Lead in Connecticut Drinking Water — 293 ZIPs Tested
EPA data analysis for lead in Connecticut drinking water systems
Lead Contamination in Connecticut
ZipCheckup analyzed drinking water data across 433 ZIP codes in Connecticut for lead contamination. 293 ZIP codes have reported lead detections, and 115 have EPA violations on record.
The violation rate for lead in Connecticut is 26.6% of all ZIP codes — higher than the national average.
EPA Standard for Lead
The EPA maximum contaminant level (MCL) for lead is 15 ppb (action level), governed by the Lead and Copper Rule (LCRR/LCRI). Water systems that exceed this limit must take corrective action and notify consumers.
Worst ZIP Codes for Lead in Connecticut
These ZIP codes reported the highest lead levels in Connecticut based on CCR reports and EPA data:
Lowest Lead Levels in Connecticut
These ZIP codes had the lowest reported lead detections in Connecticut:
Health Effects of Lead
Lead is a potent neurotoxin with no safe level of exposure. In children, lead causes developmental delays, reduced IQ, and behavioral problems. In adults, it causes high blood pressure, kidney damage, and cardiovascular effects. Pregnant women face increased risk of premature birth.
How to Remove Lead From Drinking Water
The most effective treatment for lead removal is Reverse Osmosis or NSF 53 Carbon Block. Look for filters certified under NSF 53 / NSF 58 standards.
Check Your ZIP Code
Use the ZipCheckup water quality search to see lead data for your specific water system in Connecticut.
Worst ZIP Codes for Lead in Connecticut
Ranked by highest lead detection level.
| Rank | ZIP Code | City | Level Detected | EPA Limit | Status |
|---|---|---|---|---|---|
| 1 | 06235 | Chaplin | 15 ppb | 15 ppb | Within Limit |
| 2 | 06241 | Dayville | 15 ppb | 15 ppb | Within Limit |
| 3 | 06414 | Cobalt | 15 ppb | 15 ppb | Within Limit |
| 4 | 06489 | Southington | 14.3 ppb | 15 ppb | Within Limit |
| 5 | 06444 | Marion | 14.3 ppb | 15 ppb | Within Limit |
| 6 | 06467 | Milldale | 14.3 ppb | 15 ppb | Within Limit |
| 7 | 06479 | Plantsville | 14.3 ppb | 15 ppb | Within Limit |
| 8 | 06752 | Bridgewater | 13 ppb | 15 ppb | Within Limit |
| 9 | 06477 | Orange | 12 ppb | 15 ppb | Within Limit |
| 10 | 06076 | Stafford Springs | 10 ppb | 15 ppb | Within Limit |
| 11 | 06339 | Ledyard | 10 ppb | 15 ppb | Within Limit |
| 12 | 06481 | Rockfall | 10 ppb | 15 ppb | Within Limit |
| 13 | 06010 | Bristol | 9 ppb | 15 ppb | Within Limit |
| 14 | 06011 | Bristol | 9 ppb | 15 ppb | Within Limit |
| 15 | 06071 | Somers | 8 ppb | 15 ppb | Within Limit |
| 16 | 06281 | Woodstock | 8 ppb | 15 ppb | Within Limit |
| 17 | 06063 | Barkhamsted | 7 ppb | 15 ppb | Within Limit |
| 18 | 06067 | Rocky Hill | 7 ppb | 15 ppb | Within Limit |
| 19 | 06101 | Hartford | 7 ppb | 15 ppb | Within Limit |
| 20 | 06102 | Hartford | 7 ppb | 15 ppb | Within Limit |
Lowest Lead Levels in Connecticut
Cities with Lead Data in Connecticut
93 cities in Connecticut have lead testing data available.
+ 73 more cities