Medway Water Department, MA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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 Medway Water Department
Medway Water Department serves about 14,176 people through 3,862 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 Norfolk County, Massachusetts. EPA system ID: MA2177000; phone on file: 5085333275. They can tell you what your service line is made of and whether they pay to replace it.
Medway Water Department's lead record
That is down 4.9 ppb from 4.9 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Medway Water Department is 5 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 4.9 ppb |
| 2023 | 5 ppb |
| 2022 | 2 ppb |
| 2021 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2021 | 2 ppb |
| 2018 | 2 ppb |
How Medway Water Department 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. Medway Water Department's reported as 0 (not detected) sits at the 22nd percentile in Massachusetts and the 38th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
38 other systems share Norfolk County; 31 of them have a higher latest lead result than Medway Water Department. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tri Town Water Board | 856,000 | - |
| Quincy Water Dept. (Mwra) | 106,000 | 14.4 ppb |
| Brookline Water And Sewer Division | 63,191 | 2 ppb |
| Weymouth Water Department | 57,871 | 1.2 ppb |
| Randolph/Holbrook Joint Water Board | 46,519 | - |
| Dedham Westwood Water Dist. | 41,630 | 2 ppb |
| Braintree Water And Sewer Dept. | 39,143 | 4.8 ppb |
| Randolph Water Department | 35,114 | 3 ppb |
| Franklin Water Department | 33,706 | 5 ppb |
| Needham Water Dept | 31,664 | 2 ppb |
Next steps for Medway, MA
Look up your address in Medway Water Department'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 Medway Water Department 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.