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Instant water quality grades for 20,713 US ZIP codes. Powered by EPA data, PFAS monitoring, and violation records.

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20,713 ZIP Codes
30 PFAS Tested
3.2M Violations Tracked
50 States + DC

National Overview

Water Quality Grades

Each mapped ZIP receives an internal public-record indicator from A to F based on contaminant records, PFAS occurrence data, violation history, and enforcement actions. It is not an EPA safety grade.

A
53% 10,925
B
29% 6,022
C
15% 3,070
D
3% 674
F
0% 22

Browse by State

All 50 States + DC

A
Arkansas539 ZIPs · Score 97
 A
New Mexico293 ZIPs · Score 96
 A
Iowa835 ZIPs · Score 95
 A
Oklahoma627 ZIPs · Score 95
 A
South Dakota326 ZIPs · Score 94
 A
North Dakota339 ZIPs · Score 93
 A
California1709 ZIPs · Score 92
 A
Hawaii84 ZIPs · Score 92
 A
Nevada166 ZIPs · Score 92
 A
Washington501 ZIPs · Score 92
 A
North Carolina811 ZIPs · Score 91
 A
Montana242 ZIPs · Score 90
 A
Idaho235 ZIPs · Score 90
 A
Massachusetts547 ZIPs · Score 90
 A
Tennessee604 ZIPs · Score 90
 A
Kentucky680 ZIPs · Score 90
 A
Georgia736 ZIPs · Score 90
 A
Louisiana522 ZIPs · Score 89
 A
Missouri888 ZIPs · Score 89
 A
New Hampshire186 ZIPs · Score 89
 A
Vermont182 ZIPs · Score 88
 A
South Carolina400 ZIPs · Score 88
 A
Virginia634 ZIPs · Score 88
 A
Wyoming124 ZIPs · Score 88
 A
Michigan777 ZIPs · Score 88
 A
Kansas638 ZIPs · Score 88
 A
Connecticut266 ZIPs · Score 86
 A
New York1475 ZIPs · Score 86
 A
Indiana656 ZIPs · Score 86
 B
Utah265 ZIPs · Score 85
 B
Delaware62 ZIPs · Score 84
 B
Ohio1055 ZIPs · Score 82
 B
Rhode Island68 ZIPs · Score 82
 B
Oregon346 ZIPs · Score 82
 B
Maryland352 ZIPs · Score 80
 B
Nebraska517 ZIPs · Score 79
 B
West Virginia473 ZIPs · Score 79
 B
Texas1912 ZIPs · Score 79
 B
Alabama640 ZIPs · Score 78
 B
Maine215 ZIPs · Score 78
 B
Minnesota737 ZIPs · Score 75
 B
Alaska200 ZIPs · Score 73
 B
Wisconsin628 ZIPs · Score 72
 B
District of Columbia268 ZIPs · Score 72
 B
Arizona384 ZIPs · Score 72
 B
New Jersey556 ZIPs · Score 71
 C
Mississippi437 ZIPs · Score 69
 C
Colorado459 ZIPs · Score 68
 C
Florida1012 ZIPs · Score 67
 C
Pennsylvania1416 ZIPs · Score 64
 C
Illinois1259 ZIPs · Score 64

Featured local reports

Explore recently viewed ZIP reports

Start with these local reports, then enter your own ZIP code above to review the public water-system data available for your area.

A
New York, NY water quality ZIP 10003 · Score 87 · 8,271,000 served
A
New York, NY water quality ZIP 10115 · Score 87 · 8,271,000 served
D
Greenville, NH water quality ZIP 03048 · Score 43 · 472 served
D
Havertown, PA water quality ZIP 19083 · Score 44 · 822,600 served
B
Lunenburg, MA water quality ZIP 01462 · Score 77 · 49,165 served
A
Magnolia, MN water quality ZIP 56158 · Score 95 · 214 served
A
Rescue, CA water quality ZIP 95672 · Score 97 · 132,171 served
C
Hamden, NY water quality ZIP 13782 · Score 68 · 311 served
B
Lincolnton, NC water quality ZIP 28092 · Score 78 · 65,532 served
B
Box Springs, GA water quality ZIP 31801 · Score 75 · 9,903 served
B
Donovan, IL water quality ZIP 60931 · Score 78 · 279 served
C
East Northport, NY water quality ZIP 11731 · Score 67 · 1,142,000 served
C
Bath, NH water quality ZIP 03740 · Score 68 · 100 served
A
Hollis Center, ME water quality ZIP 04042 · Score 85 · 30 served
C
Monroe, NY water quality ZIP 10950 · Score 61 · 67,154 served
A
Medinah, IL water quality ZIP 60157 · Score 97 · 9,506 served
A
Ozone Park, NY water quality ZIP 11416 · Score 87 · 8,271,000 served
B
Washingtonville, NY water quality ZIP 10992 · Score 74 · 7,700 served
B
Delanson, NY water quality ZIP 12053 · Score 72 · 530 served
A
Oyster Bay, NY water quality ZIP 11771 · Score 86 · 8,700 served
C
Greenport, NY water quality ZIP 11944 · Score 67 · 1,100,000 served
D
Oceanside, NY water quality ZIP 11572 · Score 38 · 220,000 served
A
Bonnerdale, AR water quality ZIP 71933 · Score 93 · 88,061 served
A
Mayflower, AR water quality ZIP 72106 · Score 99 · 451,001 served
A
Waddy, KY water quality ZIP 40076 · Score 92 · 7,892 served
D
Malverne, NY water quality ZIP 11565 · Score 38 · 220,000 served
A
Tyngsboro, MA water quality ZIP 01879 · Score 88 · 38,148 served
C
Bohemia, NY water quality ZIP 11716 · Score 67 · 1,100,000 served
B
Duanesburg, NY water quality ZIP 12056 · Score 78 · 95 served
C
Ardsley On Hudson, NY water quality ZIP 10503 · Score 69 · 146,732 served
C
Germantown, NY water quality ZIP 12526 · Score 64 · 35 served
C
Greenville, NY water quality ZIP 12083 · Score 69 · 1,130 served
C
Port Jefferson Station, NY water quality ZIP 11776 · Score 67 · 1,100,000 served
C
East Setauket, NY water quality ZIP 11733 · Score 67 · 1,100,000 served
A
Glen Cove, NY water quality ZIP 11542 · Score 89 · 41,400 served
B
Sandy Hook, CT water quality ZIP 06482 · Score 82 · 6,054 served
C
Mattituck, NY water quality ZIP 11952 · Score 67 · 1,100,000 served
B
Waterbury, CT water quality ZIP 06704 · Score 83 · 130,006 served
A
Cuttingsville, VT water quality ZIP 05738 · Score 88 · 178 served
A
Boston, MA water quality ZIP 02115 · Score 92 · 675,647 served
C
Coram, NY water quality ZIP 11727 · Score 67 · 1,100,000 served
B
Sandown, NH water quality ZIP 03873 · Score 78 · 173 served
A
Brooklyn, NY water quality ZIP 11219 · Score 87 · 8,271,000 served
C
Humarock, MA water quality ZIP 02047 · Score 64 · 34,000 served
B
Cambridge, MA water quality ZIP 02139 · Score 78 · 118,214 served
B
Centerville, MA water quality ZIP 02634 · Score 72 · 50,000 served
C
Franklin, ME water quality ZIP 04634 · Score 64 · 443 served
B
Van Buren, ME water quality ZIP 04785 · Score 79 · 2,190 served
A
Chester, CT water quality ZIP 06412 · Score 100 · 5,030 served
B
Lambertville, NJ water quality ZIP 08530 · Score 83 · 3,960 served
C
Trenton, NJ water quality ZIP 08640 · Score 67 · 12,765 served
A
Elmhurst, NY water quality ZIP 11373 · Score 87 · 8,271,000 served
C
Orient, NY water quality ZIP 11957 · Score 67 · 1,100,000 served
C
Eastport, NY water quality ZIP 11941 · Score 67 · 1,100,000 served
B
Mohegan Lake, NY water quality ZIP 10547 · Score 78 · 36,000 served
B
Cape May Point, NJ water quality ZIP 08212 · Score 80 · 4,000 served
A
New York, NY water quality ZIP 10211 · Score 87 · 8,271,000 served
A
Wallkill, NY water quality ZIP 12589 · Score 90 · 1,200 served
A
New Paris, PA water quality ZIP 15554 · Score 88 · 801 served
C
Blue Hill, ME water quality ZIP 04614 · Score 69 · 120 served
B
Kingston, MA water quality ZIP 02364 · Score 72 · 14,712 served
C
New Fairfield, CT water quality ZIP 06812 · Score 63 · 880 served
A
Johnstown, NY water quality ZIP 12095 · Score 97 · 8,154 served
C
Hogansburg, NY water quality ZIP 13655 · Score 65 · 5,500 served
B
Honeoye Falls, NY water quality ZIP 14472 · Score 81 · 768,458 served
A
Tonawanda, NY water quality ZIP 14150 · Score 93 · 385,951 served
C
Nesconset, NY water quality ZIP 11767 · Score 67 · 1,100,000 served
C
Ronkonkoma, NY water quality ZIP 11779 · Score 67 · 1,100,000 served
C
Water Mill, NY water quality ZIP 11976 · Score 67 · 1,100,000 served
C
Selden, NY water quality ZIP 11784 · Score 67 · 1,100,000 served
A
Hawk Run, PA water quality ZIP 16840 · Score 100 · 20,784 served
B
Vernon, NJ water quality ZIP 07462 · Score 74 · 5,517 served
B
Anson, ME water quality ZIP 04911 · Score 72 · 5,568 served
A
Piney Point, MD water quality ZIP 20674 · Score 87 · 672 served
A
Westbrook, CT water quality ZIP 06498 · Score 87 · 33,975 served
A
New York, NY water quality ZIP 10001 · Score 87 · 8,271,000 served
D
Bridgeton, NJ water quality ZIP 08302 · Score 46 · 22,770 served
C
Rocky Point, NY water quality ZIP 11778 · Score 67 · 1,100,000 served
B
Greenlawn, NY water quality ZIP 11740 · Score 82 · 123,760 served
B
North Creek, NY water quality ZIP 12853 · Score 83 · 1,100 served
B
Rochester, NY water quality ZIP 14692 · Score 81 · 768,458 served
A
Falls Church, VA water quality ZIP 22046 · Score 85 · 1,121,613 served
A
New York, NY water quality ZIP 10121 · Score 87 · 8,271,000 served
C
Trenton, NJ water quality ZIP 08628 · Score 56 · 250,171 served
B
Morton, NY water quality ZIP 14508 · Score 81 · 768,458 served
C
Lyburn, WV water quality ZIP 25632 · Score 61 · 3,611 served
A
Arlington, VT water quality ZIP 05250 · Score 97 · 1,250 served
C
Hauppauge, NY water quality ZIP 11788 · Score 67 · 1,100,000 served
A
South Otselic, NY water quality ZIP 13155 · Score 99 · 300 served
D
Feasterville Trevose, PA water quality ZIP 19053 · Score 48 · 1,035,217 served
A
Elloree, SC water quality ZIP 29047 · Score 95 · 1,498 served
B
Monponsett, MA water quality ZIP 02350 · Score 75 · 9,546 served
A
Chestnut Hill, MA water quality ZIP 02467 · Score 88 · 88,415 served
A
Littleton, NH water quality ZIP 03561 · Score 89 · 6,500 served
A
Canton, CT water quality ZIP 06019 · Score 87 · 6,324 served
A
East Hartford, CT water quality ZIP 06108 · Score 96 · 390,887 served

About This Data

US Water Score aggregates publicly available water quality data from the EPA's Safe Drinking Water Information System (SDWIS), the Unregulated Contaminant Monitoring Rule (UCMR5) for PFAS, and enforcement records. The current build uses a 2026-07-21 SDWIS snapshot and August 2026 UCMR5 files.

Our Methodology

Model 1.2.0: each active community water system starts at 100 and may receive four documented penalty groups: five-year violation count and severity (up to 45 points), the latest EPA ECHO lead and copper 90th-percentile result selected by sampling-period dates (up to 25 points), UCMR5 PFAS occurrence values compared with EPA numerical MCL values (up to 20 points), and five-year enforcement actions (up to 10 points). System scores are weighted by reported population for ZIP indicators. Read the complete formula and limitations. Letter grades are internal screening indicators, not EPA ratings or regulatory compliance determinations.

Disclaimer

This site provides water quality information for educational purposes only. Data may not reflect current conditions. Always contact your local water utility or review your annual Consumer Confidence Report for the most up-to-date information. This is not medical or legal advice.