Chattanooga, Tennessee Water Outage Today

Who runs the water in Chattanooga: system profile

The system behind most taps in Chattanooga is Tennessee American Water, which EPA records list as serving roughly 207,046 people.

What feeds the taps in Chattanooga

Chattanooga drinks surface water. Tennessee American Water draws it from the Tennessee River and treats it before it goes into the distribution system. Treatment points named in EPA's facility list include Filter Plant. After treatment the water is held in 2 storage tanks and reservoirs, which is the buffer that keeps taps running for a few hours after a pump or main fails.

What this means in an outage. Surface water needs a treatment plant running around the clock, so a plant shutdown, a raw-water pump failure or a long power cut at the plant can lower pressure across the whole service area, not just on one street. Boil water notices are more likely to be citywide after that kind of failure than after a single main break.

Why the water goes out in Chattanooga

Which failures hit Chattanooga hardest follows from its weather, its housing stock and how it is supplied.

• Freezing weather. Chattanooga sees about 57 days a year with a low at or below 32°F, and 5 days at or below 20°F. The coldest morning in the 2015 through 2025 record came on February 19, 2015. The longest stretch with highs that never rose above freezing ran 3 days, ending January 8, 2017. Frost pushes into shallow service lines first. Mains follow when the ground heaves and thaws, which is why break counts climb a day or two after the temperature swings.
• Older neighborhoods and pipe. 42.4% of occupied homes in Chattanooga were built before 1970, against 35.5% nationally. Streets of that age tend to sit on cast iron and early steel mains that are near or past their design life, which is where most breaks start.
• Flooding and heavy rain. NOAA logged 46 flood, flash flood and heavy rain reports in Hamilton County from 2015 through 2026, and 12 days a year bring an inch of rain or more. Flooding is hard on water systems in three ways: it erodes soil around pipe crossings, drowns pumps and electrical equipment, and can let contaminated runoff into the mains, which triggers precautionary boil notices.
• Summer demand. Chattanooga has about 20 days a year at or above 95°F, and the hottest day in the record came on July 14, 2024. Lawn irrigation and cooling push demand to its yearly high, so pumps run hard, tanks drain faster than they refill and pressure sags on high ground in the evening.
• Storm-driven power loss. Thunderstorm wind, hail and tornado reports in Hamilton County number 167 since 2015. Pump stations and treatment plants that depend on EPB run on the electric grid, so a storm that downs power lines can lower water pressure even when no pipe is damaged.
• Construction and third-party damage. A backhoe or boring crew that hits a main is among the most common reasons a single block goes dry without warning. Utilities handle those the same way as any break: isolate, repair, flush.

How weather strains the Chattanooga water system

Main break season in Chattanooga runs from late fall into early spring, with the coldest stretch around December through February.

The figures are reanalysis estimates for the center of Chattanooga, not readings from a single weather station, so treat them as a guide to how often each kind of weather occurs rather than as official records.

Boil water advisories and the federal violation record for Chattanooga

Since 2015, EPA's record for Tennessee American Water shows no health-based violations.

When Chattanooga loses pressure after a break or a failed test, Tennessee American Water asks affected customers to boil water for drinking and cooking. The notice ends only after samples come back clean, which usually takes one to two days after service returns, and the Tennessee Department of Environment and Conservation (TDEC) supervises the process.

Lead, older pipes and water quality in Chattanooga

The most recent 90th-percentile lead result filed for Tennessee American Water is 1 ppb (2025). The federal action level is 15 ppb, so that result is comfortably below it.

42.4% of occupied homes in Chattanooga were built before 1970, and lead service lines and solder stayed legal until the federal ban in 1986. After any outage that disturbs the pipes, run the cold tap 30 seconds to 2 minutes before drinking, and ask Tennessee American Water about its lead service line inventory.

Restoration times for water outages in Chattanooga

A crew that arrives at an ordinary main break in Chattanooga usually needs 4 to 8 hours to isolate the pipe, dig, repair, flush and restore pressure. Large transmission mains, deep pipes and breaks under busy streets can take a day or more.

Ask Tennessee American Water for a restoration estimate when you report the outage; for large breaks it is normally posted and updated as the repair progresses.

How much water to keep on hand in Chattanooga

With about 2.3 people in the typical Chattanooga home, FEMA's one-gallon-per-person-per-day rule means 7 gallons covers three days and 33 gallons covers two weeks.

• A standard water heater is a ready-made 40-gallon reserve. Shut off its power or gas, open a hot tap somewhere in the house, and draw from the drain valve.
• Fill a tub or large containers early for toilets, cleaning and handwashing, and store drinking water separately in clean bottles.

How Chattanooga compares with nearby water systems

Water outage pages for nearby cities

Huntsville, AL · Roswell, GA · Sandy Springs, GA · Johns Creek, GA