Cotswold Water Supply, NY
Exceeded the action level in the past
Latest 90th-percentile lead: 2.2 ppb (monitoring period 2026-2026). 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.
Cotswold Water Supply at a glance
Cotswold Water Supply serves about 150 people through 38 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Westchester County, New York. EPA system ID: NY5920706; phone on file: 914-639-4099. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Cotswold Water Supply's lead record
That is down 1.1 ppb from 3.3 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Cotswold Water Supply is 65.1 ppb across 19 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.2 ppb |
| 2025 | 3.3 ppb |
| 2025 | 3.1 ppb |
| 2024 | 3.5 ppb |
| 2024 | 5.6 ppb |
| 2023 | 5.7 ppb |
| 2023 | 3.2 ppb |
| 2022 | 5.8 ppb |
| 2022 | 5.6 ppb |
| 2021 | 14.8 ppb over 10 |
| 2021 | 6.5 ppb |
| 2020 | 13.4 ppb over 10 |
| 2020 | 8.21 ppb |
| 2019 | 20.83 ppb over 15 |
| 2018 | 7.6 ppb |
| 2017 | 5.57 ppb |
| 2016 | 6.84 ppb |
| 2016 | 65.1 ppb over 15 |
| 2016 | 4.77 ppb |
How Cotswold Water Supply 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. Cotswold Water Supply's 2.2 ppb sits at the 63rd percentile in New York and the 75th nationally (higher means more lead).
Nearby utilities
89 other systems share Westchester County; 28 of them have a higher latest lead result than Cotswold Water Supply. 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 |
Next steps for Yorktown Heights, NY
Test your own tap with a certified lab first-draw sample; Yorktown Heights, 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 Cotswold Water Supply 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.