Dartmouth Water Division, MA
Lead detected, under the action levels
Latest 90th-percentile lead: 7 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Dartmouth Water Division
Dartmouth Water Division serves about 24,696 people through 9,547 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Bristol County, Massachusetts. EPA system ID: MA4072000; phone on file: 5089990742. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 7 ppb from 14 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Dartmouth Water Division is 14 ppb across 9 monitoring periods, none of them over 15 ppb (2 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 7 ppb |
| 2024 | 14 ppb over 10 |
| 2023 | 3 ppb |
| 2023 | 5 ppb |
| 2022 | 8 ppb |
| 2021 | 11 ppb over 10 |
| 2021 | 7 ppb |
| 2020 | 6 ppb |
| 2017 | 8 ppb |
How Dartmouth Water Division compares
Of the 535 Massachusetts systems with a lead result, the median latest reading is 1.7 ppb; 13 are over 15 ppb right now and 66 have gone over at some point. Dartmouth Water Division's 7 ppb sits at the 91st percentile in Massachusetts and the 95th nationally (higher means more lead).
Neighbouring systems
27 other systems share Bristol County; 3 of them have a higher latest lead result than Dartmouth Water Division. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Inima Usa / Aquaria Llc | 105,643 | - |
| City Of New Bedford Dpi | 101,079 | 4.1 ppb |
| Fall River Water Department | 94,000 | 12 ppb |
| Taunton Water Division | 62,165 | 1.8 ppb |
| Attleboro Water Dept | 46,461 | 1.33 ppb |
| North Attleboro Water Dept | 31,410 | 5.1 ppb |
| Easton Water Div | 25,058 | 1.9 ppb |
| Mansfield Water Division | 21,797 | 1.9 ppb |
| Norton Water Department | 19,161 | 1.2 ppb |
| Somerset Water Department | 18,303 | 10 ppb |
Next steps for Dartmouth, MA
Test your own tap with a certified lab first-draw sample; Dartmouth, MA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Dartmouth Water Division whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. The lead result guide covers how utilities pick the homes they sample. The action level is dropping - the 10 ppb rule from 2027.