Norwalk First Taxing District, 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.
Norwalk First Taxing District at a glance
Norwalk First Taxing District serves about 40,256 people through 11,042 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Fairfield County, Connecticut. EPA system ID: CT1030011; phone on file: 203-847-7387. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 3 ppb from 3 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Norwalk First Taxing District is 3 ppb across 20 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 3 ppb |
| 2024 | 0 (not detected) |
| 2024 | 1 ppb |
| 2023 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2022 | 2 ppb |
| 2021 | 2 ppb |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 1 ppb |
| 2017 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
Where this result ranks
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. Norwalk First Taxing District's reported as 0 (not detected) sits at the 38th percentile in Connecticut and the 39th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
58 other systems share Fairfield County; 39 of them have a higher latest lead result than Norwalk First Taxing District. 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) |
| 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 |
| Aquarion-Newtown Regional | 6,054 | 4 ppb |
Next steps for Norwalk, CT
Look up your address in Norwalk First Taxing District'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 Norwalk First Taxing District 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.