Scottsdale, Arizona Water Outage Today

Who runs the water in Scottsdale: system profile

The system behind most taps in Scottsdale is City of Scottsdale, which EPA records list as serving roughly 241,361 people. Customers know it as Scottsdale Water; the name on your bill is the one to call.

Source water and treatment in Scottsdale

Tap water in Scottsdale starts as surface water. City of Scottsdale takes it from rivers, lakes or reservoirs and runs it through treatment before it reaches the mains. 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.

The outage angle. Because the water is drawn from open surface sources, it has to be filtered and disinfected continuously. A plant problem therefore hits everyone at once, unlike a main break, which only dries up the blocks on either side of the damaged pipe. EPA lists 1 emergency connection to neighboring systems, which can be opened to move water across a boundary during a failure.

Why the water goes out in Scottsdale

These are the causes that match the record for Scottsdale, listed roughly in order of how much they matter here.

• Flooding and heavy rain. NOAA logged 560 flood, flash flood and heavy rain reports in Maricopa County from 2015 through 2026. High water can wash out the ground under buried pipe, flood pump stations and push treatment plants past their limits, which is why boil notices so often follow a flood.
• Summer demand. Scottsdale has about 139 days a year at or above 95°F and 104 at or above 100°F, and the hottest day in the record came on June 20, 2017. 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 Maricopa County number 852 since 2015. Pump stations and treatment plants that depend on Arizona Public Service (APS) run on the electric grid, so a storm that downs power lines can lower water pressure even when no pipe is damaged.
• Long dry spells. The longest stretch without measurable rain since 2015 lasted 98 days, ending December 16, 2017. Dry soil shrinks and shifts around buried pipe, and breaks often cluster when the rain returns and the ground swells again.
• Younger pipe, different risks. Only 15.2% of occupied homes in Scottsdale predate 1970 (US 35.5%), so more of the network is newer plastic or ductile iron. Breaks tend to come from construction damage, pressure surges and weather rather than age.
• Digging and utility work. Street projects, fiber installation and excavation near buried pipe regularly cut mains in Scottsdale with no warning, usually on a day with perfectly ordinary weather.

Scottsdale weather and water-main stress, 2015–2025

Heat, not frost, is the main weather stress on the water system in Scottsdale: summer demand peaks while irrigation and cooling run at full tilt.

These counts come from a gridded reanalysis, which smooths out single-day extremes and can differ by a few degrees from an airport thermometer. Use them to compare seasons and years, not as official station records.

Boil water advisories and the federal violation record for Scottsdale

Since 2015, EPA's record for City of Scottsdale shows no health-based violations. It also lists 18 monitoring or reporting entries that are about paperwork rather than water quality, such as a missed sample or a late report.

Most recent entries, all monitoring or reporting:

• March 2025: A missed or late disinfection byproduct monitoring sample It is marked resolved.
• January 2025: A missed or late monitoring or reporting requirement (chemical and radiological contaminants)

Boil water notices in Scottsdale are precautions, not findings. When pressure drops, Scottsdale Water tells affected customers to boil water until two rounds of lab tests are clean, a process that normally takes 24 to 48 hours after service is restored, under oversight from the Arizona Department of Environmental Quality (ADEQ).

Lead, older pipes and water quality in Scottsdale

The most recent 90th-percentile lead result filed for City of Scottsdale is 2.3 ppb (2023). The federal action level is 15 ppb, so that result is comfortably below it.

15.2% of occupied homes in Scottsdale 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 Scottsdale Water about its lead service line inventory.

When will the water come back on in Scottsdale?

Most repairs of an ordinary main break in Scottsdale take half a day once the crew is on site. Bigger mains, deep bury and busy roads stretch that to a day or more.

Scottsdale Water will post an estimated restoration time for a break that affects many customers; ask for the repair crew's estimate when you call.

Preparing for a long water outage in Scottsdale

Census figures put the typical Scottsdale household at about 2.1 people. At one gallon per person per day that is 6 gallons for three days or 29 gallons for a two-week supply.

• Heat: 139 days a year top 95°F here, so plan for more than the one-gallon minimum, and keep extra for pets.
• 26.4% of residents are 65 or older (US 17.2%); older adults dehydrate faster and may need help moving heavy water jugs.
• 18.1% of homes are in buildings with 20 or more units. Upper floors lose pressure first, and rooftop tanks and booster pumps depend on building power.
• Your water heater tank holds 30 to 50 gallons of clean water. Turn off the power or gas to it first, then drain from the valve at the bottom.
• If a planned shutoff or storm is coming, fill the tub and some buckets for flushing toilets and washing; keep drinking water in clean sealed containers.

Water systems near Scottsdale, side by side

Water outage pages for nearby cities

Tempe, AZ · Mesa, AZ · Phoenix, AZ · Tucson, AZ