Contaminants in Connecticut Drinking Water
The preserved Connecticut catalog contains 59 contaminant identities organized into 7 categories. ZIP counts describe historical public-system record associations, not a current property measurement, exposure, or safety conclusion.
59
Contaminants
7
Categories
All
Families + Pets
Review records associated with a ZIP
Enter your ZIP code to review associated public-system records or regional groundwater context. The lookup does not identify a serving utility or test a property.
Check Your ZIP CodeHeavy Metals
(1)Metals represented in public drinking-water records, including contaminants with health-protective references below federal legal limits.
Inorganic Chemicals
(12)Minerals and inorganic compounds associated with geology, treatment, plumbing, agriculture, or industrial sources.
PFAS (Forever Chemicals)
(29)Persistent fluorinated compounds reviewed against exact released health references and separate federal regulatory limits.
Radionuclides
(2)Radiological analytes and screening measurements commonly associated with rock, soil, and groundwater geology.
Pesticides & Herbicides
(8)Agricultural and pest-control chemicals that can reach surface water or groundwater through use, runoff, and soil movement.
Organic Chemicals
(1)Carbon-based compounds associated with industrial processes, treatment byproducts, agriculture, and consumer products.
Other Compounds
(6)Additional analytes retained in the Connecticut public-record catalog with source and reference limits stated on their detail pages.
Healthy water is not defined by legal compliance alone
CheckYourTap treats exact released health references from the Environmental Working Group and California’s Office of Environmental Health Hazard Assessment as the health-first frame. EPA maximum contaminant levels remain important, but they are shown separately as enforceable legal and regulatory context rather than used as the definition of healthy.
A health reference appears only when the released source matches the exact analyte and unit. If that match is absent, the detail page says so instead of borrowing a value from a related chemical, converting an unknown denominator into a percentage, or treating “not listed” as zero risk.
Children, pregnancy, older adults, and pets can require different research context. Those sections remain available throughout CheckYourTap, but this index does not infer a person’s or animal’s exposure from a ZIP association. Pet pages preserve source-reviewed evidence and do not invent a dog- or cat-safe numeric threshold where the research has not established one.
Browse by Location
See water quality reports for specific Connecticut cities and ZIP codes.