Deerfield Estates, MA
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 13 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. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Deerfield Estates serves about 100 people through 46 service connections, which makes it a very small system under EPA's size classes. It is federally owned and draws groundwater, in Middlesex County, Massachusetts. EPA system ID: MA2139006; phone on file: 5083578825. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 6 ppb from 7 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Deerfield Estates is 13 ppb across 11 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 13 ppb over 10 |
| 2025 | 7 ppb |
| 2023 | 8 ppb |
| 2021 | 10 ppb |
| 2020 | 4 ppb |
| 2020 | 9 ppb |
| 2020 | 7 ppb |
| 2018 | 9.4 ppb |
| 2018 | 8 ppb |
| 2016 | 7.1 ppb |
| 2016 | 8 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. Deerfield Estates's 13 ppb sits at the 97th percentile in Massachusetts and the 98th nationally (higher means more lead).
Nearby utilities
94 other systems share Middlesex County; 0 of them have a higher latest lead result than Deerfield Estates. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lowell Regional Water Utility | 120,418 | 0 (not detected) |
| Cambridge Water Department | 118,214 | 8 ppb |
| Newton Water Dept. (Mwra) | 88,931 | 1.09 ppb |
| Somerville Water Dept. (Mwra) | 81,045 | 6.62 ppb |
| Framingham Water Dept. (Mwra) | 72,362 | 1.74 ppb |
| Malden Water Division (Mwra) | 66,263 | 9.74 ppb |
| Waltham Water Department | 65,218 | 2.24 ppb |
| Medford Water Dept. (Mwra) | 61,700 | 8.31 ppb |
| Everett Water Dept. (Mwra) | 49,075 | 1.25 ppb |
| Arlington Water Dept. (Mwra) | 46,308 | 2.68 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Southborough, 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 Deerfield Estates whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1520 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. Why sampled homes are the worst-case ones is in the guide to reading the number. This system is in the band the 2027 10 ppb rule changes.