Diamond Bar, CA · Updated Oct 2026

What a Diamond Bar house pays

Property tax, water, trash and energy from public rates. Look up your address to make it yours, and see how to pay less.

Sent only to free public map services to find who serves it. Not stored unless you save your house.

Example · a Diamond Bar house

$14,432a year · $1,203 a month

Starts at $620,444 of value before exemptions. Typical use.

Property tax$7,201
1.174% of $620,444, less $7,000 homeowners' exemption
Flat charges on the tax bill$556
Sewer $303 · LA County Measure W Safe Clean Water tax (median single-family parcel) $109 · LA County Fire Measure E special tax (estimate, median-size home) $125 · San Gabriel Valley Mosquito and Vector Control assessment $20
Electricity and gas$3,505
523 kWh a month $2,637 · 35 therms $869
Water$1,233
13.21 units (CCF) a month on Walnut Valley Water District: water $103 a month
Trash$446
64-gallon refuse cart, $37 a month
Home insurance$1,492
Typical premium $1,492

A typical Diamond Bar house pays about $14,400 a year: $7,760 property tax and charges, $1,230 water, $450 trash, $3,510 electricity and gas, $1,490 home insurance. Estimated from public rates, not anyone's actual bill.

Rates checked Oct 22, 2026. Insurance: what you enter, or a typical premium until you do. Sources are listed at the bottom.

Ways to pay less

Nothing here applies to every house automatically. These are worth checking:

Switch to the 35-gallon refuse cart cartUp to $69 a year
Your cart costs $37 a month; the smallest costs $31. Worth it if you rarely fill it.
How: Call Valley Vista Services customer service at (800) 442-6454 or (626) 855-5501.
Seniors 60+ or disabled: discounted trash rate96-gallon cart: $33.69 a month instead of $42.12
Residents eligible for the senior discount must be 60 years of age or older, listed on the VVS account, and reside at the service address; customers verified as disabled through a valid DMV-issued handicap certification get the senior rates.
How: Use the Senior Discount Form or the Disability Discount Form on the City's refuse page.
Free bulky item and e-waste pickups
VVS provides four free pickups of up to four items per pick up per year; pickups must be scheduled 48 hours before your regular service day.
How: Valley Vista Services customer service: (800) 442-6454.
Free door-to-door household hazardous waste pickups
Residential customers are entitled to two free door-to-door HHW pickups per calendar year.
How: Valley Vista Services customer service: (800) 442-6454.
Low-income seniors over 62: Safe, Clean Water parcel tax exemptionNo Safe, Clean Water tax
Owners over 62 who live in the home and head a low-income household can apply for an exemption from the Safe, Clean Water Program special parcel tax; the FY 2027-28 limit is $106,600 for a 2-person household.
How: Submit the claim form to the Safe, Clean Water Program by May 1 each year; call 833-275-7297.

Adjust to match your bills

What you knowTrash cartBasic service fee from July 1, 2026; the 64-gallon refuse cart comes with a 64-gallon recycling cart and a 64-gallon organics cart.

Value before exemptionsUnder Prop 13 your assessed value starts at your purchase price and can rise at most 2% a year, so it is often far below market: use the assessed value on your tax bill. About 38% of Diamond Bar's single-family parcels are in Pomona Unified, whose bonds make the school rate different (not priced here).

I live here and have the Homeowners' exemption

Home insurance, a yearFrom your policy. We start at $1,492, NAIC data via the Insurance Information Institute; California figures from the California Department of Insurance.

Earthquake insurance, a yearSeparate from home insurance. Most owners don't have it.

Your use

Water, units a month

On your water bill. 1 unit (CCF) is 748 gallons. A typical Diamond Bar house uses about 13.21.

Electricity, kWh a month

On your Southern California Edison bill. An electric car adds about 300 kWh.

Gas, therms a month (yearly average)

Money dates

Nov 30, 2026in 38 daysLast day to file a 2026 regular assessment appeal in LA County (filing runs July 2 to November 30).
Dec 10in 48 daysFirst property tax installment (due Nov 1) is late after Dec 10: 10% penalty.
Feb 15in 115 daysLast day for a first-time homeowners' exemption claim to get the full exemption for the year.
Apr 10Second property tax installment (due Feb 1) is late after Apr 10: 10% penalty plus $10.

Who serves this house

Water: Walnut Valley Water District; Walnut Valley Water District, single-family rates effective January 1, 2026: a monthly base rate by meter size plus three tiers per unit (1 unit = 748 gallons); homes in pumping zones 2 and 3 pay $0.30 or $0.55 more per unit.
Property tax: 1.17% of value; 2026-27 tax year, Los Angeles County
Garbage: Valley Vista Services; Valley Vista Services has been Diamond Bar's residential waste and recycling provider since Sept. 1, 2025.
Sewer: LA County Sanitation District No. 21; County Sanitation District No. 21 encompasses all or portions of Diamond Bar and collects its charge on the property tax roll.
Electricity: Southern California Edison; The City's emergency-contacts page lists Southern California Edison under utilities.
Gas: SoCalGas; Southern California Gas Company serves natural gas in Diamond Bar.

Pay or manage your bills

Your water

Source: Walnut Valley Water District imports 100% of its drinking water through Three Valleys Municipal Water District and the Metropolitan Water District: about 60% from MWD's Weymouth plant, 39% from TVMWD's Miramar plant and 1% groundwater.
Hardness: Total hardness averaged 234 ppm in the water from MWD's Weymouth plant and 97 ppm in the water from TVMWD's Miramar plant.
Lead: In tap samples from 30 sites in 2024 the 90th-percentile lead result was 0 ppb and no site was above the action level; the District's 2024 service line inventory found no lead or galvanized service lines requiring replacement.

Other CA cities

How these numbers are made

Individual bills are confidential in California, so we calculate yours from public rates and what you tell us.
Property tax: the rate shared by the Walnut Valley Unified tax rate areas (about 62% of Diamond Bar's single-family parcels by school-district boundary; the rest are in Pomona Unified, which has different bond rates and is not priced here): the 1% levy plus the 2026-27 Walnut Valley Unified, Mt. San Antonio College and Metropolitan Water District rates from the LA County tax rate resolution (1.17381% in total, the same bond rates Walnut's Walnut Valley Unified areas pay), less the $7,000 homeowners' exemption, applied to the value you enter. Diamond Bar levies no city property tax rate of its own. The starting value is the median 2026 roll value of single-family parcels; Prop 13 values of long-held homes are far below market.
Sewer and flat charges on the tax bill for 2026-27: County Sanitation District No. 21's $224 service charge and the County Consolidated Sewer Maintenance District's $78.50 per sewage unit; Measure W at the median for Diamond Bar single-family parcels in the county's Safe Clean Water tax layer ($108.69); LA County Fire's Measure E special tax (6 cents per square foot of buildings plus the 2% yearly adjustment, on the median 2,037 sq ft single-family home in the County parcel file: about $124.66); the San Gabriel Valley Mosquito and Vector Control District's $20 per parcel. Not included, because we could not source whether they apply to Diamond Bar parcels or because they vary by parcel: city landscape or lighting assessments, the Metropolitan Water District standby charge, the LA County flood control assessment, the trauma and emergency services tax and the park district assessment (Measure A).
Trash: Valley Vista Services' basic service fee from July 1, 2026 (64-gallon refuse cart $111.48 a quarter, $37.16 a month, the default here), billed by Valley Vista, not on the tax bill. The fee depends on the refuse cart size.
Water: Walnut Valley Water District, single-family rates effective January 1, 2026 ($41.98 a month for a 5/8- or 3/4-inch meter; $4.02 per unit up to 6 units, $5.08 for 7-27, $6.75 above, 1 unit = 748 gallons); homes in pumping zones 2 and 3 pay $0.30 or $0.55 more per unit, not included. The starting use, 13.2 units a month, is the District's 2024 rate study's projected single-family use for 2025 divided by its single-family bills a year. Other water systems that may serve a few Diamond Bar homes are not priced.
Electricity: SCE's standard Domestic rate with SCE generation from the SCE/CPA joint rate comparison ($0.37392 per kWh in total, SCE rates as of June 1, 2026; $195.56 average bill at 523 kWh equals that rate times the usage), plus SCE's $24.15 monthly Base Services Charge. Gas: SoCalGas's March 2026 average non-CARE bill ($72.39 at 35 therms), taken as including the $0.16-a-day customer charge, so $4.87 a month plus $1.929 per therm. Both are averages; real bills vary by season. Insurance starts at the 2022 California average, the latest official one we found; enter your own.
Nothing here is legal, tax or insurance advice.

Sources

How Diamond Bar compares

A typical Diamond Bar house against the 110 California cities we cover, using the same default numbers as the total above.

Per year	Diamond Bar	Median	Where it falls
Property tax rate	1.17%	1.13%	higher than 74 of the other 109 California cities we cover
Water	$1,233	$955	higher than 89 of the other 109 California cities we cover
Trash	$446	$438	higher than 53 of the other 101 California cities we cover
Electricity and gas	$3,505	$3,556	lower than 62 of the other 109 California cities we cover
Home insurance	$1,492	$1,492	in the middle of 108 other California cities we cover
Total	$14,432	$15,240	lower than 67 of the other 109 California cities we cover

Cities bill differently (some put trash on the tax bill, some cover more services), so a higher number isn't necessarily worse. The property tax rate is compared instead of dollars because house values differ.

Questions to ask your candidates

Each one starts from a number above. Any candidate can answer them.

1. Water

The fact: Water here costs about $1,233 a year at typical use, higher than 89 of the other 109 California cities we cover.

Ask: "Water here costs about $1,233 a year at typical use, higher than 89 of the other 109 California cities we cover. What drives that cost, and would you change anything?"

See who is running in your city →

Common questions about Diamond Bar house costs

What is the property tax rate in Diamond Bar?

About 1.17% of the value before exemptions a year (2026-27 tax year, Los Angeles County), plus flat charges on the same bill (Sewer $303, LA County Measure W Safe Clean Water tax (median single-family parcel) $109, LA County Fire Measure E special tax (estimate, median-size home) $125, San Gabriel Valley Mosquito and Vector Control assessment $20).

How much is property tax on a $500,000 house in Diamond Bar?

About $6,343 a year on $500,000 of the value before exemptions with the homeowners' exemption, including $556 of flat charges.

How much is the water bill in Diamond Bar?

About $103 a month for water at typical use (13.21 units, or 9,881 gallons a month) on Walnut Valley Water District.

How much does trash pickup cost in Diamond Bar?

$31 to $42 a month, depending on the trash cart size (35-gallon refuse cart, 64-gallon refuse cart, 96-gallon refuse cart).

When is property tax due in Diamond Bar?

Dec 10: First property tax installment (due Nov 1) is late after Dec 10: 10% penalty. Apr 10: Second property tax installment (due Feb 1) is late after Apr 10: 10% penalty plus $10.

Can seniors lower their property tax or bills in Diamond Bar?

Yes. Seniors 60+ or disabled: discounted trash rate: Residents eligible for the senior discount must be 60 years of age or older, listed on the VVS account, and reside at the service address; customers verified as disabled through a valid DMV-issued handicap certification get the senior rates.

Where can I get help paying utility bills in Diamond Bar?

Low-income seniors over 62: Safe, Clean Water parcel tax exemption: Owners over 62 who live in the home and head a low-income household can apply for an exemption from the Safe, Clean Water Program special parcel tax; the FY 2027-28 limit is $106,600 for a 2-person household. Submit the claim form to the Safe, Clean Water Program by May 1 each year; call 833-275-7297.

How much does a house in Diamond Bar cost to run each year?

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