Menemsha Water Company, MA
Exceeded the action level in the past
Latest 90th-percentile lead: 2.33 ppb (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 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.
About Menemsha Water Company
Menemsha Water Company serves about 841 people through 95 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Dukes County, Massachusetts. EPA system ID: MA4062000; phone on file: 5083262326. They can tell you what your service line is made of and whether they pay to replace it.
Menemsha Water Company's lead record
That is up 2.33 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Menemsha Water Company is 62 ppb across 13 monitoring periods, 4 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.33 ppb |
| 2025 | 0 (not detected) |
| 2024 | 9.1 ppb |
| 2024 | 21 ppb over 15 |
| 2023 | 7.4 ppb |
| 2022 | 40 ppb over 15 |
| 2021 | 21 ppb over 15 |
| 2021 | 9 ppb |
| 2021 | 12 ppb over 10 |
| 2020 | 15 ppb over 10 |
| 2019 | 62 ppb over 15 |
| 2016 | 5.8 ppb |
| 2016 | 12 ppb over 10 |
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. Menemsha Water Company's 2.33 ppb sits at the 60th percentile in Massachusetts and the 76th nationally (higher means more lead).
Nearby utilities
6 other systems share Dukes County; 3 of them have a higher latest lead result than Menemsha Water Company. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Oak Bluffs Water District | 24,000 | 3.9 ppb |
| Edgartown Water Department | 8,027 | 6 ppb |
| Tisbury Water Works | 6,082 | 7.2 ppb |
| Gosnold Water Dept | 425 | 1.2 ppb |
| Kuehns Way Llc | 80 | 0 (not detected) |
| Scotts Grove Llc | 36 | 0 (not detected) |
Next steps for Chilmark, MA
Test your own tap with a certified lab first-draw sample; Chilmark, 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 Menemsha Water Company whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1800 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. The lead result guide covers how utilities pick the homes they sample. Why an old exceedance still matters: over the limit before, under it now.