Los Angeles, California Water Outage Today

Los Angeles water system at a glance

Los Angeles Department of Water and Power is the water system EPA lists for Los Angeles, serving about 3,875,566 people. Customers know it as Los Angeles Department of Water and Power (LADWP); the name on your bill is the one to call.

Source water and treatment in Los Angeles

Los Angeles drinks surface water. Los Angeles Department of Water and Power draws it from the Encino Reservoir, Los Angeles Aqueduct 01, and Los Angeles Aqueduct 02 and treats it before it goes into the distribution system. Treatment points named in EPA's facility list include Encino Microfiltration Plant, Aqueduct Filtration Plant Effluent-Trted, and N. Hollywood Central Treatment Facility. After treatment the water is held in 99 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. 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. EPA lists 1 emergency connection to neighboring systems, which can be opened to move water across a boundary during a failure.

Main breaks and shutoffs in Los Angeles: the usual causes

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

• Long dry spells. The longest stretch without measurable rain since 2015 lasted 161 days, ending October 15, 2016. Dry soil shrinks and shifts around buried pipe, and breaks often cluster when the rain returns and the ground swells again.
• Flooding and heavy rain. NOAA logged 123 flood, flash flood and heavy rain reports in Los Angeles County from 2015 through 2026, and 5 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.
• Older neighborhoods and pipe. 56.7% of occupied homes in Los Angeles 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.
• Digging and utility work. Street projects, fiber installation and excavation near buried pipe regularly cut mains in Los Angeles with no warning, usually on a day with perfectly ordinary weather.
• One-address problems. A closed valve, a meter swap or a failed regulator can leave a single house dry. Compare notes with a neighbor first; if they have water too, start with your own plumbing.

Los Angeles weather and water-main stress, 2015–2025

Weather stress on the water system in Los Angeles is moderate: freezes and heat waves are limited, so breaks tend to follow age, ground movement and construction more than weather.

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 Los Angeles

EPA lists 2 health-based violations for Los Angeles Department of Water and Power since 2015. It also lists 2 monitoring or reporting entries that are about paperwork rather than water quality, such as a missed sample or a late report.

Most recent health-based entries:

• January 2018: A treatment technique violation under the surface water treatment rules It is marked resolved.
• January 2016: A treatment technique violation under the surface water treatment rules It is marked resolved.

When Los Angeles loses pressure after a break or a failed test, Los Angeles Department of Water and Power (LADWP) 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 State Water Resources Control Board, Division of Drinking Water supervises the process.

Lead service lines and old plumbing in Los Angeles

The most recent 90th-percentile lead result filed for Los Angeles Department of Water and Power is 3.9 ppb (2023). The federal action level is 15 ppb, so that result is well under it.

The age of the housing matters more than the utility's test average: 56.7% of occupied homes in Los Angeles predate 1970 and 1986 was the year lead pipe and solder were banned. Flush the cold tap after an outage and ask Los Angeles Department of Water and Power (LADWP) whether your service line is on its lead inventory.

How long a water outage lasts in Los Angeles

A crew that arrives at an ordinary main break in Los Angeles 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. With 3,875,566 people on the system, a break on a main that feeds a whole district can leave thousands of homes dry at once, and crews may close valves several blocks away to isolate it.

For a break that affects many customers, Los Angeles Department of Water and Power (LADWP) usually posts an estimated restoration time. When you call, ask the dispatcher what the crew has told them.

Emergency water storage for Los Angeles households

Census figures put the typical Los Angeles household at about 2.7 people. At one gallon per person per day that is 8 gallons for three days or 38 gallons for a two-week supply.

• 29.9% 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.
• 64% of households rent. Tell your landlord or property manager about a leak or outage right away, since the shutoff valve may be theirs.
• Do not forget the water heater: the tank holds roughly 30 to 50 gallons you can drink after it is switched off and allowed to cool.
• Fill the bathtub and a few large pots as soon as you hear a break is likely; that water is for flushing and washing, not drinking.

Water systems near Los Angeles, side by side

Water outage pages for nearby cities

Long Beach, CA · Anaheim, CA · Santa Ana, CA · Irvine, CA