| SUFFOLK COUNTY WATER AUTHORITY Groundwater | NY5110526 | 10 | 3 | |
| YESHIVA FARM SETTLEMENT GU | NY5903150 | 10 | 3 | |
| PEQUENAKONCK ELEMENTARY SCHOOL Groundwater | NY5907717 | 8 | 3 | |
| Veolia Water NY Groundwater | NY4303673 | 11 | 2 | |
| WA OF WESTERN NASSAU Groundwater | NY2902830 | 8 | 2 | |
| ALBERTSON WD Groundwater | NY2902815 | 7 | 2 | |
| NYACK VILLAGE WATER SUPPLY Surface Water | NY4303666 | 7 | 2 | |
| SOMERS TOWN HOUSE/HALL Groundwater | NY5906659 | 7 | 2 | |
| BRINKERHOFF WATER DISTRICT Groundwater | NY1302766 | 6 | 2 | |
| PORT WASHINGTON WD Groundwater | NY2912267 | 6 | 2 | |
| MONROE VILLAGE Surface Water | NY3503535 | 6 | 2 | |
| ST JAMES WATER DISTRICT Groundwater | NY5103266 | 6 | 2 | |
| MANHASSET LAKEVILLE WD Groundwater | NY2902836 | 5 | 2 | |
| SIDNEY VILLAGE Groundwater | NY1200270 | 4 | 2 | |
| MINEOLA (V) Groundwater | NY2902839 | 4 | 2 | |
| SUFFERN VILLAGE Groundwater | NY4303675 | 4 | 2 | |
| KINGSTON (CITY) WATER DISTRICT Surface Water | NY5503374 | 2 | 2 | |
| HERITAGE HILLS WATERWORKS CORP Groundwater | NY5917221 | 2 | 2 | |
| BINGHAMTON, CITY OF Groundwater | NY0301651 | 6 | 1 | |
| SCOTIA VILLAGE WATER WORKS Groundwater | NY4600071 | 6 | 1 | |
| CHENANGO CONSOLIDATED WD #1 Groundwater | NY0301653 | 5 | 1 | |
| WILLISTON PARK (V) Groundwater | NY2902858 | 5 | 1 | |
| HARRIMAN VILLAGE Groundwater | NY3503531 | 5 | 1 | ⚠ High Risk |
| WAVERLY VILLAGE Groundwater | NY5304410 | 5 | 1 | |
| VOORHEESVILLE VILLAGE Groundwater | NY0100203 | 4 | 1 | |
| NEW YORK AMERICAN WATER - LYNBROOK Groundwater | NY2902835 | 4 | 1 | |
| CHESTER VILLAGE Surface Water | NY3503524 | 4 | 1 | |
| ARROW PARK INC. Groundwater | NY3503536 | 4 | 1 | |
| NEWBURGH CONSOLIDATED WD Surface Water | NY3503578 | 4 | 1 | |
| RIVERHEAD WD Groundwater | NY5103705 | 4 | 1 | |
| GLENS FALLS CITY Surface Water | NY5600104 | 4 | 1 | |
| YORKTOWN CONSOLD. WATER DIST.#1 Surface Water | NY5903469 | 4 | 1 | |
| GREENFIELD WATER DISTRICT Groundwater | NY1302794 | 3 | 1 | |
| MANCHESTER WATER DISTRICT, NY Groundwater | NY1330550 | 3 | 1 | |
| GARDEN CITY PARK WD Groundwater | NY2902825 | 3 | 1 | |
| WESTBURY WD Groundwater | NY2902856 | 3 | 1 | |
| SUEZ WATER WESTCHESTER, INC. RD2 Surface Water | NY5903456 | 3 | 1 | |
| NORTH POINT CREEK APARTMENTS LTD. Groundwater | NY1930059 | 2 | 1 | |
| WATERTOWN CITY Surface Water | NY2202346 | 2 | 1 | |
| GARDEN CITY (V) Groundwater | NY2902824 | 2 | 1 | |
| GLEN COVE CITY Groundwater | NY2902826 | 2 | 1 | |
| LOCUST VALLEY WD Groundwater | NY2902833 | 2 | 1 | |
| ROSLYN WD Groundwater | NY2902851 | 2 | 1 | |
| CORNING CITY Groundwater | NY5001209 | 2 | 1 | |
| FALLSBURG WHO-LS-SF Groundwater | NY5203324 | 2 | 1 | |
| BEDFORD CONSOLIDATED W.D. Surface Water | NY5903419 | 2 | 1 | |
| COLONIE VILLAGE Surface Water | NY0100194 | 1 | 1 | |
| HEMPSTEAD (V) Groundwater | NY2902827 | 1 | 1 | |
| GLENVILLE WD #11 Groundwater | NY4600091 | 1 | 1 | |
| MORNINGSIDE HEIGHTS WD / ERWIN (T) Groundwater | NY5001212 | 1 | 1 | |
| MONTICELLO VILLAGE Surface Water | NY5203337 | 1 | 1 | |
| OSSINING WATER DEPARTMENT Surface Water | NY5903451 | 1 | 1 | |
| FORT DRUM Groundwater | NY2212214 | 6 | 0 | |
| JERICHO WD Groundwater | NY2902831 | 5 | 0 | |
| JOHNSON CITY WATER WORKS Groundwater | NY0301668 | 4 | 0 | |
| VESTAL CONSOLIDATED W.D. #1 Groundwater | NY0301674 | 4 | 0 | |
| BETHPAGE WD Groundwater | NY2902817 | 4 | 0 | |
| UNITED WAPPINGER WATER IMPROVEMENT DIST. GU | NY1330660 | 3 | 0 | |
| OYSTER BAY WD Groundwater | NY2902844 | 3 | 0 | |
| NEW WINDSOR CONSOLIDATED WD Groundwater | NY3503580 | 3 | 0 | |
| PALM TREE Groundwater | NY3503627 | 3 | 0 | |
| GREENLAWN WD Groundwater | NY5103271 | 3 | 0 | |
| CORTLANDVILLE TOWN WATER Groundwater | NY1101755 | 2 | 0 | |
| BATAVIA CITY GU | NY1800544 | 2 | 0 | |
| LERAY TOWN WD 2 & 4 Groundwater | NY2221206 | 2 | 0 | |
| HILTON VILLAGE Surface Water | NY2701045 | 2 | 0 | |
| BALDWINSVILLE VILLAGE Groundwater | NY3304307 | 2 | 0 | |
| MONTGOMERY VILLAGE Groundwater | NY3503542 | 2 | 0 | |
| WOODBURY CONS. W.D. Groundwater | NY3503573 | 2 | 0 | |
| SARATOGA SPRINGS CITY, NY Surface Water | NY4500168 | 2 | 0 | |
| WATERFORD WATER WORKS (PURCHASE TROY) Surface Water | NY4500173 | 2 | 0 | |
| CLIFTON PARK WATER AUTHORITY Groundwater | NY4500175 | 2 | 0 | |
| MOUNT KISCO WATER DEPARTMENT Surface Water | NY5903437 | 2 | 0 | |
| BETHLEHEM WD NO 1 Groundwater | NY0100191 | 1 | 0 | |
| RAVENA VILLAGE Surface Water | NY0100201 | 1 | 0 | |
| FRIENDSHIP TOWN WATER DISTRICT Groundwater | NY0200319 | 1 | 0 | |
| WELLSVILLE VILLAGE PUBLIC WATER Surface Water | NY0200327 | 1 | 0 | |
| ALFRED STATE COLLEGE Groundwater | NY0220581 | 1 | 0 | |
| ENDICOTT MUNICIPAL WATER WORKS Groundwater | NY0301665 | 1 | 0 | |
| SALAMANCA CITY Groundwater | NY0400349 | 1 | 0 | |
| BIG FLATS WATER DISTRICT 5 Groundwater | NY0701011 | 1 | 0 | |
| NORWICH CITY Groundwater | NY0801745 | 1 | 0 | |
| PLATTSBURGH CITY Surface Water | NY0900217 | 1 | 0 | |
| GREENPORT WD NO1 Groundwater | NY1000238 | 1 | 0 | |
| WAPPINGERS FALLS VILLAGE Surface Water | NY1302783 | 1 | 0 | |
| ARLINGTON HIGH SCHOOL Groundwater | NY1319317 | 1 | 0 | |
| EAST AURORA VILLAGE Surface Water | NY1400433 | 1 | 0 | |
| SPRINGVILLE VILLAGE Groundwater | NY1400539 | 1 | 0 | |
| TICONDEROGA WD Surface Water | NY1500293 | 1 | 0 | |
| GLOVERSVILLE (C) WATER WORKS Surface Water | NY1700018 | 1 | 0 | |
| CATSKILL VILLAGE Surface Water | NY1900026 | 1 | 0 | |
| ILION (V) WATER WORKS GU | NY2102307 | 1 | 0 | |
| CAZENOVIA VILLAGE Groundwater | NY2602371 | 1 | 0 | |
| MORRISVILLE STATE COLLEGE Groundwater | NY2613319 | 1 | 0 | |
| MCWA Groundwater | NY2701047 | 1 | 0 | |
| TOWN OF HEMPSTEAD WATER DEPARTMENT Groundwater | NY2900000 | 1 | 0 | |
| HICKSVILLE WD Groundwater | NY2902829 | 1 | 0 | |
| LONG BEACH CITY Groundwater | NY2902834 | 1 | 0 | |
| NEW YORK AMERICAN WATER - MERRICK Groundwater | NY2902840 | 1 | 0 | |
| PLAINVIEW WD Groundwater | NY2902845 | 1 | 0 | |
| LEWISTON WATER IMPROVEMENTAREA Surface Water | NY3100561 | 1 | 0 | |
| NEWFANE WD NO1,2,3 CONSOL Surface Water | NY3100573 | 1 | 0 | |
| OCWA Surface Water | NY3304336 | 1 | 0 | |
| BRISTOL HARBOUR WATER CORP Surface Water | NY3400784 | 1 | 0 | |
| GENEVA CITY Surface Water | NY3401156 | 1 | 0 | |
| CORNWALL-ON-HUDSON Surface Water | NY3503526 | 1 | 0 | |
| GOSHEN VILLAGE Groundwater | NY3503528 | 1 | 0 | |
| PINE BUSH WATER DISTRICT Groundwater | NY3503553 | 1 | 0 | |
| WALDEN VILLAGE Groundwater | NY3503559 | 1 | 0 | |
| WASHINGTONVILLE VILLAGE Groundwater | NY3503567 | 1 | 0 | |
| MINISINK VALLEY SCHOOL DIST. WATER LOOP Groundwater | NY3522798 | 1 | 0 | |
| CLARENDON TOWN WDS Surface Water | NY3630023 | 1 | 0 | |
| CHERRY VALLEY SPRINGFIELD CS Groundwater | NY3830002 | 1 | 0 | |
| HOOSICK FALLS (V) PWS GU | NY4100041 | 1 | 0 | |
| CREEKSIDE VILLAGE MHP Groundwater | NY4710781 | 1 | 0 | |
| WATERLOO VILLAGE Surface Water | NY4901199 | 1 | 0 | |
| BATH VILLAGE CONSOLIDATED SAMPLING AREA Groundwater | NY5001206 | 1 | 0 | |
| DIX HILLS WATER DISTRICT Groundwater | NY5103276 | 1 | 0 | |
| HAMPTON BAYS WD Groundwater | NY5103704 | 1 | 0 | |
| BROOKHAVEN NATIONAL LABS Groundwater | NY5111891 | 1 | 0 | |
| LIBERTY VILLAGE Groundwater | NY5203329 | 1 | 0 | ◐ Low Level |
| WOODRIDGE VILLAGE Groundwater | NY5203348 | 1 | 0 | |
| HOEY-DE GRAW WATERWORKS INC Groundwater | NY5203353 | 1 | 0 | |
| TIOGA DOWNS Groundwater | NY5330037 | 1 | 0 | |
| ITHACA TOWN WD Surface Water | NY5404419 | 1 | 0 | |
| KINGSVALE WATER CO Groundwater | NY5503392 | 1 | 0 | |
| FORT EDWARD VILLAGE Surface Water | NY5700119 | 1 | 0 | |
| SODUS-HURON-WOLCOTT-BUTLER CSA MX | NY5801247 | 1 | 0 | |
| PENN YAN VILLAGE Surface Water | NY6101263 | 1 | 0 | |