Wrentham Developmental Center, MA
Exceeded the action level in the past
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 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.
Who runs the water here
Wrentham Developmental Center serves about 937 people through 59 service connections, which makes it a small system under EPA's size classes. It is owned by the state and draws groundwater, in Norfolk County, Massachusetts. EPA system ID: MA4350001; phone on file: 5083843114. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 5 ppb from 5 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Wrentham Developmental Center is 46 ppb across 6 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 5 ppb |
| 2024 | 1 ppb |
| 2023 | 46 ppb over 15 |
| 2020 | 10 ppb |
| 2020 | 7 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. Wrentham Developmental Center's reported as 0 (not detected) sits at the 14th percentile in Massachusetts and the 26th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Norfolk County
38 other systems share Norfolk County; 31 of them have a higher latest lead result than Wrentham Developmental Center. 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 |
What to do in your house
Test your own tap with a certified lab first-draw sample; Wrentham, 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 Wrentham Developmental Center 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. Why sampled homes are the worst-case ones is in the guide to reading the number. More in what a past exceedance means today.