Scwa, Oakdale Heights Division, CT
Exceeded the action level in the past
Latest 90th-percentile lead: 7.2 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 Scwa, Oakdale Heights Division
Scwa, Oakdale Heights Division serves about 876 people through 219 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in New London County, Connecticut. EPA system ID: CT0860031; phone on file: 860-464-0232. 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 2025 (7.6 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Scwa, Oakdale Heights Division is 25 ppb across 13 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 7.2 ppb |
| 2025 | 7.6 ppb |
| 2025 | 8.4 ppb |
| 2024 | 2.6 ppb |
| 2024 | 3.5 ppb |
| 2023 | 0.9 ppb |
| 2023 | 0 (not detected) |
| 2022 | 1.4 ppb |
| 2022 | 25 ppb over 15 |
| 2022 | 0 (not detected) |
| 2021 | 1.5 ppb |
| 2021 | 0 (not detected) |
| 2016 | 0 (not detected) |
Against other Connecticut systems
Of the 493 Connecticut systems with a lead result, the median latest reading is 0.8 ppb; 2 are over 15 ppb right now and 49 have gone over at some point. Scwa, Oakdale Heights Division's 7.2 ppb sits at the 96th percentile in Connecticut and the 95th nationally (higher means more lead).
Neighbouring systems
82 other systems share New London County; 2 of them have a higher latest lead result than Scwa, Oakdale Heights Division. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Norwich Public Utilities | 36,163 | 0 (not detected) |
| Groton Utilities | 30,200 | 1.1 ppb |
| New London Dept. Of Public Utilities | 27,620 | 0 (not detected) |
| Waterford Wpca | 16,578 | 1.5 ppb |
| East Lyme Water & Sewer Commission | 15,245 | 0 (not detected) |
| Aquarion-Mystic | 10,788 | 0 (not detected) |
| Jewett City Water Company | 6,840 | 0 (not detected) |
| Colchester Sewer & Water Commission | 4,020 | 0 (not detected) |
| Ctwc - Shoreline Region-Sound View | 3,397 | 0 (not detected) |
| Ledyard Wpca - Ledyard Center | 3,294 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Gales Ferry, CT 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 Scwa, Oakdale Heights Division whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1570 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Why an old exceedance still matters: over the limit before, under it now.