Water Quality

Disinfection

Disinfection is a key piece of potable water treatment and is regulated under the Safe Drinking Water Act. MWRD uses sodium hypochlorite to disinfect resulting in the deactivation of water borne viruses, bacteria, and microbes. EPA and TDEC Regulations require the disinfection residual in the distribution system be between 0.2 mg/L and 4.0 mg/L.

Fluoride

MWRD adds fluoride to the drinking water to reduce the risk of dental cavities, particularly in children and those with little access to routine dental care. Fluoride levels in MWRD water supply follows the current EPA and TDEC recommendations and averages 0.70 mg/L. The Centers for Disease Control, US Surgeon General, American Dental Association, American Medical Association, American Academy of Pediatrics, American Association of Public Health Dentistry and many other prominent health associations fully support fluoridation of drinking water for public health.

Corrosion Control

MWRD has an active corrosion control program to both mitigate lead and copper corrosion and protect customer plumbing. Our program consists of lime softening, alkalinity adjustment, pH adjustment, and the addition of a corrosion inhibitor known as orthophosphate. MWRD has removed all known lead services lines in the distribution system but cannot control the variety of materials used in plumbing components. Some suggested ways to reduce potential exposure include:

• Flush plumbing before drinking, cooking, or preparing infant formula. Let the water from the cold-water tap run for 30 seconds to two (2) minutes.
• Never use water from the hot water tap for drinking, preparing food, or infant formula.
• Contact a local certified plumber if you are concerned your plumbing may have lead containing components.