South Norwalk Electric & Water, CT
Exceeded the action level in the past
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 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.
Who runs the water here
South Norwalk Electric & Water serves about 42,000 people through 9,682 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: CT1030021; phone on file: 203-866-3366. 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 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for South Norwalk Electric & Water is 32 ppb across 23 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 2 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 32 ppb over 15 |
| 2022 | 32 ppb over 15 |
| 2022 | 3 ppb |
| 2022 | 3 ppb |
| 2021 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 2 ppb |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
| 2016 | 2.3 ppb |
| 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. South Norwalk Electric & Water's reported as 0 (not detected) sits at the 39th 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 South Norwalk Electric & Water. 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) |
| 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 |
| Aquarion-Newtown Regional | 6,054 | 4 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Wilton, 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 South Norwalk Electric & Water 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. More in what a past exceedance means today.