City of Twin Falls

Where does my water come from? All of Twin Falls' water is sourced from groundwater wells. During summer months, the Blue Lakes Wells provide most of the irrigation and household water. In winter, wells at the south side of the river supply the majority of water, with Blue Lakes wells used for blending to meet arsenic regulations.

Is my water safe? We're pleased to present this year's Annual Water Quality Report (Consumer Confidence Report) as required by the Safe Drinking Water Act. This document provides information about your water source, contents, and how it compares to regulatory standards. This report represents last year's water quality assessment. We remain dedicated to providing transparent information because informed residents are our greatest allies.

Do I need to take special precautions? Certain individuals may be more vulnerable to water contaminants than the general population. Those with compromised immune systems—including cancer patients undergoing chemotherapy, organ transplant recipients, people with HIV/AIDS, some elderly individuals, and infants—may face increased risk from infections. These individuals should consult healthcare providers about their drinking water. EPA/CDC guidelines on reducing infection risk from Cryptosporidium and other microbial contaminants are available through the Safe Water Drinking Hotline (800-426-4791).

Why are there contaminants in my tap water? All drinking water, including bottled varieties, naturally contains small amounts of some contaminants. Their presence doesn't necessarily indicate a health risk. For more information about contaminants and potential health effects, contact the EPA's Safe Drinking Water Hotline (800-426-4791).

Description of Water Treatment Process: Your water undergoes disinfection treatment, which involves adding chlorine or other disinfectants to eliminate harmful bacteria and microorganisms. Disinfection is recognized as one of the most significant public health advancements of the 20th century.

1. What causes water hardness in Twin Falls?

   The groundwater in Twin Falls absorbs minerals like calcium and magnesium as it passes through underground rock formations, resulting in hard water conditions that can affect appliance efficiency and cleaning effectiveness.

2. How often is Twin Falls' water tested?

   The municipal water supply undergoes rigorous testing on a schedule determined by EPA regulations, with some contaminants tested daily and others annually or quarterly.

3. What can residents do about water quality concerns?

   Residents can install whole-house filtration systems designed for the specific contaminants present in Twin Falls water, or use point-of-use filters for drinking and cooking purposes.