A boil-water notice changes how you use hot water, too

A water advisory lands at the worst possible time: breakfast, baths, dishes, and laundry are already in motion. The useful first question is not "Should I drain the heater?" It is "What kind of advisory did the utility issue?" A boil-water notice, a do-not-drink notice, and a do-not-use notice call for very different household decisions.

Three notices that sound similar but are not

During a boil-water advisory

CDC guidance says not to drink or use water or ice from appliances connected to the water line during a drinking-water advisory. That includes refrigerator dispensers. For a boil-water notice, use bottled water or water boiled according to the official notice for drinking, brushing teeth, making ice, preparing food, infant formula, and pet water.

The CDC's standard instruction is a full rolling boil for one minute, or three minutes at elevations above 6,500 feet. Your local notice controls. Wasatch Front addresses vary in elevation, and a mountain property may sit much higher than a nearby valley address, so do not guess from the city name.

Bathing and handwashing rules can vary with the event and the people in the home. Young children are more likely to swallow bathwater. Follow the local notice and use extra caution rather than assuming hot water is safe because it came through a heater.

Do not turn the heater into a treatment system

A residential heater holds water at a set temperature, cycles on and off, and sends water through household plumbing. It does not certify that every gallon has reached the temperature and contact time needed to make contaminated water safe. Sediment, plumbing branches, mixing valves, and fixture aerators add more places where water can remain.

Do not raise the thermostat, operate a relief valve, drain a hot tank, open electrical covers, alter gas controls, or run a homemade disinfection procedure. Those steps can create scald, pressure, electrical, gas, and water-damage risks without resolving the advisory.

What to record while the notice is active

• the advisory type and a link or screenshot from the serving utility
• the affected address, start time, and latest update
• whether the home lost pressure or water service
• whether cloudy, discolored, or unusually odorous water appeared before the notice
• the water heater brand, model, fuel, and whether it is tank or tankless

A loss of pressure matters because the utility may give special flushing or return-to-service instructions. If only hot water looks or smells different after the cold side clears, save a sample photo and compare several fixtures before requesting water-heater help.

After officials lift the advisory

1. Read the all-clear all the way through. Look for instructions about household pipes, water heaters, softeners, filters, refrigerators, ice makers, and other connected appliances.
2. Follow the stated flushing order and duration. Do not assume that a generic five-minute flush fits every utility event.
3. Use cold water where the utility directs. Do not send unnecessary hot water through the heater while clearing the incoming plumbing.
4. Replace or sanitize filters only as directed. Check the appliance or filter manufacturer's instructions too.
5. Watch the first hot-water use. Note persistent discoloration, particles, odor, sputtering, leakage, or an error code.

If the utility specifically tells customers to drain, flush, disinfect, or service a water heater, use the heater manufacturer's procedure and a qualified provider where gas, electricity, hot drainage, or unfamiliar valves are involved. An older drain valve can leak after it is disturbed, and a full tank can release many gallons of scalding water.

When the utility and the heater need separate calls

Call the serving utility when cold and hot water share the same discoloration, odor, pressure loss, or advisory concern. Ask whether your address is affected and whether the system has issued appliance-specific flushing directions.

Request water-heater service when cold water has cleared but hot water alone remains rusty, cloudy, odorous, or full of particles; the heater displays an error; a valve starts leaking; or the tank does not return to normal operation. The rusty hot-water guide and clear-glass comparison test can help document what you see without opening the unit.

Sources and local alert starting points

• CDC: Drinking Water Advisories overview defines boil-water, do-not-drink, and do-not-use notices and explains common household precautions.
• U.S. EPA: Emergency disinfection of drinking water explains why suspected chemical or fuel contamination requires different treatment from germ contamination.
• Salt Lake City Department of Public Utilities posts utility notices and contact information for customers in its service area. Other Utah addresses should check the utility named on the water bill.