Middleborough Water Supply, MA
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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.
Who runs the water here
Middleborough Water Supply serves about 15,350 people through 6,281 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 groundwater, in Plymouth County, Massachusetts. EPA system ID: MA4182000; phone on file: 5089462482. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2024 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Middleborough Water Supply is 5 ppb across 11 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3 ppb |
| 2024 | 2 ppb |
| 2024 | 5 ppb |
| 2023 | 2 ppb |
| 2022 | 2 ppb |
| 2021 | 2 ppb |
| 2020 | 2 ppb |
| 2020 | 2 ppb |
| 2019 | 4 ppb |
| 2019 | 3 ppb |
| 2016 | 3 ppb |
Where this result ranks
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. Middleborough Water Supply's 3 ppb sits at the 71st percentile in Massachusetts and the 83rd nationally (higher means more lead).
Nearby utilities
44 other systems share Plymouth County; 13 of them have a higher latest lead result than Middleborough Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Brockton Water Department | 105,788 | 4 ppb |
| Plymouth Water Department | 47,100 | 2.5 ppb |
| Weir River Water System | 45,339 | 0 (not detected) |
| Marshfield Water Department | 34,000 | 4 ppb |
| Abington/Rockland Joint Wtr. Works | 33,387 | 4 ppb |
| Mattapoisett River Valley W.D. | 29,600 | - |
| Bridgewater Water Department | 28,633 | 3 ppb |
| Wareham Fire District | 20,102 | 2 ppb |
| Scituate Water Division | 19,297 | 2 ppb |
| Pembroke Water Division Dpw | 18,175 | 3 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Middleborough, 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 Middleborough Water Supply 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. Size matters more than most people expect: small vs large water systems.