| Index | Water Mill | New York | National |
| Average Test Scores | n/a | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | n/a | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Water Mill | New York | National |
| Completed 8th grade | 96.9% | 83.5% | 84.3% |
| Completed high school | 96.4% | 82.1% | 83.0% |
| Completed some college | 78.7% | 59.5% | 59.4% |
| Completed associate degree | 65.9% | 43.4% | 38.5% |
| Completed bachelors | 59.5% | 34.7% | 30.3% |
| Completed masters | 31.5% | 15.1% | 11.5% |
| Completed professional degree | 12.4% | 4.2% | 3.3% |
| Completed doctorate | 2.1% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Water Mill. Using the proficiency score averages, the average test scores for Water Mill, NY schools is n/a. The average student to teacher ratio is n/a. In Water Mill, NY, an average of 96.9% of students have completed 8th grade and an average of 96.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Amagansett, NY | 510 | 80% | 66.7% |
| Quogue, NY | 600 | 80% | 66.7% |
| Mattituck, NY | 4,898 | 77% | 60.4% |
| Sag Harbor, NY | 1,959 | 65% | 34.4% |
| East Hampton, NY | 920 | 63% | 31.0% |
| Water Mill, NY | 1,860 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Port Henry, NY | 1,859 | 48% | 0.5% |
| Marriott-Slaterville, UT | 1,862 | 35% | 27.1% |
| Capac, MI | 1,858 | 40% | 16.3% |
| Orwell, OH | 1,862 | 65% | 34.4% |
| Harbor Beach, MI | 1,862 | 52% | 7.6% |
| Water Mill, NY | 1,860 | n/a |
Here are the best places to live in New York
Most Dangerous Cities In The US
See the best places to live in Water Mill
Check out the 10 most dangerous cities in New York