What was found in ZIP 06403
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 | 2200.5 µg/L 22% of the EPA limit 10000 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 2184 µg/L 22% of the EPA limit 10000 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 2/2 | SYR4 |
| Fluoride | 1063 µg/L 27% of the EPA limit 4000 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 2/2 | SYR4 |
| Copper | 123.3 µg/L 9.5% of the EPA limit 1300 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 348.5 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| TTHM | 51.6 µg/L 65% of the EPA limit 80 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 80 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Chloroform | 40.35 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 74 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Barium | 29 µg/L 1.5% of the EPA limit 2000 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 50 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 22.03 µg/L 37% of the EPA limit 60 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 45 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 13.225 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 27 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 10.65 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 17 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Lead | 15.52 µg/L 103% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 11.15 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 14 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Nitrite | 7 µg/L 0.7% of the EPA limit 1000 µg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 6.8 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 5.68 pCi/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 5.65 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.081 pCi/L 34% of the EPA limit 15 pCi/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 3.2 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 2/2 | SYR4 |
| Bromoform | 3.1 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 0.6000 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2019
Highest in the ZIP: 1 µg/L — AQUARION-VALLEY · 13,080 people · 2019 | 2/2 | SYR4 |
| PFOA | 0.0081 µg/L No EPA limit set Highest in the ZIP: AQUARION-VALLEY · 13,080 people · 2025 | 1/2 | UCMR-5 |
| PFOS | 0.0069 µg/L No EPA limit set Highest in the ZIP: AQUARION-VALLEY · 13,080 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0068 µg/L No EPA limit set Highest in the ZIP: AQUARION-VALLEY · 13,080 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0049 µg/L No EPA limit set Highest in the ZIP: AQUARION-VALLEY · 13,080 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0046 µg/L No EPA limit set Highest in the ZIP: AQUARION-VALLEY · 13,080 people · 2025 | 1/2 | UCMR-5 |
| Pfhpa | 0.0036 µg/L No EPA limit set Highest in the ZIP: AQUARION-VALLEY · 13,080 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CTWC - NAUGATUCK REGION-CENTRAL SYSTEM · 22,735 people · 2026
Highest in the ZIP: 0.0011 mg/L — AQUARION-VALLEY · 13,080 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 06403
| Supplier | State | Population served |
|---|---|---|
| CTWC - NAUGATUCK REGION-CENTRAL SYSTEM | CT | 22,735 |
| AQUARION-VALLEY | CT | 13,080 |
Frequently asked questions about ZIP 06403 tap water
Is the tap water in ZIP 06403 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 06403. 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 06403?
2 public water suppliers report EPA drinking-water monitoring for ZIP 06403. Each is listed above with its population served.
What contaminants are in ZIP 06403'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.