How much does an electric water heater cost per month in California?

About $101 a month, assuming 3,500 kWh a year at 34.74¢/kWh.

How many kilowatt-hours does an electric water heater use?

Roughly 3,500 kWh a year under these assumptions.

Is that expensive compared with other states?

California has the 2nd most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $642 a year.

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Cost to run an electric water heater in California (June 2026 rates)

At 34.74¢ per kilowatt-hour — California's average residential price in June 2026 — running an electric water heater costs $1,216 a year. That is 89% more than the national average of $642. California's residential rate is up 3.4% from June 2025, which moves this appliance from $1,176 to $1,216 a year.

Per day: $3.33
Per month: $101
Per year: $1,216

Assumption: 3,500 kWh a year. A 50-gallon resistance tank for a household of three or four. This is typically the largest or second-largest electric load in a home without electric heat. Use the calculator to swap in the numbers from your own model.

How California compares

California pays 34.74¢/kWh, the 2nd most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $574 more a year than the typical U.S. household pays for the same use. Running the same electric water heater costs $459 a year in Nevada and $1,845 in Hawaii, so where you live changes this bill by $1,386 a year.

State	Rate	Per month	Per year
New York	29.49¢	$86.01	$1,032
Maine	29.59¢	$86.30	$1,036
Massachusetts	29.61¢	$86.36	$1,036
California	34.74¢	$101	$1,216
Hawaii	52.72¢	$154	$1,845

States ranked by average residential price, cheapest first. See all 51 states for an electric water heater.

What else costs about the same in California

Electric car$1,320 a year in CA Hot tub$869 a year in CA Central air conditioner$817 a year in CA

Cutting the number down

A heat-pump water heater does the same job for roughly a third of the electricity, which is why it usually pays back faster than any other upgrade in the house.
Dropping the setpoint from 140 F to 120 F cuts standby losses and scalding risk at once.
An insulating blanket on an older tank pays for itself in a season; check the manufacturer's guidance first.

Questions

How much does an electric water heater cost per month in California?: About $101 a month, assuming 3,500 kWh a year at 34.74¢/kWh.
How many kilowatt-hours does an electric water heater use?: Roughly 3,500 kWh a year under these assumptions.
Is that expensive compared with other states?: California has the 2nd most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $642 a year.