Knob Hill Condominiums, CT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Knob Hill Condominiums serves about 84 people through 28 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in New London County, Connecticut. EPA system ID: CT0280051; phone on file: 203-248-5541. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Knob Hill Condominiums's lead record
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Knob Hill Condominiums is 8 ppb across 21 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 1 ppb |
| 2024 | 2 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2023 | 1 ppb |
| 2022 | 1 ppb |
| 2022 | 1 ppb |
| 2021 | 1 ppb |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2020 | 8 ppb |
| 2019 | 3 ppb |
| 2019 | 3 ppb |
| 2018 | 0 (not detected) |
| 2018 | 1 ppb |
| 2017 | 3 ppb |
| 2017 | 5 ppb |
| 2016 | 1 ppb |
| 2016 | 2 ppb |
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. Knob Hill Condominiums's reported as 0 (not detected) sits at the 11th percentile in Connecticut and the 8th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
82 other systems share New London County; 44 of them have a higher latest lead result than Knob Hill Condominiums. 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) |
What to do in your house
Look up your address in Knob Hill Condominiums's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Knob Hill 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Small systems behave differently: why small systems go over more often.