We found 40 public water systems that could serve the same population as Wampus School (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| North Castle Wd #1 | North Castle | 2,500 | 0 | 2 |
| North Castle Wd #4 | North Castle | 2,200 | 0 | 2 |
| North Castle Wd #2 | North Castle | 1,200 | 0 | 1 |
| Byram Hills High School | North Castle | 1,000 | 0 | 108 |
| H C Crittenden Middle School | North Castle | 748 | 0 | 0 |
| Breezemont Day Camp | North Castle | 550 | 0 | 0 |
| North Castle Pool &tennis Club | North Castle | 400 | 0 | 6 |
| Boces Rye Lake Campus | North Castle | 300 | 0 | 0 |
| Cranberry Lake | North Castle | 250 | 0 | 4 |
| North Castle Wd #5 | North Castle | 225 | 0 | 0 |
| Church Of St. Patrick | North Castle | 200 | 0 | 1 |
| Armonk Tennis Club | North Castle | 200 | 0 | 9 |
| Ramada Inn N/k/a Wellesley Inn | North Castle | 200 | 0 | 0 |
| 10 New King Street Associates | North Castle | 170 | 0 | 39 |
| Heraeus Kulzer, Inc. | North Castle | 165 | 0 | 0 |
| Safe Flight Instrument Corporation | North Castle | 120 | 0 | 0 |
| Modern Barn | North Castle | 101 | 0 | 0 |
| Aero Hardware & Parts Co., Inc | North Castle | 100 | 0 | 0 |
| 200 Business Park Drive | North Castle | 100 | 0 | 0 |
| Cinemagnetics Co.,inc. | North Castle | 100 | 0 | 0 |
| North Castle Wd #7 | North Castle | 100 | 0 | 0 |
| Grand Slam Banksville | North Castle | 100 | 0 | 0 |
| Hillside Church Of The Cm & A | North Castle | 100 | 0 | 0 |
| La Cremaillere | North Castle | 100 | 0 | 0 |
| Tots And Toddlers Day Care | North Castle | 90 | 0 | 0 |
| 84 Business Park Drive | North Castle | 80 | 0 | 0 |
| Roe Co | North Castle | 75 | 0 | 0 |
| 80 Business Park Drive | North Castle | 71 | 0 | 0 |
| WORLDS BEST CHEESES | North Castle | 65 | 0 | 0 |
| Spm Co.,inc. | North Castle | 65 | 0 | 0 |
| Armonk Fire District #2 | North Castle | 60 | 0 | 0 |
| 2 Byram Brook Pl./samola | North Castle | 50 | 0 | 0 |
| Schultzes Cider Mill | North Castle | 50 | 0 | 0 |
| 28 Kaysal Court Office Bldg. | North Castle | 50 | 0 | 0 |
| Aerotech World Trade Corp | North Castle | 40 | 0 | 0 |
| St. Nersess Armenian Seminary | North Castle | 32 | 0 | 0 |
| Congregation Bnai Israel | North Castle | 30 | 0 | 0 |
| Nicks Corner Market/pirmar Food Corp. | North Castle | 25 | 0 | 0 |
| 1 - 3 New King Street | North Castle | 25 | 0 | 0 |
| Lombardi Park | North Castle | 25 | 0 | 0 |