Weir River Water System, MA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
About Weir River Water System
Weir River Water System serves about 45,339 people through 12,755 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 Plymouth County, Massachusetts. EPA system ID: MA4131000; phone on file: 7818042304. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2025 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Weir River Water System is 3 ppb across 11 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 1 ppb |
| 2024 | 0 (not detected) |
| 2023 | 2 ppb |
| 2022 | 2 ppb |
| 2021 | 2 ppb |
| 2019 | 2 ppb |
| 2018 | 1 ppb |
| 2017 | 1 ppb |
| 2016 | 1 ppb |
| 2016 | 3 ppb |
Against other Massachusetts systems
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. Weir River Water System's reported as 0 (not detected) sits at the 24th percentile in Massachusetts and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Plymouth County
44 other systems share Plymouth County; 32 of them have a higher latest lead result than Weir River Water System. 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 |
| 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 |
| Duxbury Water Department | 16,387 | 4.4 ppb |
Next steps for Hingham, MA
Look up your address in Weir River Water System's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Weir River Water System 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. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.