PFOA
Not detected above reporting limit
- Sample date
- Reporting limit
- 0.004 µg/L
- Sample ID
- 380-128435-1
PUBLIC WATER SYSTEM
New York City Water Supply
Water testing, compliance records and water sources for this system. Check your utility bill to confirm your provider.
NY7003493Open in the atlas →Public drinking-water record
Drinking-water testing
New York City Water Supply · NY7003493. These are public water-system records, not a test of the tap water at your home.
PFAS testing
No PFAS detection above the reporting limit in these results. Most recent PFAS sample shown here: .
PFOS
Not detected above reporting limit
- Sample date
- Reporting limit
- 0.004 µg/L
- Sample ID
- 380-128435-1
Selected latest compound samples from the published federal system record. Multiple sample points may share a date. A detection does not establish a violation. A non-detection does not mean PFAS-free. PFOA and PFOS limits and regulatory context are separate from these historical samples.
Lead and copper
Lead: 0.01 mg/L, period ending 2024-12-31. These are system 90th-percentile results, not individual household concentrations.
Drinking-water compliance
Current treatment-technique violation reported. 1 current flags and 24 historical records in the federal publication dated September 1, 2026. Historical records are not all active violations.
EPA UCMR5 source and sampling program · EPA ECHO compliance and lead/copper records
Drinking water & contaminants
Drinking-water testing and compliance
Compliance records, PFAS sampling, and lead and copper results answer different questions. None is a test of a particular home's faucet.
Recency unconfirmed · Date unavailableEPA ECHO / SDWIS federal snapshot
The source does not provide a publication date. The last check date is not recorded. This report may not describe conditions today.
EPA ECHO / SDWIS · 2026 Q2 snapshot
Current treatment-technique violation reported
1 current regulatory record appear in the federal snapshot.
- People served
- 8,271,000
- Historical records
- 24
- Source type
- Surface water
Compliance history
24 violation records
Federal and primacy-agency regulatory history reported in EPA ECHO/SDWIS; not a household tap-water test.
PFAS / UCMR5
No PFAS detection above the reporting limit in these results
464 compound results in the 2023–2026 UCMR5 final release. Non-detection means not detected above the reporting limit in that sample—not that PFAS never occurs.
Lead & copper
36 system-level results
System-level lead/copper 90th-percentile reporting; not the lead or copper level at a particular faucet. This system-wide inventory does not identify the pipes at your address.
Consumer Confidence Report
Find your annual water-quality report
Your utility’s annual Consumer Confidence Report describes its water sources and testing results. Contact the utility for its latest report.
Learn about annual water-quality reportsMeasurement coverage
No measurements available here
We do not have measurements to show for New York City Water Supply in this section. Explore the connections below for related waters and water providers.
No measurement history available here
We do not have historical measurements to show for New York City Water Supply. This does not mean it is unmonitored or that its water is safe or unsafe. You can still explore the information and source links on this page.
The local measurements below and the federal records above may cover different sites and dates. Some results may overlap, so do not add their counts together.
Rivers, lakes & drinking water
Local monitoring and source water
Explore river and lake assessments, measurements taken nearby, drinking-water tests and dams. Each tells you something different about the area.
Official surface-water assessments
Assessment results vary
14 EPA water assessments are linked to this local watershed (HUC12).
0 supporting11 impaired3 unknown
See assessed waters and official status
Hudson River (lower)impaired · reporting cycle 2022
Not Supporting
EPA waterbody recordUpper NY Bay / Kill Van Kull (74d07m30s)impaired · reporting cycle 2022
Not Supporting
EPA waterbody recordHudson River (Class SB), portionimpaired · reporting cycle 2022
Not Supporting
EPA waterbody recordHudson River (Class I)impaired · reporting cycle 2022
Not Supporting
EPA waterbody recordJerome Park Reservoirunknown · reporting cycle 2022
Not Assessed
EPA waterbody recordHarlem Meerimpaired · reporting cycle 2022
Not Supporting
EPA waterbody recordCentral Park Reservoirunknown · reporting cycle 2022
Not Assessed
EPA waterbody recordThe Lake in Central Parkimpaired · reporting cycle 2022
Not Supporting
EPA waterbody recordNewtown Creek and tidal tribsimpaired · reporting cycle 2022
Not Supporting
EPA waterbody recordRidgewood Reservoirunknown · reporting cycle 2022
Not Assessed
EPA waterbody recordUpper New York Bayimpaired · reporting cycle 2022
Not Supporting
EPA waterbody recordHarlem Riverimpaired · reporting cycle 2022
Not Supporting
EPA waterbody recordMonitoring activity
1,001 sites4,706 observations32 characteristics
Water Quality Portal measurements from the surrounding area. More measurements can mean more monitoring—not worse water.
metals minerals 88microbial 961nutrients 257physical field 2,222salinity basic chemistry 1,154unclassified 24
See recent measurement examples
Chlorophyll a7.3 ug/L · 2026-04-28
Chlorophyll a15.2 ug/L · 2026-04-28
Dissolved oxygen saturation72.8 % · 2026-04-28
Chlorophyll a5.6 ug/L · 2026-04-28
Dissolved oxygen saturation73.7 % · 2026-04-28
Dissolved oxygen saturation73.3 % · 2026-04-28
UCMR5 PFAS monitoring
0 reported detections
Across 480 compound results and 16 samples for this water system.
Detection is not the same as violation.A reported detection is not, by itself, a drinking-water violation or a statement about a household tap. EPA states UCMR results do not indicate compliance or noncompliance with PFAS MCLs.
Nearby dam inventory
413 nearby dam records
These dams are nearby, but may not supply your drinking water. Hazard potential describes the consequences of a failure; condition describes the dam itself.
Hackensack Res. # 2 (Weehawken) Dam →3.73 mi away · NJ01011HazardHighConditionFair
New Central Park Receiving Res Dam →5.3 mi away · NY00188HazardHighConditionSatisfactory
Ridgewood Reservoir Dam →6.55 mi away · NY00160HazardLowConditionNot Rated
Silver Lake Reservoir Dam →7.34 mi away · NY00060HazardHighConditionSatisfactory
Bellman Br. Bleachery Dam →7.63 mi away · NJ00850HazardLowConditionnot public/stated
Water sources
Where the water comes from
New York City Water Supply receives water from Croton Aqueduct, Delaware Aqueduct, and Catskill Aqueduct, according to the source records.
The links show sources and suppliers, not the amount being delivered today. Select one for its source record.
Some sources identifiedSource coverage does not measure water quality or reliability.
Your water system
How it reaches the region
Further upstream
Sources and relationships as a list
Documented current sources or suppliers for New York City Water Supply include Croton Aqueduct, Delaware Aqueduct and Catskill Aqueduct. A relationship does not by itself establish the current delivered amount.
- New York City Water Supply supplied by Croton Aqueduct. Current. The relationship is documented; a current delivered amount is not available.
- New York City Water Supply supplied by Delaware Aqueduct. Current. The relationship is documented; a current delivered amount is not available.
- New York City Water Supply supplied by Catskill Aqueduct. Current. The relationship is documented; a current delivered amount is not available.
- Croton Aqueduct conveys water from Croton water-supply system. Current. The relationship is documented; a current delivered amount is not available.
- Delaware Aqueduct conveys water from Delaware water-supply system. Current. The relationship is documented; a current delivered amount is not available.
- Catskill Aqueduct conveys water from Catskill water-supply system. Current. The relationship is documented; a current delivered amount is not available.
Water source types explained
Surface waterWater drawn from rivers, lakes, or reservoirs.
GroundwaterWater pumped from aquifers—bodies of rock or sediment that store and transmit groundwater, not underground lakes.
Wholesale waterA regional supplier can supply your local provider without serving your household directly.
Imported waterYour drinking-water source basin can differ from the watershed where you live.
Connected water system
Croton Aqueduct · Detail page unavailable
Delaware Aqueduct · Detail page unavailable
Catskill Aqueduct · Detail page unavailable