Monmouth, OR · Updated Oct 2026

What a Monmouth home costs each year

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

Suggestions as you type come from Google; the lookup uses free public map services to find who serves it. Not stored unless you save your house.

Example · a Monmouth house

$7,668a year · $639 a month

Starts at $211,213 of value before exemptions. Typical use.

A typical Monmouth house costs about $7,700 a year: $3,620 property tax and charges, $1,450 water and sewer, $470 trash, $1,240 electricity, $890 home insurance. Estimated from public rates, not anyone's actual bill.

Rates checked Oct 29, 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 cart, weekly cartUp to $112 a year
Your cart costs $39 a month; the smallest costs $30. Worth it if you rarely fill it.
How: Brandt's Sanitary: 503-838-0464 (a fee applies to cart size exchanges).
Pay the property tax in full by November 153% off
Paying in full by November 15 takes 3% off; paying two-thirds by November 15 takes 2% off that payment. Paying in three installments gets no discount.
How: Pay Polk County online, by phone, by mail, or in person at the Tax Office or the drop box in the Courthouse parking lot (fees apply for some methods).
Seniors and disabled homeowners: property tax deferral
If you qualify, the Oregon Department of Revenue pays your county property taxes on November 15 each year. A lien is placed on the property and deferral accounts accrue 6 percent interest yearly. The household income limit for 2026 is $70,000.
How: Apply with the Polk County Assessor by April 15, or late from April 16 to December 1 with a fee; call 503-623-8391.
Disabled veterans and surviving spouses: property tax exemption$27,092 or $32,512 off assessed value
Veterans with disabilities of 40 percent or more, and qualifying surviving spouses or partners, may exempt $27,092 or $32,512 of their homestead's assessed value. The amount increases by 3 percent each year.
How: File with the Polk County Assessor between January 1 and April 1; call 503-623-8391.

Adjust to match your bills

What you knowTrash cartBrandt's Sanitary's posted city rates plus its $1.90 recycling surcharge; check your Brandt's bill.

Value before exemptionsOregon taxes assessed value, which is usually well below what the house would sell for. Your tax statement shows your assessed value.

Home insurance, a yearFrom your policy. We start at $886, Oregon statewide average for 2023, NAIC data in the Oregon Insurance Commissioner's January 2025 legislative briefing.

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 house uses 7–12.

Electricity, kWh a month

On your Monmouth Power & Light bill. An electric car adds about 300 kWh.

Money dates

Nov 15in 11 daysLast day for the property tax discount: pay in full for 3% off, or pay 2/3 for 2% off that payment
Dec 31in 57 daysLast day to file a Property Value Appeals Board (PVAB) appeal of your property value (next business day if December 31 falls on a weekend or holiday)
Apr 1Last day to file for property tax exemptions, including the disabled veteran / surviving spouse exemption
Apr 15Senior and disabled property tax deferral applications due to the county assessor (late filing April 16 to December 1 with a fee)

Who serves this house

Water: City of Monmouth; City of Monmouth monthly water charges effective 6/15/2025: $25.02 basic fee for a ¾″ meter (most residential) plus $0.036 per cubic foot of water
Property tax: 1.71% of value; 2025-26 tax year, Polk County code area 1301 (City of Monmouth, Central SD 13J)
Garbage: Brandt's Sanitary; City rates on the Brandt's Sanitary price list
Sewer: City of Monmouth; Sewer based on winter water use, with a minimum monthly fee
Electricity: Monmouth Power & Light; City-owned electric utility, Residential Rate Schedule No. 1

Pay or manage your bills

How these numbers are made

Property tax: 2025-26 Polk County billing rates for code area 1301 (City of Monmouth, Central SD 13J), $17.1230 per $1,000 of assessed value; Oregon has no homestead exemption. The 2026-27 tables were not yet posted.
The starting assessed value ($211,213) is our estimate: Monmouth's Census median home value ($413,200) times code area 1301's real property assessed value divided by its Measure 5 value on the 2025-26 roll ($483,400,002 / $945,711,582, about 0.51), because the county publishes no median assessed value for Monmouth homes.
Water: City of Monmouth basic fee $25.02 plus $0.036 per cubic foot (= $3.60 per ccf), effective 6/15/2025. Sewer: the $38.57 minimum (the city bills winter water use at $0.0487 per cubic foot or the minimum). Stormwater $14.85. The City's rates page is the 2025 version; we could not confirm whether water, sewer or stormwater rates changed in June 2026.
Electricity: Monmouth Power & Light (City-owned) Schedule 1 effective June 15, 2026. 900 kWh a month is Pacific Power's Oregon residential average, used as a stand-in. The $10.25 public safety fee appears on electric bills per the Polk County Itemizer-Observer and was to rise 3% a year; the City's own page does not state the amount, so the later escalation is not counted.
Not included: natural gas (we could not confirm which gas utility serves Monmouth homes), franchise fees, and system development charges. Insurance: the 2023 Oregon statewide average homeowners premium.
Nothing here is legal, tax or insurance advice.

Sources

How Monmouth compares

A typical Monmouth house against the 40 Oregon cities we cover, using the same default numbers as the total above.

Per year	Monmouth	Median	Where it falls
Property tax rate	1.71%	1.85%	lower than 27 of the other 39 Oregon cities we cover
Water	$689	$626	higher than 25 of the other 39 Oregon cities we cover
Sewer and utility-bill fees	$764	$1,088	lower than 36 of the other 39 Oregon cities we cover
Trash	$469	$418	higher than 25 of the other 37 Oregon cities we cover
Electricity and gas	$1,244	$2,903	lower than 39 of the other 39 Oregon cities we cover
Home insurance	$886	$886	in the middle of 39 other Oregon cities we cover
Total	$7,668	$10,514	lower than 38 of the other 39 Oregon 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. Sewer and utility-bill fees

The fact: Sewer and flat utility-bill charges here come to about $764 a year, lower than 36 of the other 39 Oregon cities we cover. Some cities bill sewer on the property tax bill instead, which is not counted here.

Ask: "Sewer and flat utility-bill charges here cost about $764 a year, lower than 36 of the other 39 Oregon cities we cover. What drives that cost, and would you change anything?"

2. Electricity and gas

The fact: Electricity and gas for a typical house here cost about $1,244 a year, lower than 39 of the other 39 Oregon cities we cover. Rates are set mostly by the utility and the state.

Ask: "Electricity and gas here cost about $1,244 a year for a typical house, lower than 39 of the other 39 Oregon cities we cover. Which parts of that can the city influence, and what would you do about them?"

See who is running in your city →

Common questions about Monmouth house costs

What is the property tax rate in Monmouth?

About 1.71% of the value before exemptions a year (2025-26 tax year, Polk County code area 1301 (City of Monmouth, Central SD 13J)), plus flat charges on the same bill.

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

About $8,562 a year on $500,000 of the value before exemptions.

How much is the water bill in Monmouth?

About $121 a month for water and sewer at typical use (9 units, or 6,732 gallons a month) on City of Monmouth.

How much does trash pickup cost in Monmouth?

$30 to $49 a month, depending on the trash cart size (35-gallon cart, weekly, 65-gallon cart, weekly, 95-gallon cart, weekly).

When is property tax due in Monmouth?

Apr 15: Senior and disabled property tax deferral applications due to the county assessor (late filing April 16 to December 1 with a fee) May 15: Third trimester property tax payment due

Can seniors lower their property tax or bills in Monmouth?

Yes. Seniors and disabled homeowners: property tax deferral: If you qualify, the Oregon Department of Revenue pays your county property taxes on November 15 each year. A lien is placed on the property and deferral accounts accrue 6 percent interest yearly. The household income limit for 2026 is $70,000.

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

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