We found 99 public water systems in Union county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Mifflinburg Boro Water Dept | County of Union | 3,690 | 0 | 175 |
| Federal Penitentiary-lewisburg | County of Union | 2,300 | 0 | 0 |
| New Berlin Municipal Authority | County of Union | 990 | 0 | 49 |
| Sun Area Vo Tech School | County of Union | 850 | 0 | 0 |
| Gregg Twp Municipal Auth | Allenwood | 725 | 0 | 0 |
| Hidden Valley Camping Resort | County of Union | 600 | 0 | 8 |
| Pine Valley Mobile Home Court | County of Union | 425 | 0 | 188 |
| Rb Winter State Park Mccall | County of Union | 400 | 0 | 0 |
| R B Winter State Park | County of Union | 400 | 0 | 24 |
| Nittany Mountain Koa | County of Union | 350 | 0 | 12 |
| West Buffalo Twp Mun Auth | County of Union | 333 | 0 | 78 |
| Lewisburg Alliance Church | County of Union | 300 | 0 | 0 |
| Laurelton State School & Hosp | County of Union | 290 | 0 | 0 |
| Chilly Willys | County of Union | 250 | 0 | 5 |
| White Deer Run Treatment Centr | County of Union | 226 | 0 | 128 |
| Family Life Center | County of Union | 200 | 0 | 0 |
| Bingamans Drive In | County of Union | 200 | 0 | 0 |
| Christ United Lutheran Church | County of Union | 200 | 0 | 11 |
| United Pentecostal Church | County of Union | 150 | 0 | 0 |
| Trinity Umc Winfield | County of Union | 150 | 0 | 0 |
| West End Bible Fellowship | County of Union | 125 | 0 | 0 |
| Camp Mount Luther | County of Union | 120 | 0 | 0 |
| Lewis Trailer Court | County of Union | 112 | 0 | 0 |
| Kahley's Weikert Store | County of Union | 100 | 0 | 0 |
| River Edge Campground | County of Union | 100 | 0 | 0 |
| Reptiland | County of Union | 100 | 0 | 0 |
| Penndot-site 44 Primitive Rest | County of Union | 100 | 0 | 0 |
| The Barnyard | County of Union | 100 | 0 | 0 |
| Buffalo Valley Um Church | County of Union | 100 | 0 | 0 |
| Fisher's Mobile Home Park | County of Union | 96 | 0 | 0 |
| Shady Grove Christian School | County of Union | 90 | 0 | 0 |
| Laurelton Elementary School | County of Union | 77 | 0 | 0 |
| Pennscreek Campground | County of Union | 75 | 0 | 0 |
| Natural Food & Garden Store | County of Union | 75 | 0 | 0 |
| Wesley Forest Camp | County of Union | 75 | 0 | 0 |
| White Deer Run | County of Union | 75 | 0 | 0 |
| Pik Rite | County of Union | 70 | 0 | 0 |
| Double D | County of Union | 70 | 0 | 0 |
| Rolling Hills Manor | County of Union | 64 | 0 | 0 |
| Hilliside Bible Church | County of Union | 53 | 0 | 0 |
| Wagon Wheel Restaurant | County of Union | 53 | 0 | 0 |
| Weaver,s Sunset | County of Union | 50 | 0 | 0 |
| Hidden Creek Campsites | County of Union | 50 | 0 | 0 |
| Smiths | County of Union | 50 | 0 | 0 |
| Kuhns Brothers Lumber Co | County of Union | 50 | 0 | 0 |
| Ards Market | County of Union | 50 | 0 | 0 |
| Central Pa Wesleyan Campground | County of Union | 50 | 0 | 0 |
| Boomerangs | County of Union | 50 | 0 | 0 |
| D C Coffee & Tea Co | County of Union | 50 | 0 | 0 |
| Oriental Acres | County of Union | 50 | 0 | 0 |
| Fisher S Family Diner | County of Union | 50 | 0 | 0 |
| Forest House Hotel | County of Union | 50 | 0 | 0 |
| United Methodist Church | County of Union | 45 | 0 | 0 |
| Pine Valley Courts | County of Union | 40 | 0 | 0 |
| Church Of God In Christ | County of Union | 40 | 0 | 0 |
| Union Co Sportsmans Club | County of Union | 30 | 0 | 0 |
| Hartley Twp Community Center | County of Union | 30 | 0 | 0 |
| White Springs Methodist Church | County of Union | 30 | 0 | 0 |
| Allenwood Diner | County of Union | 25 | 0 | 0 |
| C & J Lunch & Catering | County of Union | 25 | 0 | 0 |
| Newky Country Store | County of Union | 25 | 0 | 0 |
| Sunset Icecream & Pizza | County of Union | 25 | 0 | 0 |
| Winfield Auction | County of Union | 25 | 0 | 0 |
| Ivys Pub | County of Union | 25 | 0 | 0 |
| Stoney Run Drive In | County of Union | 25 | 0 | 0 |
| Ann's Snack Bar | County of Union | 25 | 0 | 0 |
| Union Twp Fire Co | County of Union | 25 | 0 | 0 |
| Guffy's General Store | County of Union | 25 | 0 | 0 |
| Campioka | County of Union | 25 | 0 | 0 |
| Kelly Point Store | County of Union | 25 | 0 | 0 |
| The Purple Cow | County of Union | 25 | 0 | 0 |
| Wengers Discount Grocery | County of Union | 25 | 0 | 0 |
| Old Saw Mill Campground | County of Union | 25 | 0 | 0 |
| Sunsational Family Camp | County of Union | 25 | 0 | 0 |
| Laurel Market | County of Union | 25 | 0 | 0 |
| YODER ZIMMERMAN VFW POST 1964 | County of Union | 25 | 0 | 0 |
| Chubbs Auction | County of Union | 25 | 0 | 0 |
| West End Social Club | County of Union | 25 | 0 | 0 |
| Buffalo Valley Sportsmans Club | County of Union | 25 | 0 | 0 |
| Hartley Twp Rec Center | County of Union | 25 | 0 | 0 |
| Forest Hill General Store | County of Union | 25 | 0 | 0 |
| Shikellamy State Park | County of Union | 25 | 0 | 0 |
| Sand Bridge State Park | County of Union | 25 | 0 | 0 |
| Camp Karoondinha B S A | County of Union | 25 | 0 | 0 |
| Don & Nan Soft Serve | County of Union | 25 | 0 | 0 |
| Harveys Food Mart | County of Union | 25 | 0 | 0 |
| La Primavera | County of Union | 25 | 0 | 0 |
| Harveys | County of Union | 25 | 0 | 0 |
| Route 45 Cafe | County of Union | 25 | 0 | 0 |
| Kochs Country Store | County of Union | 25 | 0 | 0 |
| Grenobles Catering | County of Union | 25 | 0 | 0 |
| Pedue's Store | County of Union | 25 | 0 | 0 |
| Vicksburg Comminity Hall | County of Union | 25 | 0 | 0 |
| Om Aaa Truck Stop | County of Union | 25 | 0 | 0 |
| Inn On The Fiddler's Tract | County of Union | 25 | 0 | 0 |
| Mountain Valley Inc | County of Union | 25 | 0 | 0 |
| Big Wrangler Steak House | County of Union | 25 | 0 | 0 |
| Goodhart Mobilehome Park | County of Union | 21 | 0 | 0 |
| Goodharts | County of Union | 18 | 0 | 0 |