New York water quality
New York has 7,788 active public water systems (24,703 on file total), 2,203 of them graded by TapGraded.
Grade distribution
Biggest water systems
NEW YORK CITY SYSTEM
VALHALLA, NY · 8,271,000 served
SUFFOLK COUNTY WATER AUTHORITY
HAUPPAUGE, NY · 1,100,000 served
MCWA
ROCHESTER, NY · 525,262 served
OCWA
SYRACUSE, NY · 350,000 served
ECWA DIRECT
BUFFALO, NY · 313,380 served
BUFFALO WATER AUTHORITY
BUFFALO, NY · 276,000 served
VEOLIA WATER NEW YORK
WEST NYACK, NY · 270,000 served
LIBERTY UTILITIES NEW YORK - LYNBROOK
MERRICK, NY · 220,000 served
YONKERS CITY
YONKERS, NY · 211,569 served
ROCHESTER CITY
ROCHESTER, NY · 210,000 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
SYRACUSE CITY
SYRACUSE, NY · 192,000 served
WATERTOWN CITY
WATERTOWN, NY · 27,861 served
LIBERTY UTILITIES NEW YORK - LYNBROOK
MERRICK, NY · 220,000 served
DUNKIRK CITY
DUNKIRK, NY · 12,743 served
CORNING CITY
CORNING, NY · 10,300 served
NYACK VILLAGE WATER SUPPLY
NYACK, NY · 14,700 served
SCOTIA VILLAGE WATER WORKS
SCOTIA, NY · 12,800 served
ROCHESTER CITY
ROCHESTER, NY · 210,000 served
RIVERHEAD WATER DISTRICT
RIVERHEAD, NY · 35,000 served
GARDEN CITY (V)
GARDEN CITY, NY · 23,272 served
Cities in New York
Source: EPA SDWIS/ECHO · Data as of 2026Q2