Aquarion-Possum Ridge, CT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
About Aquarion-Possum Ridge
Aquarion-Possum Ridge serves about 307 people through 106 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Fairfield County, Connecticut. EPA system ID: CT0910041; phone on file: 203-926-4320. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is down 2 ppb from 2 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Aquarion-Possum Ridge is 7 ppb across 16 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 2 ppb |
| 2024 | 3 ppb |
| 2024 | 0 (not detected) |
| 2023 | 3 ppb |
| 2023 | 0 (not detected) |
| 2022 | 2 ppb |
| 2022 | 2 ppb |
| 2021 | 2 ppb |
| 2021 | 4 ppb |
| 2020 | 3 ppb |
| 2020 | 2 ppb |
| 2019 | 1 ppb |
| 2019 | 2 ppb |
| 2018 | 7 ppb |
| 2017 | 3 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. Aquarion-Possum Ridge's reported as 0 (not detected) sits at the 23rd percentile in Connecticut and the 19th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Fairfield County
58 other systems share Fairfield County; 39 of them have a higher latest lead result than Aquarion-Possum Ridge. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Aquarion-Eastern Fairfield County | 351,756 | 0 (not detected) |
| Aquarion-Stamford | 119,214 | 0 (not detected) |
| Danbury Water Department | 62,055 | 0 (not detected) |
| Aquarion-Greenwich | 53,297 | 0 (not detected) |
| South Norwalk Electric & Water | 42,000 | 0 (not detected) |
| Norwalk First Taxing District | 40,256 | 0 (not detected) |
| Aquarion-Darien | 18,737 | 2 ppb |
| Aquarion-New Canaan | 10,097 | 0 (not detected) |
| Bethel Water Dept | 9,507 | 0 (not detected) |
| Aquarion-Ridgefield | 7,476 | 3.1 ppb |
What to do in your house
Look up your address in Aquarion-Possum Ridge'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 Aquarion-Possum Ridge 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.