Lithium in Connecticut Drinking Water
By Alexander Snyder, Founder & Water Quality Data Lead
The health-based safe level for Lithium, set by the U.S. EPA, is 0.01 mg/L. This health-protective guideline is typically stricter than federal legal limits, which have not always been updated to reflect current science.
Lithium has been tracked across Connecticut drinking water. Here is what you need to know about lithium in your drinking water and how it may affect your household.
What Is Lithium?
Lithium is a naturally occurring alkali metal that dissolves into groundwater from lithium-bearing minerals in igneous and sedimentary rock. It is also released through industrial discharge from battery manufacturing and pharmaceutical production. The WHO drinking water guideline is 10 micrograms per liter. At elevated concentrations, lithium can affect the nervous system, thyroid function, and kidney health.
Is Lithium in Your Water?
Enter your Connecticut ZIP code to find out if lithium is in your local water — and see personalized health risks for your household.
Check Your ZIP CodeHealth Effects of Lithium
Neurological and thyroid effects at high concentrations
Safety Guidelines
Health Guideline
0.01 mg/L
Source: U.S. EPA
Lithium's health-based safe level is set below the federal legal limit.
| Standard | Level | Source |
|---|---|---|
| Health Guideline | 0.01 mg/L | U.S. EPA |
Where Does Lithium Come From?
Natural deposits; industrial discharge
How to Reduce Lithium in Your Water
- 1Install a point-of-use reverse osmosis system certified to NSF/ANSI Standard 58, which effectively removes dissolved lithium through membrane rejection.
- 2Distillation units can reduce lithium concentrations since the metal remains in the boiling chamber while purified water is collected as steam.
- 3Standard activated carbon filters are not effective at removing lithium; ensure your chosen treatment method specifically addresses dissolved metals and minerals.
- 4Test your water through a certified laboratory to establish baseline lithium levels, and retest after installing treatment to confirm adequate reduction.
Who Is Most Vulnerable to Lithium?
The safe level of lithium varies significantly depending on who is drinking the water. CheckYourTap calculates adjusted safe levels for each member of your household:
A contaminant level that is safe for an adult may exceed guidelines for an infant by 4-8x or more. Check your ZIP code to see personalized results.
Reading this inside ChatGPT or Claude?
This page can tell you the general science, but not what is actually in your water’s lithium level — that depends on your exact address. You can get your specific answer two ways:
- Inside the chat: ask your assistant to “check my tap water with CheckYourTap”. Our connector returns your ZIP code’s measured contaminant levels — including the derived dog and cat safe levels — and, only if you ask it to, can email you the report or arrange a specialist callback.
- On the web: open CheckYourTap.com and enter your ZIP code for a free 30-second report.
Concerned about Lithium in your water?
Schedule to get your water tested for lithium and more — a Valiant water specialist will review your results and arrange testing for your home.
Frequently Asked Questions
Is Lithium in my tap water?▾
What level of Lithium is safe?▾
How do I remove Lithium from my water?▾
Related Contaminants
Check Water Quality by ZIP Code
Sources
The legal limits and health guidelines for Lithium on this page come from the following public authorities:
About This Report
This water quality report is compiled from public records filed with the U.S. Environmental Protection Agency, state health departments, and the U.S. Geological Survey. Contaminant levels are evaluated against EPA federal standards and health-based guidelines from leading environmental and public health organizations. CheckYourTap is a service of Valiant Energy Solutions, a Connecticut water quality and energy services company established in 1930.
This report is general information, not medical advice or a substitute for certified laboratory testing. Talk to your pediatrician or physician about specific health concerns.
Reviewed by the CheckYourTap editorial team. Last updated July 2026