County · Massachusetts
Middlesex County, Massachusetts: drinking water records
This overview covers 81 ZIP codes and 96 community water systems in Middlesex County. It also stands in for 1 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Lowell Regional Water Utility MA3160000 | 120,418 | 120 | 3 | 1 | 0 ppb |
| Somerville Water Dept. (MWRA) MA3274000 | 81,045 | 120 | 0 | 1 | 3.9 ppb |
| Medford Water Dept. (MWRA) MA3176000 | 61,700 | 120 | 0 | 2 | 8.4 ppb |
| Billerica Water Works MA3031000 | 42,119 | 120 | 5 | 3 | 2.4 ppb |
| Tewksbury Water Department MA3295000 | 31,342 | 120 | 3 | 2 | 1 ppb |
| Melrose Water Division (MWRA) MA3178000 | 29,938 | 120 | 0 | 1 | 10.2 ppb |
| Reading Water Department (MWRA) MA3246000 | 26,262 | 120 | 0 | 1 | 8.4 ppb |
| Stoneham Water Dept (MWRA Supply) MA3284000 | 23,244 | 120 | 0 | 1 | 1.4 ppb |
| Wilmington Water Dept MA3342000 | 21,654 | 300 | 2 | 1 | 1.8 ppb |
| Concord Water Dept MA3067000 | 18,788 | 330 | 4 | 2 | 5.1 ppb |
| Sudbury Water District MA3288000 | 18,416 | 300 | 6 | 1 | 3.5 ppb |
| North Reading Water Dept. MA3213000 | 16,379 | 120 | 3 | 4 | 1.7 ppb |
| Holliston Water Department MA2136000 | 15,139 | 190 | 5 | 4 | 2.9 ppb |
| Hanscom Afb MA3023002 | 11,789 | 240 | 0 | 1 | 4.8 ppb |
| Lincoln Water Dept MA3157000 | 5,593 | 240 | 3 | 1 | 2.2 ppb |
| Cambridge Water Department MA3049000 | 118,214 | 120 | 3 | 0 | 8 ppb |
| Newton Water Dept. (MWRA) MA3207000 | 88,931 | 120 | 0 | 0 | 1.3 ppb |
| Framingham Water Dept. (MWRA) MA3100000 | 72,362 | 120 | 0 | 0 | 1.6 ppb |
| Malden Water Division (MWRA) MA3165000 | 66,263 | 120 | 0 | 0 | 9.7 ppb |
| Waltham Water Department MA3308000 | 65,218 | 120 | 0 | 0 | 1.9 ppb |
| Everett Water Dept. (MWRA) MA3093000 | 49,075 | 120 | 0 | 0 | 5.7 ppb |
| Arlington Water Dept. (MWRA) MA3010000 | 46,308 | 120 | 0 | 0 | 2.8 ppb |
| Marlborough DPW Water Div. (MWRA) MA2170000 | 41,799 | 120 | 0 | 0 | 3.3 ppb |
| Woburn Water Dept. MA3347000 | 40,876 | 180 | 6 | 0 | 1.3 ppb |
| Natick Water and Sewer Division MA3198000 | 37,006 | 240 | 6 | 0 | 0 ppb |
ZIP reports in Middlesex County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 01431.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.