PFAS in Massachusetts drinking water

Highest: Raynham Center Water District, 92 ng/L PFAS-4.

261 community water systems · 7,124,235 people served · newest sample May 28, 2026

Highest PFAS-4 in Massachusetts

Ranked by the PFAS-4 sum in each system's headline sample. The pill flags PFOA or PFOS above the 2029 federal MCL.

Raynham Center Water District

92 ng/L PFAS-4 · 10,964 people PFOA or PFOS above the 2029 federal MCL

Duxbury Water Department

67.6 ng/L PFAS-4 · 16,387 people PFOA or PFOS above the 2029 federal MCL

Dartmouth Water Division

50.6 ng/L PFAS-4 · 24,696 people PFOA or PFOS above the 2029 federal MCL

Natick Water and Sewer Division

40.8 ng/L PFAS-4 · 37,006 people PFOA or PFOS above the 2029 federal MCL

Sharon Water Dept

25.2 ng/L PFAS-4 · 16,846 people PFOA or PFOS above the 2029 federal MCL

Abington/Rockland Joint Wtr. Works

23 ng/L PFAS-4 · 33,387 people PFOA or PFOS above the 2029 federal MCL

Hamilton Water Dept

22.3 ng/L PFAS-4 · 7,674 people PFOA or PFOS above the 2029 federal MCL

Pepperell DPW Water Division

21.4 ng/L PFAS-4 · 9,217 people PFOA or PFOS above the 2029 federal MCL

North Attleboro Water Dept

20 ng/L PFAS-4 · 31,410 people PFOA or PFOS above the 2029 federal MCL

Randolph Water Department

19.8 ng/L PFAS-4 · 35,114 people PFOA or PFOS above the 2029 federal MCL

Bridgewater Water Department

18 ng/L PFAS-4 · 28,633 people PFOA or PFOS above the 2029 federal MCL

Middleborough Water Supply

18 ng/L PFAS-4 · 15,350 people PFOA or PFOS above the 2029 federal MCL

Halifax Water Department

17.9 ng/L PFAS-4 · 7,575 people PFOA or PFOS above the 2029 federal MCL

Holbrook Public Works Dept

17 ng/L PFAS-4 · 11,405 people PFOA or PFOS above the 2029 federal MCL

Manchester By the Sea DPW

16.8 ng/L PFAS-4 · 5,201 people PFOA or PFOS above the 2029 federal MCL

Counties (14)

Barnstable County 20 Berkshire County 8 Bristol County 18 Dukes County 3 Essex County 32 Franklin County 5 Hampden County 12 Hampshire County 10 Middlesex County 54 Nantucket County 1 Norfolk County 27 Plymouth County 24 Suffolk County 4 Worcester County 43

Cities and towns (238)

Abington 1 Acton 1 Acushnet 1 Adams 1 Agawam 1 Amesbury 1 Amherst 1 Andover 1 Arlington 1 Ashburnham 2 Ashland 1 Athol 1 Attleboro 1 Auburn 1 Avon 1 Ayer 2 Barnstable 4 Barre 1 Bedford 2 Belchertown 1 Bellingham 1 Belmont 1 Beverly 1 Billerica 1 Blackstone 1 Boston 1 Bourne 3 Boylston 1 Braintree 1 Brewster 1 Bridgewater 1 Brockton 1 Brookline 1 Burlington 1 Cambridge 1 Canton 1 Chatham 1 Chelmsford 2 Chelsea 1 Chicopee 1 Clinton 1 Cohasset 1 Concord 1 Dalton 1 Danvers 1 Dartmouth 1 Dedham 1 Deerfield 1 Dennis 1 Dighton 2 Douglas 1 Dracut 2 Dudley 1 Duxbury 1 East Bridgewater 1 East Longmeadow 1 Eastham 1 Easthampton 1 Easton 1 Edgartown 1 Everett 1 Fairhaven 1 Fall River 1 Falmouth 2 Fitchburg 1 Foxborough 1 Framingham 1 Franklin 1 Gardner 1 Georgetown 1 Gloucester 1 Grafton 1 Great Barrington 1 Greenfield 1 Groton 1 Groveland 1 Hadley 1 Halifax 1 Hamilton 1 Hanover 1 Hanson 1 Harwich 1 Hatfield 1 Haverhill 1 Hingham 1 Holbrook 1 Holden 1 Holliston 1 Holyoke 1 Hopedale 1 Hopkinton 1 Hudson 1 Ipswich 1 Kingston 1 Lancaster 1 Lawrence 1 Lee 1 Leicester 1 Lenox 1 Leominster 1 Lexington 1 Lincoln 1 Littleton 1 Longmeadow 1 Lowell 1 Lunenburg 1 Lynn 1 Lynnfield 2 Malden 1 Manchester 1 Mansfield 1 Marblehead 1 Marion 1 Marlborough 1 Marshfield 1 Mashpee 1 Mattapoisett 2 Maynard 1 Medfield 1 Medford 1 Medway 1 Melrose 1 Merrimac 1 Methuen 1 Middleborough 1 Middleton 1 Milford 1 Millbury 1 Millis 1 Milton 1 Monson 1 Montague 1 Nahant 1 Nantucket 1 Natick 1 Needham 1 New Bedford 1 Newburyport 1 Newton 1 Norfolk 2 North Adams 1 North Andover 1 North Attleborough 1 North Brookfield 1 North Reading 1 Northampton 1 Northborough 1 Northbridge 2 Norton 1 Norwell 1 Norwood 1 Oak Bluffs 1 Orange 1 Orleans 1 Oxford 1 Palmer 1 Paxton 1 Peabody 1 Pembroke 1 Pepperell 1 Pittsfield 1 Plainville 1 Plymouth 2 Provincetown 1 Quincy 1 Randolph 1 Raynham 2 Reading 1 Revere 1 Rockport 1 Rowley 1 Rutland 1 Salem 1 Salisbury 1 Sandwich 2 Saugus 1 Scituate 1 Seekonk 1 Sharon 1 Shirley 2 Shrewsbury 1 Somerset 1 Somerville 1 South Hadley 2 Southampton 1 Southborough 1 Southbridge 1 Southwick 1 Spencer 1 Springfield 1 Sterling 1 Stoneham 1 Stoughton 1 Sturbridge 1 Sudbury 1 Swampscott 1 Swansea 1 Taunton 1 Templeton 1 Tewksbury 1 Tisbury 1 Topsfield 1 Townsend 1 Tyngsborough 1 Upton 1 Uxbridge 1 Wakefield 1 Walpole 1 Waltham 1 Ware 1 Wareham 2 Watertown 1 Wayland 1 Webster 1 Wellesley 1 Wenham 1 West Boylston 1 West Bridgewater 1 West Newbury 1 West Springfield 1 Westborough 1 Westfield 1 Westford 2 Westminster 1 Weston 1 Weymouth 1 Whately 1 Whitman 1 Wilbraham 1 Williamstown 1 Wilmington 1 Winchendon 1 Winchester 1 Winthrop 1 Woburn 1 Worcester 1 Wrentham 1 Yarmouth 1

Other water systems in Massachusetts (246)

Largest first. "Not detected" means below the 3 to 4 ng/L reporting limits, not zero.

Boston Water and Sewer Commission (MWRA)

675,647 people PFAS-4 not detected

Worcester Dpwp, Water Supply Division

206,518 people PFAS-4 not detected

Springfield Water and Sewer Commission

169,170 people PFAS-4 not detected

Lowell Regional Water Utility

120,418 people PFAS-4 not detected

Cambridge Water Department

118,214 people PFAS-4 not detected

Quincy Water Dept. (MWRA)

106,000 people PFAS-4 not detected

Brockton Water Department

105,788 people PFAS-4 not detected

Inima USA / Aquaria LLC

105,643 people PFAS-4 not detected

Lynn Water and Sewer Comm

101,253 people PFOA or PFOS above the 2029 federal MCL

City of New Bedford Dpi

101,079 people PFAS-4 not detected

Falmouth Water Dept

97,551 people PFAS-4 not detected

Fall River Water Department

94,000 people PFAS-4 not detected

Lawrence Water Works

89,143 people PFAS-4 not detected

Newton Water Dept. (MWRA)

88,931 people PFAS-4 not detected

Somerville Water Dept. (MWRA)

81,045 people PFAS-4 not detected

Framingham Water Dept. (MWRA)

72,362 people PFAS-4 not detected

Malden Water Division (MWRA)

66,263 people PFAS-4 not detected

Waltham Water Department

65,218 people PFAS-4 not detected

Dennis Water District

65,000 people PFAS-4 not detected

Brookline Water and Sewer Division

63,191 people PFAS-4 not detected

Revere Water Division (MWRA)

62,186 people PFAS-4 not detected

Taunton Water Division

62,165 people PFAS-4 not detected

Medford Water Dept. (MWRA)

61,700 people PFAS-4 not detected

Haverhill Water Dept

61,277 people PFAS-4 not detected

Weymouth Water Department

57,871 people PFAS-4 not detected

Upper Cape Regional Water Cooperative

56,250 people PFAS-4 not detected

Chicopee Water Dept (MWRA)

55,560 people PFAS-4 not detected

Peabody Water Dept.

54,481 people PFOA or PFOS above the 2029 federal MCL

Methuen Water Dept

53,059 people PFAS-4 quantified

Centerville Osterville Marstons Mills WD

50,000 people PFOA or PFOS above the 2029 federal MCL

Everett Water Dept. (MWRA)

49,075 people PFAS-4 not detected

Beverly Water Dept

47,461 people PFAS-4 not detected

Plymouth Water Department

47,100 people PFAS-4 not detected

Attleboro Water Dept

46,461 people PFAS-4 not detected

Arlington Water Dept. (MWRA)

46,308 people PFAS-4 not detected

Weir River Water System

45,339 people PFOA or PFOS above the 2029 federal MCL

Salem Water Department

44,480 people PFAS-4 not detected

Pittsfield DPU Water Dept

43,927 people PFAS-4 not detected

Billerica Water Works

42,119 people PFOA or PFOS above the 2029 federal MCL

Fitchburg DPW Division of Water Supply

41,946 people PFAS-4 not detected

Marlborough DPW Water Div. (MWRA)

41,799 people PFAS-4 not detected

Leominster Water Division

41,683 people PFOA or PFOS above the 2029 federal MCL

Dedham Westwood Water Dist.

41,630 people PFOA or PFOS above the 2029 federal MCL

Westfield Dpwwater Division

41,094 people PFAS-4 not detected

Woburn Water Dept.

40,876 people PFOA or PFOS above the 2029 federal MCL

Chelsea Water Dept. (MWRA)

40,787 people PFAS-4 not detected

Amherst DPW Water Division

39,263 people PFAS-4 not detected

Harwich Water Department

39,144 people PFAS-4 not detected

Braintree Water and Sewer Dept.

39,143 people PFOA or PFOS above the 2029 federal MCL

Yarmouth Water Department

38,900 people PFAS-4 quantified

Shrewsbury Water Department

38,325 people PFOA or PFOS above the 2029 federal MCL

Holyoke Water Works

37,838 people PFAS-4 not detected

Gloucester Public Utility Division

37,440 people PFAS-4 not detected

Mashpee Water District

36,922 people PFAS-4 not detected

Andover Water Dept

36,569 people PFAS-4 not detected

Watertown Department of Public Works

35,985 people PFAS-4 not detected

Brewster Water Department

35,000 people PFAS-4 not detected

Hyannis Water System, Town of Barnstable

35,000 people PFAS-4 not detected

Lexington Water Dept. (MWRA)

34,074 people PFAS-4 not detected

Marshfield Water Department

34,000 people PFOA or PFOS above the 2029 federal MCL

Franklin Water Department

33,706 people PFAS-4 not detected

Needham Water Dept

31,664 people PFAS-4 quantified

Tewksbury Water Department

31,342 people PFOA or PFOS above the 2029 federal MCL

North Andover Water Dept

30,915 people PFAS-4 not detected

Milford Water Department

30,379 people PFOA or PFOS above the 2029 federal MCL

Chatham Water Department

30,000 people PFAS-4 not detected

Melrose Water Division (MWRA)

29,938 people PFAS-4 not detected

Norwood Water Dept. (MWRA)

29,909 people PFAS-4 not detected

Mattapoisett River Valley W.D.

29,600 people PFAS-4 not detected

Northampton Water Division

29,571 people PFAS-4 not detected

Wellesley Water Division

29,550 people PFOA or PFOS above the 2029 federal MCL

Stoughton Water Department

29,281 people PFOA or PFOS above the 2029 federal MCL

West Springfield DPW Water Division

28,835 people PFAS-4 not detected

Chelmsford Water District

28,750 people PFAS-4 not detected

Agawam Water Department

28,692 people PFAS-4 not detected

Milton Water Dept. (MWRA)

28,630 people PFAS-4 not detected

Danvers Water Dept.

28,087 people PFOA or PFOS above the 2029 federal MCL

Saugus Water Dept. (MWRA)

27,844 people PFAS-4 not detected

Wannacomet Water Company

27,703 people PFAS-4 not detected

Belmont Water Dept. (MWRA)

27,442 people PFAS-4 not detected

Wakefield Water Dept

27,090 people PFOA or PFOS above the 2029 federal MCL

Reading Water Department (MWRA)

26,262 people PFAS-4 not detected

Burlington Water Dept

25,864 people PFAS-4 not detected

Dracut Water Supply District

25,808 people PFOA or PFOS above the 2029 federal MCL

Easton Water Div

25,058 people PFAS-4 not detected

Walpole Water Dept

24,070 people PFAS-4 quantified

Oak Bluffs Water District

24,000 people PFAS-4 not detected

Stoneham Water Dept (MWRA Supply)

23,244 people PFAS-4 not detected

Sandwich Water District

23,000 people PFAS-4 not detected

Winchester Water Dept

22,970 people PFAS-4 not detected

Canton Water Dept

22,766 people PFOA or PFOS above the 2029 federal MCL

Bourne Water District

22,500 people PFOA or PFOS above the 2029 federal MCL

Provincetown Water Department

22,250 people PFAS-4 not detected

Mansfield Water Division

21,797 people PFOA or PFOS above the 2029 federal MCL

Wilmington Water Dept

21,654 people PFAS-4 not detected

Westborough Water Department

21,567 people PFAS-4 not detected

Gardner Water Department

21,381 people PFAS-4 not detected

Acton Water Supply District

21,285 people PFOA or PFOS above the 2029 federal MCL

Marblehead Water Dept. (MWRA)

20,441 people PFAS-4 not detected

Newburyport Water Department

20,335 people PFAS-4 not detected

Wareham Fire District

20,102 people PFAS-4 not detected

Hudson Water Supply

20,032 people PFAS-4 not detected

Southbridge Water Department

19,562 people PFAS-4 not detected

Winthrop Water Division, (MWRA)

19,316 people PFAS-4 not detected

Scituate Water Division

19,297 people PFOA or PFOS above the 2029 federal MCL

Norton Water Department

19,161 people PFOA or PFOS above the 2029 federal MCL

Westford Water Department

18,848 people PFOA or PFOS above the 2029 federal MCL

Ashland Water and Sewer Dept.

18,832 people PFAS-4 not detected

Concord Water Dept

18,788 people PFOA or PFOS above the 2029 federal MCL

Foxboro Water Department

18,721 people PFOA or PFOS above the 2029 federal MCL

Sudbury Water District

18,416 people PFOA or PFOS above the 2029 federal MCL

Somerset Water Department

18,303 people PFAS-4 not detected

Pembroke Water Division DPW

18,175 people PFAS-4 not detected

Holden Water Division, DPW

18,016 people PFOA or PFOS above the 2029 federal MCL

Webster Water Department

17,776 people PFOA or PFOS above the 2029 federal MCL

Greenfield Water Department

17,768 people PFAS-4 not detected

Orleans Water Department

17,460 people PFAS-4 not detected

Swansea Water District

17,375 people PFAS-4 quantified

Amesbury DPW Water Div.

17,366 people PFAS-4 not detected

Bellingham DPW Water Sewer Division

16,556 people PFAS-4 not detected

North Reading Water Dept.

16,379 people PFAS-4 not detected

East Longmeadow DPW Water Dept

16,358 people PFAS-4 not detected

Easthampton Water Dept

16,211 people PFAS-4 not detected

Longmeadow Water Dept

15,853 people PFAS-4 not detected

Clinton Water Dept

15,428 people PFAS-4 not detected

Swampscott Water Dept. (MWRA)

15,300 people PFAS-4 not detected

Fairhaven Water Dept

15,155 people PFAS-4 not detected

Holliston Water Department

15,139 people PFOA or PFOS above the 2029 federal MCL

Hanover Water Dept

14,984 people PFOA or PFOS above the 2029 federal MCL

Bedford Water Dept.

14,955 people PFAS-4 not detected

Whitman Water System

14,947 people PFAS-4 not detected

South Hadley FD #1 (MWRA)

14,800 people PFAS-4 not detected

Kingston Water Department

14,715 people PFAS-4 not detected

East Bridgewater Water Dept

14,526 people PFOA or PFOS above the 2029 federal MCL

Medway Water Department

14,176 people PFOA or PFOS above the 2029 federal MCL

Wayland Water Department

14,096 people PFOA or PFOS above the 2029 federal MCL

Seekonk Water District

13,801 people PFOA or PFOS above the 2029 federal MCL

Northborough Water Department (MWRA)

13,551 people PFAS-4 not detected

Ipswich DPU Water Dept

13,138 people PFOA or PFOS above the 2029 federal MCL

North Adams Water Dept

13,000 people PFAS-4 not detected

Medfield Water Dept.

12,713 people PFOA or PFOS above the 2029 federal MCL

Hopkinton Water Department

12,680 people PFOA or PFOS above the 2029 federal MCL

Auburn Water District

12,255 people PFOA or PFOS above the 2029 federal MCL

Wrentham Water Division

12,190 people PFAS-4 not detected

11,789 people PFAS-4 not detected

Uxbridge DPW, Water Division

11,612 people PFOA or PFOS above the 2029 federal MCL

Norwell Water Department

11,495 people PFOA or PFOS above the 2029 federal MCL

Ash/Win Joint Water Authority

11,394 people PFAS-4 not detected

Weston Water Dept.

11,391 people PFAS-4 not detected

Aquarion Water Company, Millbury

11,368 people PFAS-4 not detected

Grafton Water District

10,925 people PFOA or PFOS above the 2029 federal MCL

Southborough DPW Water Division (MWRA)

10,638 people PFAS-4 not detected

Maynard DPW, Water Division

10,616 people PFOA or PFOS above the 2029 federal MCL

Athol DPW Water Division

10,587 people PFAS-4 not detected

Ware Water Dept

10,066 people PFOA or PFOS above the 2029 federal MCL

Rockport Water Dept

10,000 people PFAS-4 not detected

Lenox DPW Water Division

9,800 people PFAS-4 not detected

Kenwood Water District

9,620 people PFOA or PFOS above the 2029 federal MCL

Hanson Water Department

9,612 people PFOA or PFOS above the 2029 federal MCL

Aquarion Water Company, Pinehills

9,478 people PFAS-4 not detected

Blackstone Water Department

9,463 people PFOA or PFOS above the 2029 federal MCL

Salisbury Water Division

9,334 people PFAS-4 not detected

Littleton Water Department

9,307 people PFAS-4 not detected

Millis Water Dept

9,055 people PFOA or PFOS above the 2029 federal MCL

Plainville Water Department

8,805 people PFOA or PFOS above the 2029 federal MCL

Georgetown Water Department

8,766 people PFAS-4 not detected

Wilbraham Water Dept (MWRA)

8,533 people PFAS-4 not detected

Lynnfield Center Water District

8,525 people PFOA or PFOS above the 2029 federal MCL

Ayer DPW Water Division

8,479 people PFAS-4 not detected

Acushnet Water Department

8,430 people PFAS-4 not detected

Northbridge Water Division

8,127 people PFAS-4 not detected

Turners Falls Water Dept

8,080 people PFAS-4 not detected

Edgartown Water Department

8,027 people PFAS-4 not detected

Adams Fire District

7,945 people PFAS-4 not detected

Whitinsville Water Company

7,899 people PFAS-4 not detected

West Bridgewater Water Dept

7,709 people PFOA or PFOS above the 2029 federal MCL

Buzzards Bay Water District

7,700 people PFAS-4 not detected

Mattapoisett Water Department

7,685 people PFAS-4 not detected

Southwick Water Dept

7,669 people PFAS-4 not detected

North Chelmsford Water Dist

7,660 people PFAS-4 not detected

Norfolk Water Division

7,602 people PFOA or PFOS above the 2029 federal MCL

Cohasset Water Dept

7,555 people PFOA or PFOS above the 2029 federal MCL

Aquarion Water Company Oxford

7,384 people PFAS-4 not detected

Williamstown Water Dept

7,326 people PFAS-4 not detected

Middleton Water Dept.

7,291 people PFAS-4 not detected

Lunenburg Water District

7,219 people PFAS-4 not detected

Spencer Water Department

7,037 people PFAS-4 not detected

Merrimac Water Department

6,988 people PFOA or PFOS above the 2029 federal MCL

West Boylston Water District

6,919 people PFOA or PFOS above the 2029 federal MCL

Townsend Water Department

6,832 people PFOA or PFOS above the 2029 federal MCL

Sterling Water Department

6,715 people PFOA or PFOS above the 2029 federal MCL

Orange Water Dept

6,526 people PFAS-4 not detected

Groveland Water Department

6,508 people PFOA or PFOS above the 2029 federal MCL

Devens Massdevelopment

6,500 people PFAS-4 not detected

Dalton Fire District

6,330 people PFAS-4 not detected

South Hadley Fire District #2 Water Dept

6,200 people PFAS-4 not detected

Town of Eastham

6,199 people PFAS-4 not detected

Rowley Water Department

6,161 people PFOA or PFOS above the 2029 federal MCL

Templeton Munic. Light and Water Plant

6,159 people PFOA or PFOS above the 2029 federal MCL

Marion Water Division

6,119 people PFAS-4 not detected

Tisbury Water Works

6,082 people PFAS-4 not detected

Rutland Water Department

6,025 people PFAS-4 not detected

Hopedale Water Department

6,017 people PFOA or PFOS above the 2029 federal MCL

Lancaster Water Department

6,000 people PFAS-4 not detected

Otis Air National Guard Base

6,000 people PFAS-4 not detected

Winchendon Water Department

5,706 people PFAS-4 not detected

5,686 people PFAS-4 not detected

Lincoln Water Dept

5,593 people PFOA or PFOS above the 2029 federal MCL

Dudley Water Department

5,515 people PFAS-4 not detected

Groton Water Department

5,456 people PFAS-4 not detected

Topsfield Water Department

5,435 people PFOA or PFOS above the 2029 federal MCL

Barnstable Fire District

5,400 people PFOA or PFOS above the 2029 federal MCL

Onset Fire Districtwater Dept.

5,392 people PFOA or PFOS above the 2029 federal MCL

Dighton Water District

5,280 people PFOA or PFOS above the 2029 federal MCL

Cotuit Fire District Water Department

4,938 people PFAS-4 not detected

Southampton Water Dept

4,853 people PFAS-4 not detected

Lynnfield Water Dist. (MWRA)

4,820 people PFAS-4 not detected

Hadley DPW Water Division

4,819 people PFAS-4 not detected

Palmer Water District No.1

4,789 people PFAS-4 not detected

4,777 people PFOA or PFOS above the 2029 federal MCL

Sturbridge Water Department

4,746 people PFAS-4 not detected

West Newbury Water Department

4,704 people PFAS-4 not detected

North Sagamore Water District

4,668 people PFAS-4 not detected

Upton DPW Water/Wastewater Division

4,420 people PFAS-4 not detected

Tyngsborough Water District

4,416 people PFAS-4 not detected

Douglas Water Department

4,400 people PFAS-4 quantified

Great Barrington Fire Dist

4,380 people PFAS-4 not detected

Paxton Water Department

4,300 people PFAS-4 not detected

Monson Water and Sewer Dept

4,222 people PFAS-4 not detected

Shirley Water District

4,165 people PFOA or PFOS above the 2029 federal MCL

Wenham Water Dept.

3,942 people PFOA or PFOS above the 2029 federal MCL

North Raynham Water District

3,902 people PFAS-4 not detected

Westminster Department of Public Works

3,889 people PFAS-4 not detected

North Brookfield Water Department

3,863 people PFAS-4 not detected

South Deerfield Water Supply District

3,800 people PFAS-4 not detected

Cherry Valley/ Rochdale Water District

3,696 people PFAS-4 not detected

Ashburnham Water Department

3,680 people PFAS-4 not detected

3,500 people PFAS-4 quantified

Boylston Water District

3,343 people PFAS-4 quantified

Nahant Water Dept. (MWRA)

3,334 people PFAS-4 not detected

Belchertown Water District

3,253 people PFAS-4 not detected

Hatfield Water Dept

3,164 people PFAS-4 not detected

Barre Water Department

2,610 people PFAS-4 not detected

Mci Norfolk/Cedar Junction/Walpole

2,200 people PFAS-4 not detected

Whately Water Department

900 people PFAS-4 not detected

Haystack Estates

60 people PFOA or PFOS above the 2029 federal MCL

Massachusetts PFAS limits (state MCLs)

Compound	State MCL	Federal MCL (from April 2029)	In force since
PFAS6 · sum of six compounds	20 ng/L	none	October 2, 2020

Source: Massachusetts Department of Environmental Protection (MassDEP), Drinking Water Program, 310 CMR 22.07G. https://www.mass.gov/info-details/per-and-polyfluoroalkyl-substances-pfas-in-drinking-water

How to read these numbers

This page lists all 261 community water systems in Massachusetts with UCMR 5 PFAS results, across 14 counties. We compare each one with our 0.5 ng/L PFAS-4 benchmark and with the 4.0 ng/L federal MCL for PFOA and PFOS, which applies from April 2029. UCMR 5 results do not indicate compliance or noncompliance with the PFAS drinking water standards. The samples come from entry points, with 3 to 4 ng/L reporting limits. Massachusetts also enforces its own PFAS MCLs under 310 CMR 22.07G (table above). State agency: Massachusetts Department of Environmental Protection (MassDEP), Drinking Water Program. State monitoring: quarterly compliance monitoring since 2021 (large systems) and 2022 (small systems); results on the EEA Data Portal up to 30 days after submission. Regulation data retrieved September 19, 2026.

This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.