North Castle Water District #1, NY
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About North Castle Water District #1
North Castle Water District #1 serves about 2,500 people through 696 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Westchester County, New York. EPA system ID: NY5903445; phone on file: 914-273-3000. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 1.5 ppb from 1.5 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for North Castle Water District #1 is 42.6 ppb across 6 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2023 | 1.5 ppb |
| 2020 | 1.7 ppb |
| 2017 | 1.5 ppb |
| 2016 | 3.2 ppb |
| 2016 | 42.6 ppb over 15 |
How North Castle Water District #1 compares
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. North Castle Water District #1's reported as 0 (not detected) sits at the 17th percentile in New York and the 32nd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Westchester County
89 other systems share Westchester County; 63 of them have a higher latest lead result than North Castle Water District #1. 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; Armonk, 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 North Castle Water District #1 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. The lead result guide covers how utilities pick the homes they sample. Why an old exceedance still matters: over the limit before, under it now.