Westchester County, NY Water Quality
Hudson Valley · County seat: White Plains. Find your water provider, locate your Consumer Confidence Report, and understand local water in Westchester County.
About Westchester County water
How water works in Westchester County
Westchester County (county seat: White Plains) mixes municipal water systems in its cities, villages, and denser towns with private wells that remain common in its more rural areas. Which setup you have — and therefore how you check your water — depends on your specific address, not just the county.
Here, drinking water comes from a mix of sources — Hudson River intakes, local and New York City watershed reservoirs, and groundwater wells.
Your provider
Water system providers in Westchester County
In Westchester County, water is supplied by New York City DEP (via the Catskill/Delaware aqueducts and Kensico Reservoir), Westchester Joint Water Works, Veolia Water New York, and several municipal systems. One address can still fall within more than one system, so confirm the provider on a recent bill or with the official lookup tools below.
Water systems (federal records)
Community water systems serving Westchester County
Federal EPA drinking-water records list 92 active community water systems serving Westchester County, together reported to serve about 956,104 people. The largest are shown below (by population served). Click a PWS ID for that system's federal report.
| PWS ID | System | Primary source | Population served | Connections | Report |
|---|---|---|---|---|---|
| NY5903465 | Yonkers City | Purchased surface water | 211,569 | 30,000 | Official CCR ↗ |
| NY5903444 | Veolia Water New York, Inc. Rd-1 | Purchased surface water | 146,732 | 33,000 | Official CCR ↗ |
| NY5903441 | Mount Vernon Water Department | Purchased surface water | 73,893 | 10,172 | EPA report |
| NY5903435 | Westchester Joint Water Works | Surface water | 59,629 | 12,000 | EPA report |
| NY5903464 | White Plains City | Purchased surface water | 59,559 | 9,400 | EPA report |
| NY5903456 | Veolia Water New York, Inc. Rd-2 | Purchased surface water | 57,301 | 12,053 | EPA report |
| NY5903429 | Greenburgh Consolidated WD #1 | Purchased surface water | 39,993 | 10,475 | EPA report |
| NY5903469 | Yorktown Consold. Water Dist.#1 | Purchased surface water | 36,000 | 10,000 | EPA report |
| NY5903451 | Ossining Water Department | Surface water | 30,000 | 6,600 | EPA report |
| NY5903423 | Cortlandt Consolidated WD | Purchased surface water | 28,369 | 7,300 | EPA report |
| NY5903452 | Peekskill City | Surface water | 24,272 | 4,800 | EPA report |
| NY5903457 | Scarsdale Water Department | Purchased surface water | 21,649 | 5,800 | EPA report |
| NY5930082 | Kensico Water District | Purchased surface water | 17,917 | 5,119 | EPA report |
| NY5903442 | New Castle/Stanwood W.D. | Purchased surface water | 17,116 | 5,183 | EPA report |
| NY5903437 | Mount Kisco Water Department | Surface water | 11,187 | 2,700 | EPA report |
…and 77 more, mostly smaller community systems. Full federal records for every system are on EPA ECHO.
Source: EPA Safe Drinking Water Information System (SDWIS), pulled July 2026. Population and connection figures are SDWIS-reported estimates. This lists community systems only — it excludes private wells and transient systems. Confirm the exact system for an address on a water bill.
Compliance
Violations and notices in Westchester County
Of the 92 community water systems serving Westchester County, federal EPA records show 47 with at least one health-based violation on record over the years. A violation can range from a monitoring/reporting lapse to an exceedance that has since been resolved — open a system's federal report (linked in the table above) or its current Consumer Confidence Report for the specifics and current status.
Water characteristics
What Westchester County water is typically like
Hudson Valley water hardness varies widely by source — reservoir-fed systems tend to be soft, while groundwater wells can be moderately hard or high in iron and manganese. River-sourced systems focus on filtration and disinfection-byproduct control.
Regional patterns are a general guide only — hardness, iron, and other traits vary by specific system and well. Your CCR (or a well test) is the authoritative source for your address.
Reported contaminant levels
Yonkers City — reported levels (2025 report)
Selected regulated contaminants from this system's official Consumer Confidence Report. "Below/At/Above" compares the reported value to its limit; it does not replace the utility's formal compliance determination.
| Contaminant | Reported level | Limit | vs. limit | Sample yr |
|---|---|---|---|---|
| Lead (90th percentile) 90th %ile of 50 sites; below 15 AL — VERIFY (layout dense) | 11.3 ppb | 15 ppb (Action level) | Below | 2025 |
| Copper (90th percentile) 90th %ile; range from 0.0425; below 1.3 AL | 0.28 ppm | 1.3 ppm (Action level) | Below | 2025 |
| Nitrate range 0.149-0.193 mg/L (May 2025) | 0.19 ppm | 10 ppm (MCL) | Below | 2025 |
| Total Trihalomethanes (TTHM) highest locational; range 14.1-53.3; below 80 | 53.3 ppb | 80 ppb (MCL) | Below | 2025 |
| Total Coliform 3.75% of samples positive — below the 5% standard; no violation | 3.75% positive presence | — | — | 2025 |
| PFOA ND | Non-Detect | 10 ppt (MCL (NY)) | Below | 2025 |
Values transcribed from the official CCR (source ↗) as a first-pass reading — always confirm against the full report, which lists every monitored contaminant, ranges, and footnotes. Lead/copper are 90th-percentile action-level results. This is a partial panel; absence of a contaminant here does not mean it wasn't tested.
Reported contaminant levels
Veolia Water New York, Inc. Rd-1 — reported levels (2025 report)
Selected regulated contaminants from this system's official Consumer Confidence Report. "Below/At/Above" compares the reported value to its limit; it does not replace the utility's formal compliance determination.
| Contaminant | Reported level | Limit | vs. limit | Sample yr |
|---|---|---|---|---|
| Lead (90th percentile) 90th %ile ~2 ppb; report notes 4 of 50 sites — VERIFY; below 15 AL | 2 ppb | 15 ppb (Action level) | Below | 2025 |
| Copper (90th percentile) 90th %ile 0.02 mg/L; 0 of 50 sites over AL | 0.02 ppm | 1.3 ppm (Action level) | Below | 2025 |
| Turbidity max 1.40 NTU (Mar/Apr 2025); below 5 | 1.4 NTU | — | — | 2025 |
| Chlorine (residual) 0.70 mg/L | 0.7 ppm | 4.0 ppm (MRDL) | Below | 2025 |
Values transcribed from the official CCR (source ↗) as a first-pass reading — always confirm against the full report, which lists every monitored contaminant, ranges, and footnotes. Lead/copper are 90th-percentile action-level results. This is a partial panel; absence of a contaminant here does not mean it wasn't tested.
Small community systems (Veolia)
Veolia-operated small water systems in Westchester County
Westchester County includes a number of small community water systems operated by Veolia Water New York (serving individual developments, HOAs, and hamlets). Selected 2025 reported values from their official annual reports:
| System | Nitrate | Lead (sites > AL) | Copper (sites > AL) | Chlorine | Report |
|---|---|---|---|---|---|
| Heritage Hills | 1.01 mg/L | 1/22 over AL | 0/22 over AL | — | Report ↗ |
| Veolia Westchester District 2 | — | 2/62 over AL | 0/62 over AL | — | Report ↗ |
First-pass readings from each system's official Veolia annual water quality report (linked) — confirm against the source. Lead/copper columns show the number of sampled sites above the action level (15 ppb lead / 1.3 ppm copper); "0 over AL" means compliant. Nitrate MCL is 10 mg/L. These are small groundwater systems; values are system-specific.
PFAS monitoring (EPA UCMR5)
PFAS monitoring results in Westchester County
Under the EPA's fifth Unregulated Contaminant Monitoring Rule (UCMR5), 29 water systems in Westchester County tested for 29 PFAS compounds and lithium in 2023–2025. Of those, 9 had at least one PFAS detection, and 8 had a detection of PFOA or PFOS (the two PFAS New York regulates most strictly).
| System | PFOA (ppt) | PFOS (ppt) | Other PFAS detected | Latest sample |
|---|---|---|---|---|
| Pequenakonck Elementary School | 111.5 | 10 | 6 | 8/26/2025 |
| Yeshiva Farm Settlement | 27.8 | 106 | 8 | 8/30/2023 |
| Somers Town House/Hall | 21 | 54.7 | 5 | 5/21/2024 |
| Yorktown Consold. Water Dist.#1 | 6.9 | — | 3 | 7/9/2024 |
| Heritage Hills Waterworks Corp | 6.6 | 6.1 | — | 8/19/2024 |
| Suez Water Westchester, Inc. Rd2 | 6.5 | — | 2 | 8/26/2025 |
| Ossining Water Department | 4.3 | — | — | 1/17/2024 |
| Bedford Consolidated W.D. | 4.1 | — | 1 | 8/11/2025 |
How to read this: These are occurrence-monitoring results, not compliance determinations. New York's enforceable limit (MMCL) is 10 ppt each for PFOA and PFOS; a monitoring result above that is a signal to look closer, not automatically a violation — and a system may have added treatment or changed sources since it was sampled. Values are the highest detected at any sampling point, in parts per trillion (ppt). Always check the system's current Consumer Confidence Report for its latest status. Source: EPA UCMR5 (data collected 2023–2025). See PFAS explained and NY drinking water standards.
Read the fine print
What these records don't show
The system and compliance records above come from federal data. Some things people ask about are not captured here and should be confirmed directly:
- Contaminant levels at your tap. Actual values (lead, PFAS, nitrate, disinfection byproducts, etc.) come only from your system's Consumer Confidence Report or your own well test — we do not publish or estimate them.
- Water hardness. Not in the federal system records. Ask your utility for the CCR hardness value or use a home hardness test. See our hard-water guide.
- Taste, odor, color, and staining. These aesthetic issues are not standardized here; your CCR's secondary-contaminant notes and your own observations are the best guide.
- Year-over-year change. We don't track how a system's results changed from last year — compare this year's CCR to last year's using the report links.
Detailed local guides
Town & city water guides in Westchester County
Deeper guides naming the specific water provider and local context for each place:
White Plains · Yonkers · New Rochelle · Mount Vernon · Scarsdale · Rye · Harrison · Mamaroneck · Port Chester · Ossining · Peekskill · Yorktown · Cortlandt · Bedford · Tarrytown · Dobbs Ferry · Hastings-on-Hudson · Pleasantville · Mount Kisco · Katonah · Croton-on-Hudson · Larchmont · Bronxville · Elmsford · Sleepy Hollow · Somers
Find your report
How to find your water provider and report
- Check a recent water bill for your water system or district name.
- Look up that system and its most recent Consumer Confidence Report (CCR) using the official tools below.
- On a private well? A CCR won't apply — see our private well testing guide.
Confirm it's your water
Make sure a report is actually yours
- Find the provider name and PWS ID printed on your water bill — a town name or ZIP alone is not enough to identify the system.
- Match that PWS ID to the systems table above (or search it on EPA ECHO).
- Open that system's current CCR for the official results and any notices.
- For a point-of-use concern (especially lead), use a certified laboratory test for your specific tap — the system-wide report can meet standards while an individual older home does not.
Lead & older homes
Lead and service lines in Westchester County
Lead is almost never in the water leaving a treatment plant — it typically enters from a lead service line or older home plumbing. A system-wide CCR can meet the lead action level while an individual older home shows a higher result at the tap. New York requires public water systems to inventory their lead service lines, so ask your utility for its inventory, and confirm your own tap with a certified laboratory test. See our lead & copper guide and utility report vs. home tap test.
Communities
Cities, towns, villages, and hamlets in Westchester County
Local guidance in Westchester County is most relevant to these cities, towns, villages, and hamlets:
- White Plains
- Yonkers
- New Rochelle
- Mount Vernon
- Greenburgh
- Scarsdale
- Rye
- Harrison
- Mamaroneck
- Port Chester
- Ossining
- Peekskill
- Yorktown
- Cortlandt
- Mount Pleasant
- Bedford
- New Castle (Chappaqua)
- Tarrytown
- Dobbs Ferry
- Hastings-on-Hudson
- Pleasantville
- Mount Kisco
- Katonah
- Croton-on-Hudson
- Larchmont
- Bronxville
- Elmsford
- Sleepy Hollow
- Somers
- Pound Ridge
Representative ZIP codes
A sample of ZIP codes in Westchester County (not a complete list; one ZIP can span multiple systems):
- 10601
- 10603
- 10604
- 10605
- 10606
- 10607
- 10701
- 10703
- 10704
- 10705
- 10706
- 10707
- 10708
- 10709
- 10710
- 10801
- 10804
- 10805
- 10550
- 10552
- 10553
- 10583
- 10573
- 10528
- 10538
- 10543
- 10562
- 10566
- 10570
- 10510
- 10514
- 10522
- 10523
- 10530
- 10532
- 10533
- 10536
- 10547
- 10548
- 10549
- 10560
- 10562
- 10566
- 10567
- 10570
- 10573
- 10576
- 10577
- 10580
- 10583
- 10588
- 10589
- 10590
- 10591
- 10594
- 10595
- 10596
- 10597
- 10598
Improve your water
Common Westchester County home water steps
Test & understand
Start with your CCR (or a well test), then read how to read a water quality report.
Treat the right problem
A clean report often means no equipment is needed. For a confirmed concern, match it to options with our treatment decision matrix — treatment guidance is separate from the regulatory info above and is not a recommendation to buy anything.
Schools & facilities
New York public schools must test for lead — see the NY school lead testing overview.
Get local help
Have a specific question about your Westchester County water? Contact us and we'll point you to the right next step.
Authoritative resources
Official & academic water resources for Westchester County
For primary data and research beyond this guide, these New York agencies and universities are the authoritative sources:
FAQ
Frequently asked questions
Who provides drinking water in Westchester County?
New York City DEP (via the Catskill/Delaware aqueducts and Kensico Reservoir), Westchester Joint Water Works, Veolia Water New York, and several municipal systems. Federal records list 92 active community water systems in the county. Check a recent water bill or the lookup tools to confirm the exact system serving your address.
How do I find my water quality report in Westchester County?
Every community water system must publish an annual Consumer Confidence Report (CCR). Identify your provider first, then request its current CCR from the provider or through NYSDOH. Private wells are not covered by a CCR and must be tested independently.
Is Westchester County water hard or soft?
Hudson Valley water hardness varies widely by source — reservoir-fed systems tend to be soft, while groundwater wells can be moderately hard or high in iron and manganese.
Are there water-quality violations in Westchester County?
Federal EPA records show 47 of the county's 92 community water systems with a health-based violation on record over the years; open a system's federal report or current CCR for status.
Does this page publish local test results?
No. We publish the systems, sources, and compliance records that come from federal data, but not address-level contaminant values — those come only from each provider's official CCR and the NYS Department of Health.
NY Water Quality Guide is an independent educational resource and is not affiliated with any government agency or utility. System and compliance data on this page come from the EPA Safe Drinking Water Information System (federal records) and describe general Westchester County water; the page does not publish address-level contaminant test results. Confirm current conditions in your provider's latest Consumer Confidence Report or with the NYS Department of Health.
Last reviewed: July 2026