Masac Plymouth, MA
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2022-2024). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Masac Plymouth at a glance
Masac Plymouth serves about 210 people through 3 service connections, which makes it a very small system under EPA's size classes. It is owned by the state and draws groundwater, in Plymouth County, Massachusetts. EPA system ID: MA4239010; phone on file: 5082912441. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Masac Plymouth's lead record
That is down 7 ppb from 7 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Masac Plymouth is 207 ppb across 10 monitoring periods, 4 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2024 | 7 ppb |
| 2023 | 1 ppb |
| 2021 | 22 ppb over 15 |
| 2021 | 23 ppb over 15 |
| 2020 | 89 ppb over 15 |
| 2020 | 207 ppb over 15 |
| 2019 | 9 ppb |
| 2018 | 3 ppb |
| 2018 | 3 ppb |
How Masac Plymouth 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. Masac Plymouth's reported as 0 (not detected) sits at the 11th percentile in Massachusetts and the 16th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
44 other systems share Plymouth County; 32 of them have a higher latest lead result than Masac Plymouth. 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 |
Next steps for Milford, MA
Test your own tap with a certified lab first-draw sample; Milford, 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 Masac Plymouth whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2095 ppb (copper action level 1,300 ppb).
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. What a 90th-percentile result does and does not tell you: how to read a lead result. Why an old exceedance still matters: over the limit before, under it now.