Systems with a yearly average at or above an EPA-based study benchmark
26.9%67 of 249 active community water systems
All 249 systems had enough required samples to calculate a yearly average. 67 had at least one yearly average at or above a study benchmark; 182 did not.
EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.
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Find your water system
ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.
Compound summary
System counts in Massachusetts
Each count shows how many included water systems had a yearly average at or above the named study benchmark.
| Study benchmark | Systems at or above benchmark | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 61 | 249 | 24.5% |
| PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 39 | 249 | 15.7% |
| PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 2 | 249 | 0.8% |
| PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 249 | 0.0% |
| HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 249 | 0.0% |
| Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1) | 2 | 249 | 0.8% |
System directory
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | Study benchmark result |
|---|---|---|---|---|---|
| ABINGTON/ROCKLAND JOINT WTR. WORKS | MA4001000 | 33,387 | Surface water | 3 | At or above a study benchmark |
| ACTON WATER SUPPLY DISTRICT | MA2002000 | 21,285 | Groundwater under influence of surface water | 3 | At or above a study benchmark |
| ACUSHNET WATER DEPARTMENT | MA4003000 | 8,430 | Surface water purchased | 1 | Below all study benchmarks |
| ADAMS FIRE DISTRICT | MA1004000 | 7,945 | Ground water | 1 | Below all study benchmarks |
| AGAWAM WATER DEPARTMENT | MA1005000 | 28,692 | Surface water purchased | 1 | Below all study benchmarks |
| AMHERST DPW WATER DIVISION | MA1008000 | 39,263 | Surface water | 5 | Below all study benchmarks |
| ANDOVER WATER DEPT | MA3009000 | 36,569 | Surface water | 1 | Below all study benchmarks |
| AQUARION WATER COMPANY OXFORD | MA2226000 | 7,384 | Ground water | 3 | Below all study benchmarks |
| AQUARION WATER COMPANY, MILLBURY | MA2186000 | 11,368 | Surface water purchased | 3 | At or above a study benchmark |
| ARLINGTON WATER DEPT. (MWRA) | MA3010000 | 46,308 | Surface water purchased | 1 | Below all study benchmarks |
| ASH/WIN JOINT WATER AUTHORITY | MA2011004 | 11,394 | Surface water | 1 | Below all study benchmarks |
| ASHBURNHAM WATER DEPARTMENT | MA2011000 | 3,680 | Surface water purchased | 1 | Below all study benchmarks |
| ATHOL DPW WATER DIVISION | MA1015000 | 10,587 | Ground water | 2 | Below all study benchmarks |
| ATTLEBORO WATER DEPT | MA4016000 | 46,461 | Surface water | 2 | Below all study benchmarks |
| AUBURN WATER DISTRICT, MA | MA2017000 | 12,255 | Surface water purchased | 6 | At or above a study benchmark |
| AYER DPW WATER DIVISION | MA2019000 | 8,479 | Ground water | 2 | Below all study benchmarks |
| Ashland Water & Sewer Dept. | MA3014000 | 18,832 | Ground water | 1 | Below all study benchmarks |
| BARNSTABLE FIRE DISTRICT | MA4020000 | 5,400 | Ground water | 3 | At or above a study benchmark |
| BARRE WATER DEPARTMENT | MA2021000 | 2,610 | Ground water | 3 | Below all study benchmarks |
| BEDFORD WATER DEPT. | MA3023000 | 14,955 | Surface water purchased | 1 | Below all study benchmarks |
| BELCHERTOWN WATER DISTRICT | MA1024000 | 3,253 | Ground water | 2 | Below all study benchmarks |
| BELLINGHAM DPW WATER SEWER DIV. | MA2025000 | 16,556 | Ground water | 2 | Below all study benchmarks |
| BELMONT WATER DEPT. (MWRA) | MA3026000 | 27,442 | Surface water purchased | 1 | Below all study benchmarks |
| BEVERLY WATER DEPT | MA3030000 | 47,461 | Surface water purchased | 1 | Below all study benchmarks |
| BILLERICA WATER WORKS | MA3031000 | 42,119 | Surface water | 1 | Below all study benchmarks |
| BLACKSTONE WATER DEPARTMENT | MA2032000 | 9,463 | Ground water | 1 | Below all study benchmarks |
| BOSTON WATER AND SEWER COMMISSION (MWRA) | MA3035000 | 675,647 | Surface water purchased | 1 | Below all study benchmarks |
| BOURNE WATER DISTRICT | MA4036000 | 22,500 | Ground water | 7 | Below all study benchmarks |
| BRAINTREE WATER AND SEWER DEPT. | MA4040000 | 39,143 | Surface water | 1 | At or above a study benchmark |
| BREWSTER WATER DEPARTMENT | MA4041000 | 35,000 | Ground water | 5 | Below all study benchmarks |
| BRIDGEWATER WATER DEPARTMENT | MA4042000 | 28,633 | Ground water | 3 | At or above a study benchmark |
| BROCKTON WATER DEPARTMENT | MA4044000 | 105,788 | Surface water | 1 | Below all study benchmarks |
| BROOKLINE WATER AND SEWER DIVISION | MA3046000 | 63,191 | Surface water purchased | 1 | Below all study benchmarks |
| BURLINGTON WATER DEPT | MA3048000 | 25,864 | Surface water | 2 | Below all study benchmarks |
| BUZZARDS BAY WATER DISTRICT | MA4036001 | 7,700 | Ground water | 5 | Below all study benchmarks |
| CAMBRIDGE WATER DEPARTMENT | MA3049000 | 118,214 | Surface water | 1 | Below all study benchmarks |
| CANTON WATER DEPT | MA4050000 | 22,766 | Surface water purchased | 3 | At or above a study benchmark |
| CENTERVILLE OSTERVILLE MARSTONS MILLS WD | MA4020002 | 50,000 | Ground water | 15 | At or above a study benchmark |
| CHATHAM WATER DEPARTMENT | MA4055000 | 30,000 | Ground water | 5 | Below all study benchmarks |
| CHELMSFORD WATER DISTRICT | MA3056000 | 28,750 | Ground water | 4 | At or above a study benchmark |
| CHELSEA WATER DEPT. (MWRA) | MA3057000 | 40,787 | Surface water purchased | 1 | Below all study benchmarks |
| CHERRY VALLEY/ ROCHDALE WATER DISTRICT | MA2151001 | 3,696 | Surface water purchased | 2 | Below all study benchmarks |
| CHICOPEE WATER DEPT (MWRA) | MA1061000 | 55,560 | Surface water purchased | 1 | Below all study benchmarks |
| CITY OF NEW BEDFORD DPI | MA4201000 | 101,079 | Surface water | 1 | Below all study benchmarks |
| CLINTON WATER DEPT | MA2064000 | 15,428 | Surface water | 1 | Below all study benchmarks |
| CONCORD WATER DEPT, MA | MA3067000 | 18,788 | Surface water | 6 | At or above a study benchmark |
| COTUIT FIRE DISTRICT WATER DEPARTMENT | MA4020003 | 4,938 | Ground water | 5 | Below all study benchmarks |
| DANVERS WATER DEPT. | MA3071000 | 28,087 | Surface water | 2 | Below all study benchmarks |
| DARTMOUTH WATER DIVISION | MA4072000 | 24,696 | Surface water purchased | 4 | At or above a study benchmark |
| DEDHAM WESTWOOD WATER DIST. | MA3073000 | 41,630 | Surface water purchased | 3 | At or above a study benchmark |
| DENNIS WATER DISTRICT | MA4075000 | 65,000 | Ground water | 9 | Below all study benchmarks |
| DEVENS MASSDEVELOPMENT | MA2019001 | 6,500 | Ground water | 3 | Below all study benchmarks |
| DIGHTON WATER DISTRICT | MA4076000 | 5,280 | Surface water purchased | 1 | Below all study benchmarks |
| DRACUT WATER SUPPLY DISTRICT | MA3079000 | 25,808 | Surface water purchased | 3 | At or above a study benchmark |
| DUDLEY WATER DEPARTMENT | MA2080000 | 5,515 | Ground water | 1 | Below all study benchmarks |
| DUXBURY WATER DEPARTMENT | MA4082000 | 16,387 | Ground water | 8 | At or above a study benchmark |
| EAST LONGMEADOW DPW WATER DEPT | MA1085000 | 16,358 | Surface water purchased | 1 | Below all study benchmarks |
| EASTHAMPTON WATER DEPT | MA1087000 | 16,211 | Ground water | 4 | Below all study benchmarks |
| EASTON WATER DIV | MA4088000 | 25,058 | Ground water | 4 | At or above a study benchmark |
| EDGARTOWN WATER DEPARTMENT | MA4089000 | 8,027 | Ground water | 5 | Below all study benchmarks |
| EVERETT WATER DEPT. (MWRA) | MA3093000 | 49,075 | Surface water purchased | 1 | Below all study benchmarks |
| East Bridgewater Water Dept. | MA4083000 | 14,526 | Ground water | 2 | At or above a study benchmark |
| FALL RIVER WATER DEPARTMENT | MA4095000 | 94,000 | Surface water | 1 | Below all study benchmarks |
| FALMOUTH WATER DEPT | MA4096000 | 97,551 | Surface water | 4 | Below all study benchmarks |
| FITCHBURG DPW, DIV. OF WATER SUPPLY | MA2097000 | 41,946 | Surface water | 2 | Below all study benchmarks |
| FOXBORO WATER DEPARTMENT | MA4099000 | 18,721 | Ground water | 3 | At or above a study benchmark |
| FRAMINGHAM WATER DEPT. (MWRA) | MA3100000 | 72,362 | Surface water purchased | 1 | Below all study benchmarks |
| FRANKLIN WATER DEPARTMENT, MA | MA2101000 | 33,706 | Ground water | 7 | At or above a study benchmark |
| GARDNER WATER DEPARTMENT | MA2103000 | 21,381 | Surface water | 2 | Below all study benchmarks |
| GEORGETOWN WATER DEPARTMENT | MA3105000 | 8,766 | Ground water | 1 | Below all study benchmarks |
| GLOUCESTER PUBLIC UTILITY DIVISION | MA3107000 | 37,440 | Surface water | 2 | Below all study benchmarks |
| GRAFTON WATER DISTRICT | MA2110000 | 10,925 | Ground water | 4 | At or above a study benchmark |
| GREAT BARRINGTON FIRE DIST | MA1113000 | 4,380 | Ground water | 1 | Below all study benchmarks |
| GREENFIELD WATER DEPARTMENT | MA1114000 | 17,768 | Surface water | 2 | Below all study benchmarks |
| GROTON WATER DEPARTMENT | MA2115000 | 5,456 | Ground water | 2 | Below all study benchmarks |
| GROVELAND WATER DEPARTMENT | MA3116000 | 6,508 | Ground water | 2 | At or above a study benchmark |
| HADLEY DPW WATER DIVISION | MA1117002 | 4,819 | Ground water | 2 | Below all study benchmarks |
| HALIFAX WATER DEPARTMENT | MA4118000 | 7,575 | Surface water purchased | 4 | Below all study benchmarks |
| HAMILTON WATER DEPT | MA3119000 | 7,674 | Ground water | 2 | At or above a study benchmark |
| HANOVER WATER DEPT, MA | MA4122000 | 14,984 | Groundwater under influence of surface water | 3 | At or above a study benchmark |
| HANSCOM AFB | MA3023002 | 11,789 | Surface water purchased | 2 | Below all study benchmarks |
| HANSON WATER DEPARTMENT | MA4123000 | 9,612 | Surface water purchased | 1 | At or above a study benchmark |
| HARWICH WATER DEPARTMENT | MA4126000 | 39,144 | Ground water | 5 | Below all study benchmarks |
| HATFIELD WATER DEPT | MA1127000 | 3,164 | Surface water | 3 | Below all study benchmarks |
| HAVERHILL WATER DEPT | MA3128000 | 61,277 | Surface water | 1 | Below all study benchmarks |
| HAYSTACK ESTATES | MA3330019 | 60 | Ground water | 1 | At or above a study benchmark |
| HOLBROOK PUBLIC WORKS DEPT | MA4133000 | 11,405 | Surface water purchased | 1 | At or above a study benchmark |
| HOLDEN WATER DIVISION, DPW | MA2134000 | 18,016 | Surface water purchased | 4 | At or above a study benchmark |
| HOLLISTON WATER DEPARTMENT | MA2136000 | 15,139 | Ground water | 3 | At or above a study benchmark |
| HOLYOKE WATER WORKS | MA1137000 | 37,838 | Surface water | 2 | Below all study benchmarks |
| HOPEDALE WATER DEPARTMENT | MA2138000 | 6,017 | Surface water purchased | 1 | At or above a study benchmark |
| HOPKINTON WATER DEPARTMENT | MA2139000 | 12,680 | Ground water | 4 | At or above a study benchmark |
| HUDSON WATER SUPPLY | MA2141000 | 20,032 | Surface water | 2 | Below all study benchmarks |
| HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE | MA4020004 | 35,000 | Ground water | 3 | Below all study benchmarks |
| INIMA USA / AQUARIA LLC | MA4076004 | 105,643 | Surface water | 1 | Below all study benchmarks |
| IPSWICH DPU WATER DEPT | MA3144000 | 13,138 | Surface water | 5 | At or above a study benchmark |
| KENWOOD WATER DISTRICT | MA3079001 | 9,620 | Surface water purchased | 2 | Below all study benchmarks |
| LANCASTER WATER DEPARTMENT | MA2147000 | 6,000 | Ground water | 2 | Below all study benchmarks |
| LAWRENCE WATER WORKS | MA3149000 | 89,143 | Surface water | 1 | Below all study benchmarks |
| LEE WATER DEPT | MA1150000 | 5,686 | Surface water | 1 | Below all study benchmarks |
| LENOX DPW WATER DIVISION | MA1152000 | 9,800 | Surface water | 1 | Below all study benchmarks |
| LEOMINSTER WATER DIVISION | MA2153000 | 41,683 | Surface water | 4 | Below all study benchmarks |
| LEXINGTON WATER DEPT. (MWRA) | MA3155000 | 34,074 | Surface water purchased | 1 | Below all study benchmarks |
| LINCOLN WATER DEPT | MA3157000 | 5,593 | Surface water | 2 | At or above a study benchmark |
| LITTLETON WATER DEPARTMENT | MA2158000 | 9,307 | Ground water | 1 | Below all study benchmarks |
| LONGMEADOW WATER DEPT | MA1159000 | 15,853 | Surface water purchased | 1 | Below all study benchmarks |
| LOWELL REGIONAL WATER UTILITY | MA3160000 | 120,418 | Surface water | 1 | Below all study benchmarks |
| LUNENBURG WATER DISTRICT | MA2162000 | 7,219 | Ground water | 2 | Below all study benchmarks |
| LYNN WATER AND SEWER COMM | MA3163000 | 101,253 | Surface water | 1 | Below all study benchmarks |
| LYNNFIELD CENTER WATER DISTRICT | MA3164000 | 8,525 | Surface water purchased | 3 | At or above a study benchmark |
| MALDEN WATER DIVISION (MWRA) | MA3165000 | 66,263 | Surface water purchased | 1 | Below all study benchmarks |
| MANCHESTER BY THE SEA DPW | MA3166000 | 5,201 | Surface water | 2 | At or above a study benchmark |
| MANSFIELD WATER DIVISION | MA4167000 | 21,797 | Ground water | 3 | Below all study benchmarks |
| MARBLEHEAD WATER DEPT. (MWRA) | MA3168000 | 20,441 | Surface water purchased | 1 | Below all study benchmarks |
| MARION WATER DIVISION | MA4169000 | 6,119 | Ground water | 1 | Below all study benchmarks |
| MARLBOROUGH DPW WATER DIV. (MWRA) | MA2170000 | 41,799 | Surface water purchased | 1 | Below all study benchmarks |
| MARSHFIELD WATER DEPARTMENT | MA4171000 | 34,000 | Ground water | 16 | At or above a study benchmark |
| MASHPEE WATER DISTRICT | MA4172039 | 36,922 | Ground water | 6 | Below all study benchmarks |
| MATTAPOISETT RIVER VALLEY W.D. | MA4173001 | 29,600 | Ground water purchased | 2 | Below all study benchmarks |
| MATTAPOISETT WATER DEPARTMENT | MA4173000 | 7,685 | Ground water | 1 | Below all study benchmarks |
| MAYNARD DPW, WATER DIVISION | MA2174000 | 10,616 | Ground water | 3 | At or above a study benchmark |
| MCI NORFOLK/CEDAR JUNCTION/WALPOLE | MA2208001 | 2,200 | Ground water | 1 | Below all study benchmarks |
| MCI SHIRLEY | MA2270001 | 3,500 | Ground water | 1 | Below all study benchmarks |
| MEDFIELD WATER DEPT. | MA2175000 | 12,713 | Ground water | 3 | At or above a study benchmark |
| MEDFORD WATER DEPT. (MWRA) | MA3176000 | 61,700 | Surface water purchased | 1 | Below all study benchmarks |
| MEDWAY WATER DEPARTMENT | MA2177000 | 14,176 | Ground water | 2 | At or above a study benchmark |
| MELROSE WATER DIVISION (MWRA) | MA3178000 | 29,938 | Surface water purchased | 1 | Below all study benchmarks |
| MERRIMAC WATER DEPARTMENT | MA3180000 | 6,988 | Ground water | 2 | At or above a study benchmark |
| METHUEN WATER DEPT | MA3181000 | 53,059 | Surface water | 1 | Below all study benchmarks |
| MIDDLEBOROUGH WATER SUPPLY | MA4182000 | 15,350 | Ground water | 10 | At or above a study benchmark |
| MIDDLETON WATER DEPT. | MA3184000 | 7,291 | Surface water purchased | 1 | Below all study benchmarks |
| MILFORD WATER COMPANY | MA2185000 | 30,379 | Surface water | 2 | At or above a study benchmark |
| MILLIS WATER DEPT | MA2187000 | 9,055 | Ground water | 4 | At or above a study benchmark |
| MILTON WATER DEPT. (MWRA) | MA3189000 | 28,630 | Surface water purchased | 1 | Below all study benchmarks |
| MONSON WATER AND SEWER DEPT | MA1191000 | 4,222 | Ground water | 3 | Below all study benchmarks |
| NAHANT WATER DEPT. (MWRA) | MA3196000 | 3,334 | Surface water purchased | 1 | Below all study benchmarks |
| NATICK WATER DEPARTMENT | MA3198000 | 37,006 | Ground water | 4 | At or above a study benchmark |
| NEEDHAM WATER DEPT | MA3199000 | 31,664 | Surface water purchased | 2 | At or above a study benchmark |
| NEWBURYPORT WATER DEPARTMENT | MA3206000 | 20,335 | Surface water | 2 | Below all study benchmarks |
| NEWTON WATER DEPT. (MWRA) | MA3207000 | 88,931 | Surface water purchased | 1 | Below all study benchmarks |
| NORFOLK WATER DIVISION | MA2208000 | 7,602 | Ground water | 4 | At or above a study benchmark |
| NORTH ADAMS WATER DEPT | MA1209000 | 13,000 | Surface water | 1 | Below all study benchmarks |
| NORTH ANDOVER WATER DEPT | MA3210000 | 30,915 | Surface water | 1 | Below all study benchmarks |
| NORTH ATTLEBORO WATER DEPT | MA4211000 | 31,410 | Ground water | 4 | At or above a study benchmark |
| NORTH BROOKFIELD WATER DEPARTMENT | MA2212000 | 3,863 | Surface water | 1 | Below all study benchmarks |
| NORTH CHELMSFORD WATER DIST | MA3056002 | 7,660 | Ground water | 1 | Below all study benchmarks |
| NORTH RAYNHAM WATER DISTRICT | MA4245002 | 3,902 | Ground water | 2 | Below all study benchmarks |
| NORTH READING WATER DEPT. | MA3213000 | 16,379 | Surface water purchased | 1 | Below all study benchmarks |
| NORTH SAGAMORE WATER DISTRICT | MA4036002 | 4,668 | Ground water | 2 | Below all study benchmarks |
| NORTHAMPTON WATER DEPT | MA1214000 | 29,571 | Surface water | 3 | Below all study benchmarks |
| NORTHBOROUGH WATER DEPARTMENT (MWRA) | MA2215000 | 13,551 | Surface water purchased | 1 | Below all study benchmarks |
| NORTHBRIDGE WATER DIVISION | MA2216006 | 8,127 | Purchased ground water under influence of surface water source | 1 | Below all study benchmarks |
| NORTON WATER DEPARTMENT | MA4218000 | 19,161 | Ground water | 3 | At or above a study benchmark |
| NORWELL WATER DEPARTMENT | MA4219000 | 11,495 | Ground water | 3 | At or above a study benchmark |
| NORWOOD WATER DEPT. (MWRA) | MA4220000 | 29,909 | Surface water purchased | 1 | Below all study benchmarks |
| OAK BLUFFS WATER DISTRICT | MA4221000 | 24,000 | Ground water | 5 | Below all study benchmarks |
| ORANGE WATER DEPT | MA1223000 | 6,526 | Surface water purchased | 4 | Below all study benchmarks |
| ORLEANS WATER DEPARTMENT | MA4224000 | 17,460 | Ground water | 2 | Below all study benchmarks |
| OTIS AIR NATIONAL GUARD BASE | MA4096001 | 6,000 | Ground water | 1 | Below all study benchmarks |
| PALMER WATER DISTRICT NO.1 | MA1227000 | 4,789 | Surface water | 3 | Below all study benchmarks |
| PAXTON WATER DEPARTMENT | MA2228000 | 4,300 | Surface water purchased | 1 | Below all study benchmarks |
| PEABODY WATER DEPT. | MA3229000 | 54,481 | Surface water | 3 | At or above a study benchmark |
| PEMBROKE WATER DIVISION DPW | MA4231000 | 18,175 | Ground water | 3 | Below all study benchmarks |
| PEPPERELL DPW WATER DIVISION | MA2232000 | 9,217 | Ground water | 3 | At or above a study benchmark |
| PINEHILLS WATER COMPANY, INC. | MA4239055 | 9,478 | Ground water | 1 | Below all study benchmarks |
| PITTSFIELD DPU WATER DEPT | MA1236000 | 43,927 | Surface water | 2 | Below all study benchmarks |
| PLAINVILLE WATER DEPARTMENT | MA4238000 | 8,805 | Groundwater under influence of surface water | 2 | At or above a study benchmark |
| PLYMOUTH WATER DEPARTMENT, MA | MA4239000 | 47,100 | Ground water | 11 | Below all study benchmarks |
| PROVINCETOWN WATER DEPARTMENT | MA4242000 | 22,250 | Ground water | 2 | Below all study benchmarks |
| QUINCY WATER DEPT. (MWRA) | MA3243000 | 106,000 | Surface water purchased | 1 | Below all study benchmarks |
| RANDOLPH WATER DEPARTMENT | MA4244000 | 35,114 | Surface water purchased | 1 | At or above a study benchmark |
| RAYNHAM CENTER WATER DISTRICT | MA4245000 | 10,964 | Ground water | 3 | At or above a study benchmark |
| READING WATER DEPARTMENT | MA3246000 | 26,262 | Surface water purchased | 1 | Below all study benchmarks |
| REVERE WATER DIVISION (MWRA) | MA3248000 | 62,186 | Surface water purchased | 1 | Below all study benchmarks |
| ROCKPORT WATER DEPT | MA3252000 | 10,000 | Surface water | 1 | Below all study benchmarks |
| ROWLEY WATER DEPARTMENT | MA3254000 | 6,161 | Ground water | 2 | At or above a study benchmark |
| RUTLAND WATER DEPARTMENT | MA2257000 | 6,025 | Surface water | 2 | Below all study benchmarks |
| SALEM WATER DEPARTMENT, MA | MA3258000 | 44,480 | Surface water purchased | 1 | Below all study benchmarks |
| SANDWICH WATER DISTRICT | MA4261000 | 23,000 | Ground water | 10 | Below all study benchmarks |
| SAUGUS WATER DEPT. (MWRA) | MA3262000 | 27,844 | Surface water purchased | 1 | Below all study benchmarks |
| SCITUATE WATER DIVISION | MA4264000 | 19,297 | Surface water | 4 | At or above a study benchmark |
| SEEKONK WATER DISTRICT | MA4265000 | 13,801 | Ground water | 1 | At or above a study benchmark |
| SHARON WATER DEPT | MA4266000 | 16,846 | Ground water | 6 | At or above a study benchmark |
| SHIRLEY WATER DISTRICT | MA2270000 | 4,165 | Ground water | 3 | Below all study benchmarks |
| SHREWSBURY WATER DEPARTMENT | MA2271000 | 38,325 | Ground water | 1 | Below all study benchmarks |
| SOMERSET WATER DEPARTMENT | MA4273000 | 18,303 | Surface water | 1 | Below all study benchmarks |
| SOMERVILLE WATER DEPT. (MWRA) | MA3274000 | 81,045 | Surface water purchased | 1 | Below all study benchmarks |
| SOUTH DEERFIELD WATER SUPPLY DISTRICT | MA1074001 | 3,800 | Surface water | 1 | Below all study benchmarks |
| SOUTH HADLEY FD #1 (MWRA) | MA1275000 | 14,800 | Surface water purchased | 1 | Below all study benchmarks |
| SOUTH HADLEY FIRE DISTRICT #2 WATER DEPT | MA1275001 | 6,200 | Ground water | 2 | Below all study benchmarks |
| SOUTHAMPTON WATER DEPT | MA1276000 | 4,853 | Purchased ground water under influence of surface water source | 2 | Below all study benchmarks |
| SOUTHBOROUGH DPW WATER DIVISION (MWRA) | MA2277000 | 10,638 | Surface water purchased | 1 | Below all study benchmarks |
| SOUTHBRIDGE WATER DEPARTMENT | MA2278000 | 19,562 | Surface water | 1 | Below all study benchmarks |
| SOUTHWICK WATER DEPT | MA1279000 | 7,669 | Surface water purchased | 2 | Below all study benchmarks |
| SPENCER WATER DEPARTMENT | MA2280000 | 7,037 | Ground water | 2 | Below all study benchmarks |
| SPRINGFIELD WATER AND SEWER COMMISSION | MA1281000 | 169,170 | Surface water | 1 | Below all study benchmarks |
| STERLING WATER DEPARTMENT | MA2282000 | 6,715 | Ground water | 2 | Below all study benchmarks |
| STONEHAM WATER DEPT (MWRA SUPPLY) | MA3284000 | 23,244 | Surface water purchased | 1 | Below all study benchmarks |
| STURBRIDGE WATER DEPARTMENT | MA2287000 | 4,746 | Groundwater under influence of surface water | 2 | Below all study benchmarks |
| SUDBURY WATER DISTRICT | MA3288000 | 18,416 | Ground water | 5 | At or above a study benchmark |
| SWAMPSCOTT WATER DEPT. (MWRA) | MA3291000 | 15,300 | Surface water purchased | 1 | Below all study benchmarks |
| SWANSEA WATER DISTRICT | MA4292000 | 17,375 | Surface water | 4 | Below all study benchmarks |
| TAUNTON WATER DIVISION | MA4293000 | 62,165 | Surface water | 1 | Below all study benchmarks |
| TEMPLETON MUNIC. LIGHT AND WATER PLANT | MA2294000 | 6,159 | Ground water | 4 | At or above a study benchmark |
| TEWKSBURY WATER DEPARTMENT | MA3295000 | 31,342 | Surface water | 1 | Below all study benchmarks |
| TISBURY WATER WORKS | MA4296000 | 6,082 | Ground water | 3 | Below all study benchmarks |
| TOPSFIELD WATER DEPARTMENT | MA3298000 | 5,435 | Ground water | 1 | At or above a study benchmark |
| TOWN OF AVON | MA4018000 | 4,777 | Ground water | 2 | At or above a study benchmark |
| TOWN OF EASTHAM | MA4086095 | 6,199 | Ground water | 2 | Below all study benchmarks |
| TOWNSEND WATER DEPARTMENT | MA2299000 | 6,832 | Ground water | 5 | Below all study benchmarks |
| TURNERS FALLS WATER DEPT | MA1192000 | 8,080 | Ground water | 2 | Below all study benchmarks |
| TYNGSBOROUGH WATER DISTRICT | MA3301000 | 4,416 | Surface water purchased | 2 | Below all study benchmarks |
| UPPER CAPE REGIONAL WATER COOPERATIVE | MA4261024 | 56,250 | Ground water | 3 | Below all study benchmarks |
| UPTON DPW WATER/WASTEWATER DIVISION | MA2303000 | 4,420 | Ground water | 3 | Below all study benchmarks |
| UXBRIDGE DPW, WATER DIVISION | MA2304000 | 11,612 | Ground water | 3 | At or above a study benchmark |
| WAKEFIELD WATER DEPT | MA3305000 | 27,090 | Surface water | 2 | Below all study benchmarks |
| WALPOLE WATER DEPT | MA4307000 | 24,070 | Ground water | 2 | Below all study benchmarks |
| WALTHAM WATER DEPARTMENT | MA3308000 | 65,218 | Surface water purchased | 1 | Below all study benchmarks |
| WARE WATER DEPT | MA1309000 | 10,066 | Ground water | 2 | At or above a study benchmark |
| WAREHAM FIRE DISTRICT | MA4310000 | 20,102 | Ground water | 2 | Below all study benchmarks |
| WATERTOWN WATER DEPT. (MWRA) | MA3314000 | 35,985 | Surface water purchased | 1 | Below all study benchmarks |
| WAYLAND WATER DEPARTMENT | MA3315000 | 14,096 | Ground water | 4 | At or above a study benchmark |
| WEBSTER WATER DEPARTMENT | MA2316000 | 17,776 | Ground water | 2 | Below all study benchmarks |
| WEIR RIVER WATER SYSTEM | MA4131000 | 45,339 | Surface water | 2 | Below all study benchmarks |
| WELLESLEY WATER DIVISION | MA3317000 | 29,550 | Surface water purchased | 4 | At or above a study benchmark |
| WENHAM WATER DEPT. | MA3320000 | 3,942 | Ground water | 1 | At or above a study benchmark |
| WEST BOYLSTON WATER DISTRICT | MA2321000 | 6,919 | Surface water purchased | 4 | Below all study benchmarks |
| WEST BRIDGEWATER WATER DEPT | MA4322000 | 7,709 | Ground water | 4 | Below all study benchmarks |
| WEST NEWBURY WATER DEPARTMENT | MA3324000 | 4,704 | Surface water purchased | 1 | Below all study benchmarks |
| WEST SPRINGFIELD DPW WATER DIVISION | MA1325000 | 28,835 | Ground water | 1 | Below all study benchmarks |
| WESTBOROUGH WATER DEPARTMENT | MA2328000 | 21,567 | Surface water | 5 | Below all study benchmarks |
| WESTFIELD WATER DEPT | MA1329000 | 41,094 | Surface water | 6 | Below all study benchmarks |
| WESTFORD WATER DEPARTMENT | MA3330000 | 18,848 | Groundwater under influence of surface water | 2 | Below all study benchmarks |
| WESTMINSTER DEPARTMENT OF PUBLIC WORKS | MA2332000 | 3,889 | Surface water purchased | 1 | Below all study benchmarks |
| WESTON WATER DEPT. | MA3333000 | 11,391 | Surface water purchased | 1 | Below all study benchmarks |
| WEYMOUTH WATER DEPARTMENT | MA4336000 | 57,871 | Surface water | 2 | Below all study benchmarks |
| WHATELY WATER DEPARTMENT | MA1337010 | 900 | Ground water | 1 | Below all study benchmarks |
| WHITINSVILLE WATER COMPANY | MA2216000 | 7,899 | Groundwater under influence of surface water | 2 | Below all study benchmarks |
| WHITMAN WATER SYSTEM | MA4338000 | 14,947 | Surface water purchased | 1 | Below all study benchmarks |
| WILBRAHAM WATER DEPT (MWRA) | MA1339000 | 8,533 | Surface water purchased | 1 | Below all study benchmarks |
| WILLIAMSTOWN WATER DEPT | MA1341000 | 7,326 | Ground water | 3 | Below all study benchmarks |
| WILMINGTON WATER DEPT | MA3342000 | 21,654 | Surface water purchased | 3 | Below all study benchmarks |
| WINCHENDON WATER DEPARTMENT | MA2343000 | 5,706 | Surface water purchased | 1 | Below all study benchmarks |
| WINCHESTER WATER DEPT | MA3344000 | 22,970 | Surface water | 2 | Below all study benchmarks |
| WINTHROP WATER DIVISION, (MWRA) | MA3346000 | 19,316 | Surface water purchased | 1 | Below all study benchmarks |
| WOBURN WATER DEPT. | MA3347000 | 40,876 | Surface water purchased | 2 | At or above a study benchmark |
| WORCESTER DPWP, WATER SUPPLY DIVISION | MA2348000 | 206,518 | Surface water | 1 | Below all study benchmarks |
| WRENTHAM WATER DIVISION | MA4350000 | 12,190 | Ground water | 3 | Below all study benchmarks |
| YARMOUTH WATER DEPARTMENT | MA4351000 | 38,900 | Ground water | 15 | Below all study benchmarks |
How the count works
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply Massachusetts's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.