What was found in ZIP 06840
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2360.85 µg/L 24% of the EPA limit 10000 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 2051.65 µg/L 21% of the EPA limit 10000 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019 | 1/2 | SYR4 |
| Fluoride | 792 µg/L 20% of the EPA limit 4000 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019 | 1/2 | SYR4 |
| Copper | 200 µg/L 15% of the EPA limit 1300 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019
Highest in the ZIP: 399 µg/L — AQUARION-NEW CANAAN · 10,097 people · 2017 | 2/2 | SYR4 |
| TTHM | 69.625 µg/L 87% of the EPA limit 80 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019
Highest in the ZIP: 73.3 µg/L — AQUARION-NEW CANAAN · 10,097 people · 2019 | 2/2 | SYR4 |
| Chloroform | 8.825 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019
Highest in the ZIP: 61.65 µg/L — AQUARION-NEW CANAAN · 10,097 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 34.4 µg/L 57% of the EPA limit 60 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019
Highest in the ZIP: 45.7 µg/L — AQUARION-NEW CANAAN · 10,097 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 25 µg/L No EPA limit set Highest in the ZIP: AQUARION-NEW CANAAN · 10,097 people · 2019 | 1/2 | SYR4 |
| Barium | 22.1 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 19 µg/L No EPA limit set Highest in the ZIP: AQUARION-NEW CANAAN · 10,097 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 4.41 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019
Highest in the ZIP: 14.65 µg/L — AQUARION-NEW CANAAN · 10,097 people · 2019 | 2/2 | SYR4 |
| Lead | 13.75 µg/L 92% of the EPA limit 15 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 1.13 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019
Highest in the ZIP: 6 µg/L — AQUARION-NEW CANAAN · 10,097 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 4.4 pCi/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2018 | 1/2 | SYR4 |
| Bromoform | 3 µg/L No EPA limit set Highest in the ZIP: AQUARION-NEW CANAAN · 10,097 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set Highest in the ZIP: AQUARION-NEW CANAAN · 10,097 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 2 µg/L No EPA limit set Highest in the ZIP: AQUARION-NEW CANAAN · 10,097 people · 2019 | 1/2 | SYR4 |
| cis-1,2-Dichloroethylene | 0.7000 µg/L 1% of the EPA limit 70 µg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2019 | 1/2 | SYR4 |
| PFOS | 0.0112 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2024 | 1/2 | UCMR-5 |
| PFOA | 0.0095 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2024 | 2/2 | UCMR-5 |
| PFBS | 0.0064 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0054 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2024 | 2/2 | UCMR-5 |
| Pfhxa | 0.0048 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2024 | 2/2 | UCMR-5 |
| PFHXS | 0.0042 µg/L No EPA limit set Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: NORWALK FIRST TAXING DISTRICT · 40,256 people · 2025 | 2/2 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
Water suppliers serving ZIP 06840
| Supplier | State | Population served |
|---|---|---|
| NORWALK FIRST TAXING DISTRICT | CT | 40,256 |
| AQUARION-NEW CANAAN | CT | 10,097 |
Frequently asked questions about ZIP 06840 tap water
Is the tap water in ZIP 06840 safe to drink?
EPA testing detected 25 contaminants across the water suppliers serving ZIP 06840. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 06840?
2 public water suppliers report EPA drinking-water monitoring for ZIP 06840. Each is listed above with its population served.
What contaminants are in ZIP 06840's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.