Greenbriar Subdivision, NY
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 10.3 ppb (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Greenbriar Subdivision at a glance
Greenbriar Subdivision serves about 956 people through 242 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Westchester County, New York. EPA system ID: NY5918381; phone on file: 914-277-3652. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 6.9 ppb from 3.4 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Greenbriar Subdivision is 10.3 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 10.3 ppb over 10 |
| 2023 | 3.4 ppb |
| 2020 | 3.26 ppb |
| 2017 | 5 ppb |
Where this result ranks
Of the 2,077 New York systems with a lead result, the median latest reading is 1.5 ppb; 17 are over 15 ppb right now and 165 have gone over at some point. Greenbriar Subdivision's 10.3 ppb sits at the 97th percentile in New York and the 97th nationally (higher means more lead).
Neighbouring systems
89 other systems share Westchester County; 6 of them have a higher latest lead result than Greenbriar Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Yonkers City | 211,569 | 7.14 ppb |
| Veolia Water New York, Inc. Rd-1 | 146,732 | 12.2 ppb |
| Mount Vernon Water Department | 73,893 | 7.12 ppb |
| Westchester Joint Water Works | 59,629 | 3 ppb |
| White Plains City | 59,559 | 1.25 ppb |
| Veolia Water New York, Inc. Rd-2 | 57,301 | 2 ppb |
| Greenburgh Consolidated Wd #1 | 43,312 | 1.29 ppb |
| Yorktown Consold. Water Dist.#1 | 36,000 | 1.2 ppb |
| Ossining Water Department | 30,000 | 3 ppb |
| Cortlandt Consolidated Wd | 28,369 | 1.4 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Somers, NY may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Greenbriar Subdivision whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. This system is in the band the 2027 10 ppb rule changes.