Sea Oaks Condominiums, MA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.35 ppb (monitoring period 2023-2025). 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.
Who runs the water here
Sea Oaks Condominiums serves about 222 people through 19 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Barnstable County, Massachusetts. EPA system ID: MA4172033; phone on file: 6173528633. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2023 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sea Oaks Condominiums is 13.1 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.35 ppb |
| 2023 | 1 ppb |
| 2022 | 13.1 ppb over 10 |
| 2019 | 0 (not detected) |
How Sea Oaks Condominiums 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. Sea Oaks Condominiums's 1.35 ppb sits at the 41st percentile in Massachusetts and the 61st nationally (higher means more lead).
Other water systems in Barnstable County
29 other systems share Barnstable County; 14 of them have a higher latest lead result than Sea Oaks Condominiums. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Falmouth Water Dept | 97,551 | 1.1 ppb |
| Dennis Water District | 65,000 | 0 (not detected) |
| Upper Cape Regional Water Cooperative | 56,250 | - |
| Centerville Osterville Marstons Mills Wd | 50,000 | 1.82 ppb |
| Harwich Water Department | 39,144 | 0 (not detected) |
| Yarmouth Water Department | 38,900 | 1.5 ppb |
| Mashpee Water District | 36,922 | 1.4 ppb |
| Hyannis Water System, Town Of Barnstable | 35,000 | 0 (not detected) |
| Brewster Water Department | 35,000 | 3.4 ppb |
| Chatham Water Department | 30,000 | 1.05 ppb |
Next steps for Barnstable, MA
Test your own tap with a certified lab first-draw sample; Barnstable, 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 Sea Oaks Condominiums 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. The action level is dropping - the 10 ppb rule from 2027.