River	MA82B-01	Outlet Of The Assabet River Reservoir, Westborough To The Westborough Wwtp Discharge, Westborough.	Waterbody Map	River	1.2	Miles	Impaired	TMDL needed
Assabet River	MA82B-02	From The Westborough Wwtp Discharge, Westborough To The Route 20 Dam, Northborough.	Waterbody Map	River	3.8	Miles	Impaired	TMDL needed
Assabet River	MA82B-03	From The Route 20 Dam, Northborough To The Marlborough West Wwtp Discharge, Marlborough.	Waterbody Map	River	2.4	Miles	Impaired	TMDL needed
Assabet River	MA82B-04	From The Marlborough West Wwtp Discharge, Marlborough To The Hudson Wwtp Discharge, Hudson.	Waterbody Map	River	8.0	Miles	Impaired	TMDL needed
Assabet River	MA82B-05	From The Hudson Wwtp Discharge, Hudson To The Usgs Gage At Routes 27/62, Maynard.	Waterbody Map	River	8.2	Miles	Impaired	TMDL needed
Assabet River	MA82B-06	From The Usgs Gage At Routes 27/62, Maynard To The Powdermill Dam, Acton.	Waterbody Map	River	1.2	Miles	Impaired	TMDL needed
Assabet River	MA82B-07	From The Powdermill Dam, Acton To The Confluence With The Sudbury River, Concord.	Waterbody Map	River	6.4	Miles	Impaired	TMDL needed
Assabet River Reservoir	MA82004	Westborough	Waterbody Map	Freshwater Lake	338.1	Acres	Impaired	TMDL needed
Bartlett Pond	MA82007	Northborough	Waterbody Map	Freshwater Lake	51.8	Acres	Impaired	Non-pollutant impairment
Batemans Pond	MA82008	Concord	Waterbody Map	Freshwater Lake	25.7	Acres	Impaired	Non-pollutant impairment
Boons Pond	MA82011	Stow/Hudson	Waterbody Map	Freshwater Lake	173.4	Acres	Impaired	TMDL completed
Carding Mill Pond	MA82015	Sudbury	Waterbody Map	Freshwater Lake	40.5	Acres	Impaired	TMDL needed
Chauncy Lake	MA82017	Westborough	Waterbody Map	Freshwater Lake	173.3	Acres	Impaired	Non-pollutant impairment
Clamshell Pond	MA82018	Clinton	Waterbody Map	Freshwater Lake	24.3	Acres	Not_Assessed
Concord River	MA82A-07	From The Confluence Of The Assabet And Sudbury Rivers, Concord To The Billerica Water Supply Intake, Billerica.	Waterbody Map	River	10.4	Miles	Impaired	TMDL needed
Concord River	MA82A-08	From The Billerica Water Supply Intake, Billerica To Rogers Street Bridge, Lowell.	Waterbody Map	River	5.1	Miles	Impaired	TMDL needed
Concord River	MA82A-09	From The Rogers Street Bridge, Lowell To The Confluence With The Merrimack River, Lowell.	Waterbody Map	River	.9	Miles	Impaired	TMDL needed
Dudley Pond	MA82029	Wayland	Waterbody Map	Freshwater Lake	83.2	Acres	Impaired	TMDL needed
Eames Brook	MA82A-13	From The Outlet Of Farm Pond, Framingham To The Confluence With The Sudbury River, Framingham.	Waterbody Map	River	.6	Miles	Impaired	TMDL needed
Elizabeth Brook	MA82B-12	From The Outlet Of An Unnamed Pond (Delaney Project On Stow/Harvard Border) West Of Harvard Road, Stow To The Inlet Of Fletchers Pond, Stow.	Waterbody Map	River	3.7	Miles	Impaired	TMDL needed
Elm Street Pond	MA82032	Chelmsford/Carlisle	Waterbody Map	Freshwater Lake	65.6	Acres	Not_Assessed
Farm Pond	MA82035	Framingham	Waterbody Map	Freshwater Lake	139.7	Acres	Impaired	TMDL needed
Farrar Pond	MA82036	Lincoln	Waterbody Map	Freshwater Lake	83.0	Acres	Not_Assessed
Fisk Pond	MA82038	Natick	Waterbody Map	Freshwater Lake	61.8	Acres	Impaired	Non-pollutant impairment
Fiske Street Pond	MA82037	Carlisle/Chelmsford	Waterbody Map	Freshwater Lake	37.7	Acres	Not_Assessed
Fort Meadow Brook	MA82B-11	Outlet Of Fort Meadow Reservoir, Marlborough/Hudson To Confluence With Assabet River, Hudson.	Waterbody Map	River	2.7	Miles	Good
Fort Meadow Reservoir	MA82042	Marlborough/Hudson	Waterbody Map	Freshwater Lake	254.0	Acres	Impaired	TMDL needed
Fort Pond	MA82043	Littleton	Waterbody Map	Freshwater Lake	101.8	Acres	Not_Assessed
Fort Pond Brook	MA82B-13	From Source In A Wetland Just West Of Fort Pond, Littleton To The Inlet Of Warners Pond, Concord.	Waterbody Map	River	10.2	Miles	Not_Assessed
Framingham Reservoir #1	MA82044	Framingham	Waterbody Map	Freshwater Lake	117.6	Acres	Impaired	TMDL needed
Framingham Reservoir #2	MA82045	Framingham/Ashland	Waterbody Map	Freshwater Lake	114.4	Acres	Impaired	TMDL needed
Framingham Reservoir #3	MA82046	Framingham	Waterbody Map	Freshwater Lake	221.2	Acres	Impaired	Non-pollutant impairment
Gates Pond	MA82047	Berlin	Waterbody Map	Freshwater Lake	72.7	Acres	Not_Assessed
Gates Pond Brook	MA82B-10	From The Outlet Of Gates Pond, Berlin To The Confluence With The Assabet River, Berlin.	Waterbody Map	River	1.0	Miles	Not_Assessed
Gleasons Pond	MA82048	Framingham	Waterbody Map	Freshwater Lake	10.5	Acres	Not_Assessed
Great Meadows Pond #3	MA82053	Concord	Waterbody Map	Freshwater Lake	53.0	Acres	Impaired	Non-pollutant impairment
Grist Mill Pond	MA82055	Sudbury/Marlborough	Waterbody Map	Freshwater Lake	16.7	Acres	Impaired	TMDL needed
Hager Pond	MA82056	Marlborough	Waterbody Map	Freshwater Lake	29.9	Acres	Impaired	TMDL needed
Heard Pond	MA82058	Wayland	Waterbody Map	Freshwater Lake	75.6	Acres	Impaired	TMDL needed
Heart Pond	MA82059	Chelmsford/Westford	Waterbody Map	Freshwater Lake	93.9	Acres	Impaired	TMDL needed
Hocomonco Pond	MA82060	Westborough	Waterbody Map	Freshwater Lake	26.9	Acres	Impaired	TMDL needed
Hop Brook	MA82A-05	Outlet Of Carding Mill Pond, Sudbury To Confluence With Allowance Brook, Sudbury (Allowance Brook Was Identified As Landham Brook On Usgs Quads Prior To 1987).	Waterbody Map	River	6.7	Miles	Impaired	TMDL needed
Hop Brook	MA82A-06	From The Confluence Of Allowance Brook, Sudbury To The Confluence With The Sudbury River, Wayland (This Segment Was Formerly Identified As Wash Brook, Hop Brook Appeared As Wash Brook And Allowance Brook Was Previously Identified As Landham Brook On Usgs Quads Prior To 1987).	Waterbody Map	River	3.0	Miles	Impaired	TMDL needed
Hopkinton Reservoir	MA82061	Hopkinton/Ashland	Waterbody Map	Freshwater Lake	161.1	Acres	Impaired	TMDL needed
Ice House Pond	MA82066	Acton	Waterbody Map	Freshwater Lake	11.2	Acres	Not_Assessed
Lake Cochituate	MA82020	[North Basin] Natick/Framingham/Wayland	Waterbody Map	Freshwater Lake	195.6	Acres	Impaired	TMDL needed
Lake Cochituate	MA82125	[Middle Basin] Natick/Wayland	Waterbody Map	Freshwater Lake	134.5	Acres	Impaired	TMDL needed
Lake Cochituate	MA82126	[Carling Basin] Natick	Waterbody Map	Freshwater Lake	14.3	Acres	Impaired	TMDL needed
Lake Cochituate	MA82127	[South Basin] Natick	Waterbody Map	Freshwater Lake	239.6	Acres	Impaired	TMDL needed
Learned Pond	MA82069	Framingham	Waterbody Map	Freshwater Lake	33.9	Acres	Not_Assessed
Little Chauncy Pond	MA82070	Northborough	Waterbody Map	Freshwater Lake	43.3	Acres	Impaired	Non-pollutant impairment
Long Pond	MA82072	Littleton	Waterbody Map	Freshwater Lake	101.7	Acres	Impaired	TMDL needed
Meadow Pond	MA82129	Carlisle	Waterbody Map	Freshwater Lake	12.4	Acres	Impaired	Non-pollutant impairment
Milham Reservoir	MA82077	Marlborough	Waterbody Map	Freshwater Lake	66.6	Acres	Not_Assessed
Mill Brook	MA82A-20	From The Outlet Of Crosby Pond, Concord To The Confluence With The Concord River, Concord.	Waterbody Map	River	2.7	Miles	Impaired	Non-pollutant impairment
Nagog Pond	MA82082	Littleton/Acton	Waterbody Map	Freshwater Lake	277.7	Acres	Not_Assessed
Nashoba Brook	MA82B-14	From Source Just South Of Route 110 In Westford To Confluence With Fort Pond Brook, Concord.	Waterbody Map	River	9.4	Miles	Impaired	TMDL needed
Nutting Lake	MA82088	[East Basin] Billerica	Waterbody Map	Freshwater Lake	30.5	Acres	Impaired	TMDL needed
Nutting Lake	MA82124	[West Basin] Billerica	Waterbody Map	Freshwater Lake	51.4	Acres	Impaired	TMDL completed
Pantry Brook	MA82A-19	From Source West Of Haynes Road, Sudbury To The Confluence With The Sudbury River, Sudbury.	Waterbody Map	River	3.2	Miles	Impaired	TMDL needed
Pine Brook	MA82A-14	From Source South Of Route 20, Just East Of The Weston/Wayland Border To The Confluence With The Sudbury River, Wayland.	Waterbody Map	River	2.5	Miles	Good
Puffers Pond	MA82092	Maynard/Sudbury	Waterbody Map	Freshwater Lake	28.4	Acres	Impaired	TMDL needed
River Meadow Brook	MA82A-10	From The Outlet Of Russell Mill Pond, Chelmsford To The Confluence With The Concord River, Lowell.	Waterbody Map	River	6.4	Miles	Impaired	TMDL needed
Rocky Pond	MA82095	Boylston	Waterbody Map	Freshwater Lake	61.8	Acres	Impaired	Non-pollutant impairment
Russell Millpond	MA82096	Chelmsford	Waterbody Map	Freshwater Lake	32.9	Acres	Impaired	Non-pollutant impairment
Saxonville Pond	MA82097	Framingham	Waterbody Map	Freshwater Lake	58.8	Acres	Impaired	TMDL needed
Second Division Brook	MA82B-09	From The Headwaters At The Outlet Of Small Unnamed Pond North Of Waltham Street, Maynard To The Confluence With The Assabet River, Concord.	Waterbody Map	River	2.9	Miles	Not_Assessed
Smith Pond	MA82099	Northborough	Waterbody Map	Freshwater Lake	15.6	Acres	Not_Assessed
Solomon Pond	MA82100	Northborough	Waterbody Map	Freshwater Lake	21.2	Acres	Not_Assessed
Spencer Brook	MA82B-15	From The Outlet Of An Unnamed Pond North Of Bellows Hill, Carlisle To The Inlet Of Angiers Pond, Concord.	Waterbody Map	River	3.8	Miles	Not_Assessed
Stearns Mill Pond	MA82104	Sudbury	Waterbody Map	Freshwater Lake	19.1	Acres	Impaired	TMDL needed
Sudbury Reservoir	MA82106	Southborough/Marlborough	Waterbody Map	Freshwater Lake	1,178.0	Acres	Impaired	TMDL completed
Sudbury River	MA82A-01	From The Source At The Outlet Of Cedar Swamp Pond, Westborough To The Fruit Street Bridge, Hopkinton/Westborough.	Waterbody Map	River	1.9	Miles	Not_Assessed
Sudbury River	MA82A-03	Outlet Saxonville Pond, Framingham To Confluence With Hop Brook (The Lower Portion Of Hop Brook Was Identified As Wash Brook On Usgs Quads Prior To 1987), Wayland.	Waterbody Map	River	5.5	Miles	Impaired	TMDL needed
Sudbury River	MA82A-04	Confluence With Hop Brook (The Lower Portion Of Hop Brook Was Identified As Wash Brook On Usgs Quads Prior To 1987), Wayland To Confluence With Assabet River, Concord.	Waterbody Map	River	11.7	Miles	Impaired	TMDL needed
Taylor Brook	MA82B-08	From The Outlet Of Puffer Pond, Maynard To The Confluence With The Assabet River, Maynard.	Waterbody Map	River	1.8	Miles	Good
Tripp Pond	MA82107	Hudson	Waterbody Map	Freshwater Lake	3.5	Acres	Not_Assessed
Unnamed Tributary	MA82A-16	From The Outlet Of Hager Pond, Marlborough To The Inlet Of Grist Mill Pond, Marlborough.	Waterbody Map	River	.2	Miles	Impaired	TMDL needed
Unnamed Tributary	MA82A-17	From The Outlet Of Grist Mill Pond, Sudbury To The Inlet Of Carding Mill Pond, Sudbury.	Waterbody Map	River	.5	Miles	Impaired	TMDL needed
Unnamed Tributary	MA82A-21	From The Outlet Of Heart Pond, Chelmsford To The Inlet Of Russell Millpond, Chelmsford.	Waterbody Map	River	4.1	Miles	Good
Unnamed Tributary	MA82B-16	From The Outlet Of Angiers Pond, Concord To Confluence With The Assabet River, Concord (This Segment Is Locally Known As Part Of Spencer Brook).	Waterbody Map	River	.5	Miles	Good
Walden Pond	MA82109	Concord	Waterbody Map	Freshwater Lake	62.9	Acres	Impaired	TMDL completed
Warners Pond	MA82110	Concord	Waterbody Map	Freshwater Lake	59.3	Acres	Impaired	TMDL completed
Waushakum Pond	MA82112	Framingham/Ashland	Waterbody Map	Freshwater Lake	87.2	Acres	Impaired	TMDL needed
West Pond	MA82115	Bolton	Waterbody Map	Freshwater Lake	19.0	Acres	Good
Westborough Reservoir	MA82114	Westborough	Waterbody Map	Freshwater Lake	41.0	Acres	Not_Assessed
White Pond	MA82118	Concord	Waterbody Map	Freshwater Lake	36.1	Acres	Not_Assessed
White Pond	MA82119	Hudson/Stow	Waterbody Map	Freshwater Lake	48.8	Acres	Not_Assessed
Whitehall Brook	MA82A-11	From The Outlet Of Whitehall Reservoir, Hopkinton To Confluence With The Sudbury River, Westborough.	Waterbody Map	River	3.5	Miles	Not_Assessed
Whitehall Reservoir	MA82120	Hopkinton	Waterbody Map	Freshwater Lake	559.6	Acres	Impaired	TMDL needed
Williams Lake	MA82121	Marlborough	Waterbody Map	Freshwater Lake	69.3	Acres	Not_Assessed
Willis Pond	MA82122	Sudbury	Waterbody Map	Freshwater Lake	67.3	Acres	Good
Winning Pond	MA82123	Billerica	Waterbody Map	Freshwater Lake	22.2	Acres	Impaired	Non-pollutant impairment

Description of this table
Click here to list All Assessed Waters

Waterbody Name	Waterbody ID	Location	Map	Waterbody Type	Size	Units	Status	State TMDL Development Status
NOTE: Click on the underlined "Waterbody Name" to view a Waterbody report.
Ashland Reservoir	MA82003	Ashland	Waterbody Map	Freshwater Lake	168.0	Acres	Impaired	TMDL needed
Assabet River	MA82B-01	Outlet Of The Assabet River Reservoir, Westborough To The Westborough Wwtp Discharge, Westborough.	Waterbody Map	River	1.2	Miles	Impaired	TMDL needed
Assabet River	MA82B-02	From The Westborough Wwtp Discharge, Westborough To The Route 20 Dam, Northborough.	Waterbody Map	River	3.8	Miles	Impaired	TMDL needed
Assabet River	MA82B-03	From The Route 20 Dam, Northborough To The Marlborough West Wwtp Discharge, Marlborough.	Waterbody Map	River	2.4	Miles	Impaired	TMDL needed
Assabet River	MA82B-04	From The Marlborough West Wwtp Discharge, Marlborough To The Hudson Wwtp Discharge, Hudson.	Waterbody Map	River	8.0	Miles	Impaired	TMDL needed
Assabet River	MA82B-05	From The Hudson Wwtp Discharge, Hudson To The Usgs Gage At Routes 27/62, Maynard.	Waterbody Map	River	8.2	Miles	Impaired	TMDL needed
Assabet River	MA82B-06	From The Usgs Gage At Routes 27/62, Maynard To The Powdermill Dam, Acton.	Waterbody Map	River	1.2	Miles	Impaired	TMDL needed
Assabet River	MA82B-07	From The Powdermill Dam, Acton To The Confluence With The Sudbury River, Concord.	Waterbody Map	River	6.4	Miles	Impaired	TMDL needed
Assabet River Reservoir	MA82004	Westborough	Waterbody Map	Freshwater Lake	338.1	Acres	Impaired	TMDL needed
Bartlett Pond	MA82007	Northborough	Waterbody Map	Freshwater Lake	51.8	Acres	Impaired	Non-pollutant impairment
Batemans Pond	MA82008	Concord	Waterbody Map	Freshwater Lake	25.7	Acres	Impaired	Non-pollutant impairment
Boons Pond	MA82011	Stow/Hudson	Waterbody Map	Freshwater Lake	173.4	Acres	Impaired	TMDL completed
Carding Mill Pond	MA82015	Sudbury	Waterbody Map	Freshwater Lake	40.5	Acres	Impaired	TMDL needed
Chauncy Lake	MA82017	Westborough	Waterbody Map	Freshwater Lake	173.3	Acres	Impaired	Non-pollutant impairment
Concord River	MA82A-07	From The Confluence Of The Assabet And Sudbury Rivers, Concord To The Billerica Water Supply Intake, Billerica.	Waterbody Map	River	10.4	Miles	Impaired	TMDL needed
Concord River	MA82A-08	From The Billerica Water Supply Intake, Billerica To Rogers Street Bridge, Lowell.	Waterbody Map	River	5.1	Miles	Impaired	TMDL needed
Concord River	MA82A-09	From The Rogers Street Bridge, Lowell To The Confluence With The Merrimack River, Lowell.	Waterbody Map	River	.9	Miles	Impaired	TMDL needed
Dudley Pond	MA82029	Wayland	Waterbody Map	Freshwater Lake	83.2	Acres	Impaired	TMDL needed
Eames Brook	MA82A-13	From The Outlet Of Farm Pond, Framingham To The Confluence With The Sudbury River, Framingham.	Waterbody Map	River	.6	Miles	Impaired	TMDL needed
Elizabeth Brook	MA82B-12	From The Outlet Of An Unnamed Pond (Delaney Project On Stow/Harvard Border) West Of Harvard Road, Stow To The Inlet Of Fletchers Pond, Stow.	Waterbody Map	River	3.7	Miles	Impaired	TMDL needed
Farm Pond	MA82035	Framingham	Waterbody Map	Freshwater Lake	139.7	Acres	Impaired	TMDL needed
Fisk Pond	MA82038	Natick	Waterbody Map	Freshwater Lake	61.8	Acres	Impaired	Non-pollutant impairment
Fort Meadow Reservoir	MA82042	Marlborough/Hudson	Waterbody Map	Freshwater Lake	254.0	Acres	Impaired	TMDL needed
Framingham Reservoir #1	MA82044	Framingham	Waterbody Map	Freshwater Lake	117.6	Acres	Impaired	TMDL needed
Framingham Reservoir #2	MA82045	Framingham/Ashland	Waterbody Map	Freshwater Lake	114.4	Acres	Impaired	TMDL needed
Framingham Reservoir #3	MA82046	Framingham	Waterbody Map	Freshwater Lake	221.2	Acres	Impaired	Non-pollutant impairment
Great Meadows Pond #3	MA82053	Concord	Waterbody Map	Freshwater Lake	53.0	Acres	Impaired	Non-pollutant impairment
Grist Mill Pond	MA82055	Sudbury/Marlborough	Waterbody Map	Freshwater Lake	16.7	Acres	Impaired	TMDL needed
Hager Pond	MA82056	Marlborough	Waterbody Map	Freshwater Lake	29.9	Acres	Impaired	TMDL needed
Heard Pond	MA82058	Wayland	Waterbody Map	Freshwater Lake	75.6	Acres	Impaired	TMDL needed
Heart Pond	MA82059	Chelmsford/Westford	Waterbody Map	Freshwater Lake	93.9	Acres	Impaired	TMDL needed
Hocomonco Pond	MA82060	Westborough	Waterbody Map	Freshwater Lake	26.9	Acres	Impaired	TMDL needed
Hop Brook	MA82A-05	Outlet Of Carding Mill Pond, Sudbury To Confluence With Allowance Brook, Sudbury (Allowance Brook Was Identified As Landham Brook On Usgs Quads Prior To 1987).	Waterbody Map	River	6.7	Miles	Impaired	TMDL needed
Hop Brook	MA82A-06	From The Confluence Of Allowance Brook, Sudbury To The Confluence With The Sudbury River, Wayland (This Segment Was Formerly Identified As Wash Brook, Hop Brook Appeared As Wash Brook And Allowance Brook Was Previously Identified As Landham Brook On Usgs Quads Prior To 1987).	Waterbody Map	River	3.0	Miles	Impaired	TMDL needed
Hopkinton Reservoir	MA82061	Hopkinton/Ashland	Waterbody Map	Freshwater Lake	161.1	Acres	Impaired	TMDL needed
Lake Cochituate	MA82020	[North Basin] Natick/Framingham/Wayland	Waterbody Map	Freshwater Lake	195.6	Acres	Impaired	TMDL needed
Lake Cochituate	MA82125	[Middle Basin] Natick/Wayland	Waterbody Map	Freshwater Lake	134.5	Acres	Impaired	TMDL needed
Lake Cochituate	MA82126	[Carling Basin] Natick	Waterbody Map	Freshwater Lake	14.3	Acres	Impaired	TMDL needed
Lake Cochituate	MA82127	[South Basin] Natick	Waterbody Map	Freshwater Lake	239.6	Acres	Impaired	TMDL needed
Little Chauncy Pond	MA82070	Northborough	Waterbody Map	Freshwater Lake	43.3	Acres	Impaired	Non-pollutant impairment
Long Pond	MA82072	Littleton	Waterbody Map	Freshwater Lake	101.7	Acres	Impaired	TMDL needed
Meadow Pond	MA82129	Carlisle	Waterbody Map	Freshwater Lake	12.4	Acres	Impaired	Non-pollutant impairment
Mill Brook	MA82A-20	From The Outlet Of Crosby Pond, Concord To The Confluence With The Concord River, Concord.	Waterbody Map	River	2.7	Miles	Impaired	Non-pollutant impairment
Nashoba Brook	MA82B-14	From Source Just South Of Route 110 In Westford To Confluence With Fort Pond Brook, Concord.	Waterbody Map	River	9.4	Miles	Impaired	TMDL needed
Nutting Lake	MA82088	[East Basin] Billerica	Waterbody Map	Freshwater Lake	30.5	Acres	Impaired	TMDL needed
Nutting Lake	MA82124	[West Basin] Billerica	Waterbody Map	Freshwater Lake	51.4	Acres	Impaired	TMDL completed
Pantry Brook	MA82A-19	From Source West Of Haynes Road, Sudbury To The Confluence With The Sudbury River, Sudbury.	Waterbody Map	River	3.2	Miles	Impaired	TMDL needed
Puffers Pond	MA82092	Maynard/Sudbury	Waterbody Map	Freshwater Lake	28.4	Acres	Impaired	TMDL needed
River Meadow Brook	MA82A-10	From The Outlet Of Russell Mill Pond, Chelmsford To The Confluence With The Concord River, Lowell.	Waterbody Map	River	6.4	Miles	Impaired	TMDL needed
Rocky Pond	MA82095	Boylston	Waterbody Map	Freshwater Lake	61.8	Acres	Impaired	Non-pollutant impairment
Russell Millpond	MA82096	Chelmsford	Waterbody Map	Freshwater Lake	32.9	Acres	Impaired	Non-pollutant impairment
Saxonville Pond	MA82097	Framingham	Waterbody Map	Freshwater Lake	58.8	Acres	Impaired	TMDL needed
Stearns Mill Pond	MA82104	Sudbury	Waterbody Map	Freshwater Lake	19.1	Acres	Impaired	TMDL needed
Sudbury Reservoir	MA82106	Southborough/Marlborough	Waterbody Map	Freshwater Lake	1,178.0	Acres	Impaired	TMDL completed
Sudbury River	MA82A-03	Outlet Saxonville Pond, Framingham To Confluence With Hop Brook (The Lower Portion Of Hop Brook Was Identified As Wash Brook On Usgs Quads Prior To 1987), Wayland.	Waterbody Map	River	5.5	Miles	Impaired	TMDL needed
Sudbury River	MA82A-04	Confluence With Hop Brook (The Lower Portion Of Hop Brook Was Identified As Wash Brook On Usgs Quads Prior To 1987), Wayland To Confluence With Assabet River, Concord.	Waterbody Map	River	11.7	Miles	Impaired	TMDL needed
Unnamed Tributary	MA82A-16	From The Outlet Of Hager Pond, Marlborough To The Inlet Of Grist Mill Pond, Marlborough.	Waterbody Map	River	.2	Miles	Impaired	TMDL needed
Unnamed Tributary	MA82A-17	From The Outlet Of Grist Mill Pond, Sudbury To The Inlet Of Carding Mill Pond, Sudbury.	Waterbody Map	River	.5	Miles	Impaired	TMDL needed
Walden Pond	MA82109	Concord	Waterbody Map	Freshwater Lake	62.9	Acres	Impaired	TMDL completed
Warners Pond	MA82110	Concord	Waterbody Map	Freshwater Lake	59.3	Acres	Impaired	TMDL completed
Waushakum Pond	MA82112	Framingham/Ashland	Waterbody Map	Freshwater Lake	87.2	Acres	Impaired	TMDL needed
Whitehall Reservoir	MA82120	Hopkinton	Waterbody Map	Freshwater Lake	559.6	Acres	Impaired	TMDL needed
Winning Pond	MA82123	Billerica	Waterbody Map	Freshwater Lake	22.2	Acres	Impaired	Non-pollutant impairment

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Causes of Impairment for Reporting Year 2010

Massachusetts, Concord

Description of this table

Cause of Impairment	Size of Assessed Waters with Listed Causes of Impairment
NOTE: Click on the underlined "Cause of Impairment" value to see a listing of those waters with that cause of impairment.
Cause of Impairment	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Chlordane		254.0
Habitat Assessment (Streams)	2.7
Low Flow Alterations	10.7
Non-Native Aquatic Plants	46.0	2,551.3
Aquatic Macroinvertebrate Bioassessments	17.3
Enterococcus Bacteria		134.5
Fish Bioassessments	17.4
Dissolved Oxygen Saturation	7.4	444.3
Other Cause	13.0
Other Flow Regime Alterations		32.9
Polycyclic Aromatic Hydrocarbons (PAHs) (Aquatic Ecosystems)		26.9
Secchi Disk Transparency		75.6
Turbidity		811.5
Excess Algal Growth	31.7	934.8
Fecal Coliform	54.0	46.6
Nutrient/Eutrophication Biological Indicators	12.0
Phosphorus, Total	58.1	1,108.7
Dissolved Oxygen	31.6	1,900.7
pH, High	.2
Aquatic Plants (Macrophytes)	17.4	252.2
Taste and Odor	12.4
Temperature, Water	1.2
Total Suspended Solids (TSS)	.7
Debris/Floatables/Trash	19.7
Escherichia Coli (E. Coli)		124.3
Eurasian Water Milfoil, Myriophyllum Spicatum	15.5	1,985.2
Mercury in Fish Tissue	33.6	3,016.1
PCB(s) in Fish Tissue		584.0

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Probable Sources Contributing to Impairments for Reporting Year 2010

Massachusetts, Concord Watershed

Description of this table

Probable Source	Size of Assessed Waters with Probable Sources of Impairments
Probable Source	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)
Atmospheric Deposition - Toxics		1,443.3
Cercla Npl (Superfund) Sites	33.6	55.4
Combined Sewer Overflows	.9
Contaminated Sediments	11.8
Dam Or Impoundment	10.4
Impacts From Hydrostructure Flow Regulation/Modification	26.4
Introduction Of Non-Native Organisms (Accidental Or Intentional)	46.0	3,755.8
Municipal (Urbanized High Density Area)	6.4
Municipal Point Source Discharges	55.9	106.2
Sanitary Sewer Overflows (Collection System Failures)	1.2
Source Unknown	36.2	4,249.5
Unspecified Urban Stormwater	20.8	355.7
Waterfowl		93.9

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TMDL Alternatives by Cause of Impairment for Reporting Year 2010

Massachusetts, Concord Watershed

No TMDL Alternatives reported.

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Cumulative TMDLs by Pollutant

Massachusetts, Concord Watershed

This chart includes TMDLs since October 1, 1995.

Description of this table

Pollutant	Number of TMDLs Completed	Number of Causes of Impairment Addressed
NOTE: Click on the underlined "Number of TMDLs Completed" value to see a listing of those approved TMDLs for the pollutant.
Mercury	8	8
Phosphorus, Total	8	8
Fecal Coliform	1	1
Mercury in Fish Tissue	1	1

Total: 18 TMDLs; 0 Causes of Impairment

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Massachusetts, Concord Watershed

Features

Assessment Summary for Reporting Year 2010Massachusetts, Concord Watershed

Causes of Impairment for Reporting Year 2010

Massachusetts, Concord

Probable Sources Contributing to Impairments for Reporting Year 2010

Massachusetts, Concord Watershed

TMDL Alternatives by Cause of Impairment for Reporting Year 2010

Massachusetts, Concord Watershed

Cumulative TMDLs by Pollutant

Massachusetts, Concord Watershed

Assessment Summary for Reporting Year 2010
Massachusetts, Concord Watershed