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ZIP Code 11566 Water Quality
New York · 372,655 people served · 12 water systems
F
FailingZIP code 11566 is in New York and is a large city from a drinking-water-service perspective, with 372,655 people served by 12 EPA-registered public water systems. It corresponds to MERRICK.
Within ZIP code 11566, the EPA Safe Drinking Water Information System (SDWIS) records 32 health-based violations during the past five years across 12 water systems serving this postal area. The grade of F reflects the aggregate compliance pattern, not the current daily water quality.
Last updated: 2026-05-18 · Source: EPA SDWIS
ZIP Code Location
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Cities in ZIP 11566
Water Systems Serving 11566
LIBERTY UTILITIES NEW YORK - LYNBROOK
PWSID: NY2902835
220,000 served
LIBERTY UTILITIES NEW YORK - SEA CLIFF
PWSID: NY2902853
13,400 served
LIBERTY UTILITIES NEW YORK - MERRICK
PWSID: NY2902840
135,000 served
ARBOR HILLS WATER WORKS
PWSID: NY5922910
180 served
LIBERTY UTILITIES NEW YORK - MILL NECK
PWSID: NY2902838
280 served
DYKEER WATER CO.
PWSID: NY5920065
480 served
WILD OAKS WATER COMPANY
PWSID: NY5903479
805 served
HOEY-DE GRAW WATERWORKS
PWSID: NY5203353
50 served
SPRING GLEN LAKE
PWSID: NY5203335
68 served
KINGSVALE WATER CO
PWSID: NY5503392
600 served
MOUNT EBO WS
PWSID: NY3920885
1,500 served
WEST BRANCH ACRES
PWSID: NY3905692
292 served
About ZIP-code water data
Postal-code level water quality data is built up from the underlying water systems — multiple ZIPs may share a single utility, and a single ZIP can span multiple utilities. For property-level information, contact the specific utility serving your address. EPA data on this page was last refreshed on 2026-05-18.
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