We found 10 public water systems in Union county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Nj American Water - Raritan | Elizabeth City, Monroe Twp. | 615,430 | 221 | 271 |
| Nj American Water - Short Hills | Bedminster Twp., Belvidere Town, Berkeley Heights Twp., Bernards Twp., Bernardsville Boro, Chatham Boro, Chester Twp., Far Hills Boro, Florham Park Boro, Franklin T | 217,230 | 119 | 20 |
| Nj American Water - Liberty | Elizabeth City- 2004 | 125,000 | 46 | 46 |
| Suez Water New Jersey Rahway | Rahway City | 27,300 | 50 | 17 |
| Winfield Mutual Housing | Winfield Twp. | 1,600 | 0 | 36 |
| Crest View Club Corp - Pavilion | New Providence Boro | 250 | 0 | 0 |
| Crest View Club Corp | New Providence Boro | 250 | 0 | 6 |
| Snuffy Pantagis Enterprises | Scotch Plains Twp. | 85 | 0 | 0 |
| Christopher Academy | Scotch Plains Twp. | 34 | 0 | 0 |
| Cranford Swim & Tennis Club | Cranford Twp. | 25 | 0 | 0 |