We found 64 public water systems in Middlesex county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Middlesex Water Company | Woodbridge Twp. | 233,376 | 70 | 30 |
| Old Bridge Mua | Old Bridge Twp. | 67,215 | 36 | 11 |
| New Brunswick W Dept | New Brunswick City | 55,000 | 31 | 191 |
| Perth Amboy Water Department | Perth Amboy City- | 52,328 | 34 | 60 |
| East Brunswick Water Utility | East Brunswick Twp. | 48,474 | 26 | 13 |
| South Brunswick Twp W Di | Franklin Twp., South Brunswick Twp. | 45,450 | 82 | 66 |
| Sayreville W Dept | Sayreville Boro | 43,761 | 24 | 49 |
| North Brunswick W Dept | North Brunswick Twp. | 41,000 | 32 | 51 |
| Edison Water Co C/o Nj American Water | Edison Twp. | 35,000 | 51 | 11 |
| Monroe Twp Utility Department | Monroe Twp. | 33,402 | 39 | 100 |
| South River W Dept | South River Boro | 14,000 | 26 | 21 |
| Highland Park W Dept | Highland Park Boro | 14,000 | 27 | 7 |
| Matawan Borough Water De | Aberdeen Twp, Marlboro Twp., Matawan Boro, Old Bridge Twp. | 9,084 | 0 | 147 |
| Spotswood W Dept | Spotswood Boro | 8,300 | 0 | 23 |
| Milltown W Dept | East Brunswick Twp., Milltown Boro, North Brunswick Twp. | 7,000 | 0 | 39 |
| Nj American W Co Jamesbu | Jamesburg Boro, Monroe Twp. | 6,125 | 0 | 0 |
| Helmetta Water Dept | Helmetta Boro | 2,000 | 0 | 35 |
| Matrix Development Group | Cranbury Twp. | 1,020 | 0 | 24 |
| E I Dupont Co F&fp Pant | Sayreville Boro | 450 | 0 | 0 |
| Applegarth School | Monroe Twp. | 450 | 0 | 0 |
| Europa At Monroe | Monroe Twp. | 406 | 0 | 0 |
| St Stephens Mar Thoma Church | South Brunswick Twp. | 405 | 0 | 24 |
| Eagle River Day Camp | Monroe Twp. | 405 | 0 | 0 |
| Eagle River Day Camp - Well #2 | Monroe Twp. | 405 | 0 | 0 |
| Monroe Sports Center | Monroe Twp. | 371 | 0 | 0 |
| Chinmaya Mission Tri State Center | Cranbury Twp. | 352 | 0 | 0 |
| Bakers American Bar & Grille | Monroe Twp. | 313 | 0 | 2 |
| St Davids Episcopal Church | Cranbury Twp. | 303 | 0 | 10 |
| Thompson Park | Monroe Twp. | 250 | 0 | 0 |
| Piscataway Little League Complex | Piscataway Twp. | 250 | 0 | 12 |
| Lake Nelson School | Piscataway Twp. | 165 | 0 | 38 |
| The Gardens At Monroe | Monroe Twp. | 120 | 0 | 0 |
| Cranbury Swim Club | Cranbury Twp. | 110 | 0 | 0 |
| Cranbury Animal Hospital | Cranbury Twp. | 109 | 0 | 0 |
| Springwood Swim Club | Woodbridge Twp. | 105 | 0 | 0 |
| Prologis 66 Station Road | Cranbury Twp. | 104 | 0 | 0 |
| M Hegarty & J Vincent Scalia Funerals | Old Bridge Twp. | 104 | 0 | 0 |
| WYNNEWOOD SWIM CLUB | Piscataway Twp. | 103 | 0 | 0 |
| Perrine Pontiac | Cranbury Twp. | 100 | 0 | 0 |
| Keystone Plastics Inc | South Plainfield Boro | 95 | 0 | 0 |
| Middlesex Presbyterian Church | Middlesex Boro | 81 | 0 | 0 |
| Floral Park Cemetery | South Brunswick Twp. | 55 | 0 | 0 |
| Holland Greenhouse | Monroe Twp. | 52 | 0 | 0 |
| Oil Well | Cranbury Twp. | 50 | 0 | 0 |
| Make A Wish | Monroe Twp. | 50 | 0 | 0 |
| American Cabinetry | Cranbury Twp. | 42 | 0 | 0 |
| Samson Metal Service Inc | Cranbury Twp. | 37 | 0 | 0 |
| Jamesburg Manor | Monroe Twp. | 36 | 0 | 0 |
| West Brook Swim Club | Edison Twp. | 35 | 0 | 0 |
| Cranbury Service Center | Cranbury Twp. | 35 | 0 | 0 |
| Old Bridge Twp Bd Of Edu | Old Bridge Twp. | 35 | 0 | 0 |
| Conoco Gas | Cranbury Twp. | 33 | 0 | 0 |
| New Jersey Dental Assoc | North Brunswick Twp. | 33 | 0 | 0 |
| Lukoil | Old Bridge Twp. | 30 | 0 | 0 |
| St Marys Prim Bapt Chch | South Brunswick Twp. | 30 | 0 | 0 |
| Nativity Of Our Lord Parish | Monroe Twp. | 29 | 0 | 0 |
| Valero | South Brunswick Twp. | 29 | 0 | 0 |
| U-haul Co | Monroe Twp. | 28 | 0 | 0 |
| Raceway Service Center | Monroe Twp. | 28 | 0 | 0 |
| Valero Gas Station | Cranbury Twp. | 27 | 0 | 0 |
| Monroe Self Storage | Monroe Twp. | 27 | 0 | 0 |
| Monroe Professional Plaza | Monroe Twp. | 25 | 0 | 0 |
| Foley Inc | Monroe Twp. | 25 | 0 | 0 |
| Metro Self Storage | Cranbury Twp. | 9 | 0 | 0 |