444 water systems in Massachusetts have at least one health-based violation on record. The system with the most health-based violations is Twin Oaks MHP Midland in Savoy with 65 health-based violations. Health-based violations mean a system exceeded an EPA maximum contaminant level or failed required treatment standards.
| Water System | City | Population | Health Violations | Total Violations |
|---|
| Twin Oaks MHP Midland |
Savoy | 234 |
65 | 101 |
| Cherry Valley/ Rochdale Water District |
Rochdale | 3,696 |
48 | 48 |
| First Parish Church of Berlin |
Berlin | 25 |
40 | 61 |
| Boumil Grove Condos |
Andover | 72 |
35 | 56 |
| Raymond Woods Townhouses |
Scituate | 50 |
32 | 54 |
| 563 Providence-New London Tnpk |
Taunton | 25 |
31 | 71 |
| Springfield Water and Sewer Commission |
Springfield | 167,954 |
27 | 55 |
| Mount St Marys Abbey |
Wrentham | 60 |
26 | 51 |
| Longmeadow Water Dept |
Longmeadow | 15,815 |
26 | 41 |
| Millville Elementary School |
Millville | 400 |
25 | 38 |
| Monroe Water District |
Monroe | 55 |
23 | 53 |
| Bellingham Dpw Water Sewer Division |
Bellingham | 16,061 |
23 | 34 |
| Woods Pond Condominiums |
Raynham | 104 |
23 | 28 |
| Dartmouth Water Division |
Dartmouth | 24,630 |
22 | 33 |
| Country Manor |
Norton | 66 |
21 | 89 |
| Hanover Water Dept |
Hanover | 14,984 |
21 | 67 |
| Madden Estates |
West Brookfield | 50 |
20 | 36 |
| Plainville Water Department |
Plainville | 8,805 |
20 | 26 |
| Swansea Water District |
Swansea | 17,375 |
20 | 24 |
| Somerset Water Department |
Somerset | 18,303 |
18 | 18 |
| Three Rivers M H Community |
Sudbury | 63 |
15 | 21 |
| Church of Latter Day Saints Tipton Branc |
Foxboro | 25 |
14 | 100 |
| Rutland Water Department |
Rutland | 5,605 |
14 | 20 |
| Holliston Water Department |
Holliston | 15,713 |
12 | 231 |
| Chester Water Dept |
Chester | 750 |
12 | 66 |
| Maynard Dpw, Water Division |
Maynard | 10,401 |
12 | 30 |
| Koa Bangor RV LLC |
Quincy | 300 |
12 | 28 |
| East Longmeadow Dpw Water Dept |
East Longmeadow | 16,161 |
12 | 22 |
| Gibson Hill Park |
Boston | 100 |
11 | 244 |
| Fawn Ridge Association Inc. |
Charlton | 36 |
11 | 31 |
| The Dox Condos |
Northbridge | 55 |
11 | 12 |
| Canterbury Plains Mall |
Worcester | 46 |
10 | 54 |
| Agawam Water Department |
Agawam | 28,692 |
10 | 18 |
| Kokatosi Campground - Kitchen |
Quincy | 25 |
9 | 58 |
| Scituate Water Division |
Scituate | 19,297 |
9 | 44 |
| Revel Pelham |
Westborough | 123 |
9 | 15 |
| North Reading Water Dept. |
North Reading | 16,054 |
9 | 11 |
| Norton Water Department |
Norton | 19,161 |
9 | 10 |
| Melrose Water Division (Mwra) |
Melrose | 29,357 |
9 | 9 |
| 1896 House Restaurant |
Williamstown | 34 |
8 | 29 |
| Mill River Water Takers Association |
Mill River | 150 |
8 | 20 |
| Medford Water Dept. (Mwra) |
Medford | 61,700 |
8 | 11 |
| Spofford Pond School |
Boxford | 486 |
7 | 62 |
| Brookwood Apartments |
Marblehead | 44 |
7 | 55 |
| Kokatosi Campground - Group Area |
Quincy | 108 |
7 | 54 |
| Housatonic Water Works |
Great Barrington | 1,391 |
7 | 24 |
| Sebago Pine Water Assoc-Lower |
Billerica | 40 |
7 | 23 |
| Camping on the Battenkill |
Quincy | 452 |
7 | 22 |
| Lowell Regional Water Utility |
Lowell | 115,000 |
7 | 11 |
| Immaculate Heart of Mary School |
Still River | 110 |
7 | 11 |
| Malden Water Division (Mwra) |
Malden | 66,263 |
7 | 10 |
| Chelsea Water Dept. (Mwra) |
Chelsea | 38,319 |
7 | 10 |
| Stoneham Water Dept (Mwra Supply) |
Stoneham | 23,244 |
7 | 8 |
| Westminster Department of Public Works |
Westminster | 3,741 |
7 | 8 |
| Billerica Water Works |
Billerica | 42,119 |
7 | 7 |
| Great Barrington Fire Dist |
Great Barrington | 4,375 |
6 | 86 |
| Koch Rt2 Toyota / Mysa |
Lancaster | 50 |
6 | 24 |
| Falmouth Water Dept |
Falmouth | 97,551 |
6 | 9 |
| Somerville Water Dept. (Mwra) |
Somerville | 81,045 |
6 | 7 |
| Everett Water Dept. (Mwra) |
Everett | 49,075 |
6 | 7 |
| Hilltown Community Development Corp |
Chesterfield | 45 |
6 | 7 |
| Weston Water Dept. |
Weston | 11,941 |
6 | 6 |
| P&H Truckstop Inc |
Waltham | 150 |
6 | 6 |
| Hyland Orchard |
Brimfield | 50 |
6 | 6 |
| Rowley Water Department |
Rowley | 6,283 |
5 | 85 |
| Kokatosi Campground - Bathhouse |
Quincy | 200 |
5 | 48 |
| Long Pond Realty Trust |
Plymouth | 90 |
5 | 34 |
| Tasker Day Camp/Main Cottage |
Haverhill | 150 |
5 | 23 |
| Westover Arb |
Chicopee | 950 |
5 | 12 |
| Leominster Water Division |
Leominster | 41,683 |
5 | 11 |
| Pine Valley Estates |
Amesbury | 40 |
5 | 11 |
| Dighton Water District |
North Dighton | 5,264 |
5 | 9 |
| Brockton Water Department |
Brockton | 105,643 |
5 | 8 |
| Abington/Rockland Joint Wtr. Works |
Rockland | 33,647 |
5 | 8 |
| South Deerfield Water Supply District |
South Deerfield | 3,800 |
5 | 8 |
| Revere Water Division (Mwra) |
Revere | 62,186 |
5 | 7 |
| Concord Water Dept |
Concord | 18,788 |
5 | 7 |
| Assurance Technology Corp. |
Carlisle | 75 |
5 | 7 |
| Waltham Water Department |
Waltham | 65,218 |
5 | 6 |
| Milton Water Dept. (Mwra) |
Milton | 28,630 |
5 | 6 |
| Wakefield Water Dept |
Wakefield | 27,090 |
5 | 6 |
| Wilmington Water Dept |
Wilmington | 22,481 |
5 | 6 |
| Winthrop Water Division, (Mwra) |
Winthrop | 19,316 |
5 | 6 |
| Dcr Horseneck Beach State Reservation |
Boston | 3,000 |
5 | 6 |
| Norwood Water Dept. (Mwra) |
Norwood | 29,909 |
5 | 5 |
| Partners Village Store |
Westport | 50 |
5 | 5 |
| 1414 Mass Ave Boxborough |
Maynard | 50 |
4 | 67 |
| Prindle Pond Conference Center |
Charlton | 305 |
4 | 42 |
| Boxborough Executive Office Center |
Boxborough | 60 |
4 | 30 |
| Kingston Water Department |
Kingston | 14,712 |
4 | 23 |
| Old Lawrence Road |
Waltham | 25 |
4 | 23 |
| Raynham Athletic Club |
Raynham | 500 |
4 | 19 |
| Tl Storer/Adams/Main |
Woburn | 240 |
4 | 18 |
| Camp Otter/The Landing |
Andover | 325 |
4 | 17 |
| Camp Otter/ Upper Bathhouse |
Andover | 325 |
4 | 17 |
| Nouria Energy-Hollis |
Worcester | 25 |
4 | 17 |
| Mci Bridgewater |
Milford | 2,802 |
4 | 14 |
| Fayette Family & Friends Campground |
Haverill | 38 |
4 | 13 |
| Wrentham Developmental Center |
Wrentham | 937 |
4 | 10 |
| Nahant Water Dept. (Mwra) |
Nahant | 3,334 |
4 | 9 |