Northfield Mt Hermon School, MA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.64 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. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Northfield Mt Hermon School
Northfield Mt Hermon School serves about 750 people through 78 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Franklin County, Massachusetts. EPA system ID: MA1106002; phone on file: 4134983455. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Northfield Mt Hermon School's lead record
Against the period ending 2025 (1.8 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Northfield Mt Hermon School is 3 ppb across 9 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.64 ppb |
| 2025 | 1.8 ppb |
| 2021 | 0 (not detected) |
| 2021 | 1.7 ppb |
| 2021 | 3 ppb |
| 2020 | 1.6 ppb |
| 2020 | 1.3 ppb |
| 2019 | 2.7 ppb |
| 2018 | 0 (not detected) |
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. Northfield Mt Hermon School's 2.64 ppb sits at the 66th percentile in Massachusetts and the 79th nationally (higher means more lead).
Neighbouring systems
24 other systems share Franklin County; 13 of them have a higher latest lead result than Northfield Mt Hermon School. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Greenfield Water Department | 17,768 | 3.32 ppb |
| Turners Falls Water Dept | 8,080 | 1.9 ppb |
| Orange Water Dept | 6,526 | 2.6 ppb |
| South Deerfield Water Supply District | 3,800 | 3 ppb |
| Sunderland Water District | 3,190 | 3.9 ppb |
| Shelburne Falls Fire District | 1,806 | 2.8 ppb |
| Bernardston Fire Water Dist | 1,471 | 1.3 ppb |
| Deerfield Fire District | 1,300 | 1.4 ppb |
| Whately Water Department | 900 | 1.5 ppb |
| Northfield Water District | 800 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Mount Hermon, 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 Northfield Mt Hermon School 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. Size matters more than most people expect: small vs large water systems.