NORWALK FIRST TAXING DISTRICT
CT · PWS ID CT1030011 · Community water system
106
contaminants tested
20
detected
40,256
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFOA | 0.0095 ug/L | 5/6 | 2024 |
| PFPeA | 0.0054 ug/L | 3/6 | 2024 |
| PFBS | 0.0064 ug/L | 2/6 | 2024 |
| PFHxA | 0.0048 ug/L | 2/6 | 2024 |
| PFHxS | 0.0042 ug/L | 2/6 | 2024 |
| PFOS | 0.0112 ug/L | 2/6 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| COPPER, FREE | 390 UG/L | 287/296 | SYR4 | 2012–2019 |
| TTHM | 88.8 UG/L | 156/156 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 48.4 UG/L | 156/156 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0531 mg/L | 47/47 | LCR | 2025 |
| Lead | 73 UG/L | 38/296 | SYR4 | 2012–2019 |
| Nitrate | 2810 UG/L | 34/34 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 2810 UG/L | 24/24 | SYR4 | 2012–2019 |
| Chloroform | 9.4 UG/L | 22/35 | SYR4 | 2012–2019 |
| Barium | 23 UG/L | 19/19 | SYR4 | 2012–2019 |
| Fluoride | 810 UG/L | 19/19 | SYR4 | 2012–2019 |
| Bromodichloromethane | 4.9 UG/L | 8/35 | SYR4 | 2012–2019 |
| Dibromochloromethane | 1.2 UG/L | 8/35 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 4.4 PCI/L | 1/8 | SYR4 | 2013–2018 |
| cis-1,2-Dichloroethylene | 0.7000 UG/L | 1/35 | SYR4 | 2012–2019 |
86 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalArsenicAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalBromoformCHLOROBENZENECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneChromiumCombined Radium (-226 and -228)Combined UraniumDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon and UHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBAPFDAPFDoAPFEESAPFHpAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chloridelithiumo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene
Areas served
NEW CANAANNORWALKWESTPORTWILTON