County · New York
Westchester County, New York: drinking water records
Explore EPA records for 92 community water systems across 74 ZIP codes in Westchester County, then find water-testing resources and available recent monitoring-station readings.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 27 of the 92 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems in this county
All 92 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Westchester Joint Water Works NY5903435 | 59,629 | 240 | 0 | 3 | 3.3 ppbbelow the action level |
| Yorktown Consold. Water Dist.#1 NY5903469 | 36,000 | 240 | 4 | 4 | 1.2 ppbbelow the action level |
| Kensico Water District NY5930082 | 17,917 | 120 | 0 | 6 | 2.4 ppbbelow the action level |
| Mount Kisco Water Department NY5903437 | 11,187 | 180 | 1 | 1 | 1 ppbbelow the action level |
| Tarrytown Water Supply NY5903461 | 11,000 | 120 | 0 | 3 | 4.4 ppbbelow the action level |
| Westchester County WD #3 NY5903482 | 6,000 | 120 | 0 | 2 | 0 ppbbelow the action level |
| Yonkers City NY5903465 | 211,569 | 240 | 0 | 0 | 4.3 ppbbelow the action level |
| Veolia Water New York, INC. Rd-1 NY5903444 | 146,732 | 120 | 0 | 0 | 5 ppbbelow the action level |
| Greenburgh Consolidated WD #1 NY5903429 | 86,624 | 120 | 0 | 0 | 1.3 ppbbelow the action level |
| Mount Vernon Water Department NY5903441 | 73,893 | 240 | 0 | 0 | 2.5 ppbbelow the action level |
| White Plains City NY5903464 | 59,559 | 240 | 0 | 0 | 1.3 ppbbelow the action level |
| Veolia Water New York, INC. Rd-2 NY5903456 | 57,301 | 240 | 3 | 0 | 2 ppbbelow the action level |
| Ossining Water Department NY5903451 | 30,000 | 120 | 1 | 0 | 3 ppbbelow the action level |
| Cortlandt Consolidated WD NY5903423 | 28,369 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Peekskill City NY5903452 | 24,272 | 120 | 0 | 0 | 1.3 ppbbelow the action level |
| Scarsdale Water Department NY5903457 | 21,649 | 240 | 0 | 0 | 6.2 ppbbelow the action level |
| New Castle/Stanwood W.D. NY5903442 | 17,116 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Sleepy Hollow (Village) NY5903450 | 9,870 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Pleasantville Water District NY5903455 | 9,550 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Briarcliff Manor Village NY5903420 | 9,190 | 120 | 0 | 0 | 3.2 ppbbelow the action level |
| Bedford Consolidated W.D. NY5903419 | 9,056 | 240 | 2 | 0 | 2 ppbbelow the action level |
| Croton on Hudson Village NY5903425 | 8,000 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Irvington Water Supply NY5903432 | 6,631 | 120 | 0 | 0 | 1 ppbbelow the action level |
| Larchmont Village NY5903433 | 6,485 | 120 | 0 | 0 | 6 ppbbelow the action level |
| Elmsford Village NY5903427 | 5,293 | 120 | 0 | 0 | 1.8 ppbbelow the action level |
| Heritage Hills Water System NY5917221 | 4,700 | 60 | 2 | 0 | 9.6 ppbbelow the action level |
| Old Farm Hill Water District NY5903485 | 1,768 | 0 | 0 | 3 | 2.7 ppbbelow the action level |
| Oakridge Water District NY5918395 | 892 | 0 | 0 | 2 | 3.1 ppbbelow the action level |
| Pocantico Hills Water District NY5903472 | 329 | 0 | 0 | 9 | 0 ppbbelow the action level |
| Indian Hill Subdivision NY5918382 | 320 | 0 | 0 | 7 | 3 ppbbelow the action level |
| Yeshiva Farm Settlement NY5903150 | 300 | 120 | 10 | 0 | 1.6 ppbbelow the action level |
| Pabst Water District NY5903470 | 253 | 0 | 0 | 1 | 4 ppbbelow the action level |
| Bridleside Apartments NY5930137 | 230 | 0 | 0 | 2 | 0.6 ppbbelow the action level |
| Croton Falls Water District NY5903424 | 216 | 0 | 0 | 1 | 7.8 ppbbelow the action level |
| Hunt Farm Water Company NY5920064 | 156 | 0 | 0 | 2 | 1 ppbbelow the action level |
| Cotswold Water Supply NY5920706 | 150 | 0 | 0 | 2 | 2.2 ppbbelow the action level |
| Salem Acres Assoc NY5903466 | 138 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Sunshine Childrens Home & Rehab Center NY5910495 | 130 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Forest Park Water Co Plant #3 NY5903487 | 67 | 0 | 0 | 1 | 14 ppbbelow the action level |
| Waccabuc Farms INC. NY5903769 | 26 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Westchester County WD #1 NY5903488 | 0 | 0 | 0 | 2 | 13 ppbbelow the action level |
| Somers Consolidated Water District #1 NY5903426 | 3,848 | 0 | 0 | 0 | 11 ppbbelow the action level |
| Montrose Improvement District NY5903436 | 3,100 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Pace University NY5907678 | 2,753 | 0 | 0 | 0 | 0 ppbbelow the action level |
| North Castle Water District #1 NY5903445 | 2,500 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Buchanan Village NY5903422 | 2,200 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Old Post Road Water District NY5930061 | 1,500 | 0 | 0 | 0 | 8 ppbbelow the action level |
| North Castle Water District #4 NY5922909 | 1,225 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| North Castle Water District #2 NY5903446 | 1,200 | 0 | 0 | 0 | 3.5 ppbbelow the action level |
| Greenbriar Subdivision NY5918381 | 956 | 0 | 0 | 0 | 3.4 ppbbelow the action level |
| Wild Oaks Water Company NY5903479 | 805 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Khal Adas Kashau NY5903154 | 650 | 0 | 0 | 0 | 2.3 ppbbelow the action level |
| Meadows at Cross River NY5920685 | 630 | 0 | 0 | 0 | 5.2 ppbbelow the action level |
| Sunset Ridge Water District NY5905657 | 625 | 0 | 0 | 0 | 7.8 ppbbelow the action level |
| Bear Ridge Lake Water District NY5903438 | 518 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harvey School NY5912829 | 510 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Lincoln Hall School NY5903156 | 500 | 0 | 0 | 0 | 10.7 ppbbelow the action level |
| Dykeer Water Co. NY5920065 | 480 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Four Winds Hospital NY5930031 | 400 | 0 | 0 | 0 | 7.9 ppbbelow the action level |
| The Paramount at Somers Rehab Center NY5910496 | 400 | 0 | 0 | 0 | 42 ppbat or above the action level |
| Truesdale Corporation NY5903468 | 400 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Twin Lakes Water Co., INC. NY5903475 | 366 | 0 | 0 | 0 | 0.0 ppbbelow the action level |
| Lake Katonah Club INC NY5903476 | 356 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Michelle Estates NY5930013 | 340 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Pietsch Gardens NY5903467 | 337 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Bloomerside Water Supply NY5903448 | 300 | 0 | 0 | 0 | 5.8 ppbbelow the action level |
| The Farms Water District NY5903418 | 300 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Goldens Bridge Community Assoc NY5903428 | 250 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| North Castle Water District #5 NY5903492 | 225 | 0 | 0 | 0 | 2.2 ppbbelow the action level |
| Somers Chase Water Works Corp NY5930049 | 224 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Cale Farms Water Works NY5922908 | 212 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Applehill Farm Water District NY5917105 | 209 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cedar Downs Water District NY5903478 | 195 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Arbor Hills Water Works NY5922910 | 180 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Salem Chase NY5930027 | 175 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Lewisboro Commons NY5930083 | 168 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kitchawan Water District NY5903831 | 150 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Yeshiva Kehileth Yakov NY5920450 | 150 | 0 | 0 | 0 | 1.2 ppbbelow the action level |
| Candlewood Park Water District NY5903449 | 125 | 0 | 0 | 0 | 8.8 ppbbelow the action level |
| Keeler Field NY5906656 | 100 | 0 | 0 | 0 | 16.7 ppbat or above the action level |
| Pleasant Ridge Water District NY5920776 | 95 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Meadowbrook Water District NY5903439 | 91 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ramleh Water Works Corp. INC. NY5922912 | 80 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Mill River Water District NY5931080 | 74 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pleasantville Road Water District NY5930081 | 56 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pleasantville Extension #1 NY5917106 | 49 | 0 | 0 | 0 | 4.2 ppbbelow the action level |
| Juengstville Farm Association NY5916740 | 45 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bedford Golf and Tennis Club NY5905442 | 44 | 0 | 0 | 0 | 0 ppbbelow the action level |
| 796 Bedford Road Apartments NY5930069 | 40 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Saint Nersess Armenian Seminary NY5930011 | 32 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Northern Westchester Joint Water Works NY5930056 | 0 | 0 | 0 | 0 | 13 ppbbelow the action level |
| Westchester County WD #2 NY5903489 | 0 | 0 | 0 | 0 | not reported |
Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. 2 systems in this table are at or above it. What an action level means
USGS · Monitoring stations
The water, more recently.
Available station readings in Westchester County, New York. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in Westchester County
74ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Ardsley
- Armonk
- Bedford
- Bedford Hills
- Briarcliff Manor
- Buchanan
- Chappaqua
- Crompond
- Croton-on-Hudson
- Dobbs Ferry
- Eastchester
- Elmsford
- Fairview
- Golden's Bridge
- Harrison
- Hartsdale
- Hastings-on-Hudson
- Hawthorne
- Heritage Hills
- Irvington
- Jefferson Valley-Yorktown
- Lake Mohegan
- Larchmont
- Mamaroneck
- Millwood
- Montrose
- Mount Kisco
- Mount Vernon
- New Rochelle
- Ossining
- Peach Lake
- Peekskill
- Pelham Manor
- Pleasantville
- Rye
- Rye Brook
- Scarsdale
- Scotts Corners
- Shrub Oak
- Tarrytown
- Thornwood
- Valhalla
- Verplanck
- White Plains
- Yonkers
View ZIP areas and understand coverage
- 10501
- 10502Ardsley
- 10503Irvington
- 10504Armonk
- 10505
- 10506Bedford
- 10507Bedford Hills
- 10510Briarcliff Manor
- 10511Buchanan
- 10514Chappaqua
- 10517
- 10518
- 10519
- 10520Croton-on-Hudson
- 10522Dobbs Ferry
- 10523Elmsford
- 10526Golden's Bridge
- 10527
- 10528Harrison
- 10530Hartsdale
- 10532Hawthorne
- 10533Irvington
- 10535Jefferson Valley-Yorktown
- 10536Golden's Bridge
- 10538Larchmont
- 10540
- 10543Mamaroneck
- 10545
- 10546Millwood
- 10547Lake Mohegan
- 10548Montrose
- 10549Mount Kisco
- 10550Mount Vernon
- 10552Mount Vernon
- 10553Mount Vernon
- 10560Peach Lake
- 10562Ossining
- 10566Peekskill
- 10567Crompond
- 10570Pleasantville
- 10573Rye Brook
- 10576Scotts Corners
- 10577Harrison
- 10578
- 10580Rye
- 10583Scarsdale
- 10588Shrub Oak
- 10589Heritage Hills
- 10590
- 10591Tarrytown
- 10594Thornwood
- 10595Valhalla
- 10596Verplanck
- 10597
- 10598Jefferson Valley-Yorktown
- 10601White Plains
- 10603White Plains
- 10604Harrison
- 10605White Plains
- 10606White Plains
- 10607Fairview
- 10701Yonkers
- 10703Yonkers
- 10704Yonkers
- 10705Yonkers
- 10706Hastings-on-Hudson
- 10707Yonkers
- 10708Yonkers
- 10709Eastchester
- 10710Yonkers
- 10801New Rochelle
- 10803Pelham Manor
- 10804New Rochelle
- 10805New Rochelle
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.