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Single Family ResidenceResidential
$418,055$330 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $260,000 on Jan 15, 2021

509 OASIS PL SW

MATTAWA, WA 99349
3
Beds
2
Baths
1,266 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.24 ac
Lot SizeThe size of the land the home sits on, from county records.
2006
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$418K
$396K low$440K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$260,000 · Jan 15, 2021

Tax & Assessment

Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$339,731 (2024)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$83,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$256,731
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$306,244
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$339,731

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.40
35
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
82
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
46
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
4
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
35
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.7 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyGrant
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.2014
Lot (acres)The size of the land the home sits on, from county records.0.23
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Concrete
HeatingThe type of heating system in the home.Heat Pump
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Saddle Mountain Elementary SchoolF
Elementary · Grades 1–3 · 4.3 mi
M
Wahluke Junior High SchoolF
Middle · Grades 6–8 · 4.4 mi
H
Wahluke High SchoolD
High · Grades 9–12 · 4.4 mi

District: Wahluke School District

Neighborhood · ZIP 99349These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.86
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.109
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.90

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.85%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.12%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.17%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.2.1%
PopulationHow many people live in this area.8,354
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.25 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$63,897
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$85,776
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.8 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

509 Oasis Pl Sw measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 65% of homes in Grant County
  • Costs more per square foot than 88% of homes in Grant County
  • Smaller than 68% of homes in Mattawa 99349
  • Newer than 80% of homes in Grant County

What homes are worth in Mattawa 99349

Each bar is how many homes fall in that price range. The marker is this home.

This home
$176K$1.1M

This home is worth more than 36% of homes in Mattawa 99349.

How it measures up in Mattawa 99349

The dot is this home. The mark in the middle is the typical home in Mattawa 99349.

Estimated value$418,055
CheaperTypical $498,881Pricier

Pricier than 36% of homes nearby

Price per ft²$330
CheaperTypical $332Pricier

Pricier than 49% of homes nearby

Living area1,266 ft²
SmallerTypical 1,440 ft²Bigger

Bigger than 32% of homes nearby

Lot size0.24 ac
SmallerTypical 0.24 acBigger

Bigger than 49% of homes nearby

Year built2006
OlderTypical 1998Newer

Newer than 76% of homes nearby

How 509 Oasis Pl Sw ranks against every home in each area.
MeasureThis homeMattawa 99349Grant County
Estimated valuepricier than$418,05536% of homes65% of homes
Price per ft²pricier than$33049% of homes88% of homes
Living areabigger than1,266 ft²32% of homes33% of homes
Lot sizebigger than0.24 ac49% of homes49% of homes
Year builtnewer than200676% of homes80% of homes

About 509 Oasis Pl Sw

How much is 509 Oasis Pl Sw, Mattawa, WA worth?

The TopHap Estimate for 509 Oasis Pl Sw, Mattawa, WA is $418,055 as of Sep 24, 2026. The likely range is $396,152 to $439,958. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 509 Oasis Pl Sw, Mattawa, WA last sell?

509 Oasis Pl Sw, Mattawa, WA last sold on Jan 15, 2021 for $260,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 509 Oasis Pl Sw, Mattawa, WA?

509 Oasis Pl Sw, Mattawa, WA has 3 bedrooms, 2 bathrooms, 1,266 square feet of living space and a 0.23-acre lot.

When was 509 Oasis Pl Sw, Mattawa, WA built?

509 Oasis Pl Sw, Mattawa, WA was built in 2006, making it 20 years old. The building has 1 story.

What schools serve 509 Oasis Pl Sw, Mattawa, WA?

509 Oasis Pl Sw, Mattawa, WA is assigned to Saddle Mountain Elementary School (elementary), rated F; Wahluke Junior High School (middle), rated F; Wahluke High School (high), rated D. All sit in Wahluke School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 509 Oasis Pl Sw, Mattawa, WA compare to other homes in Mattawa 99349?

Among the 1,994 homes in Mattawa 99349, it is worth more than 36% of them ($418,055 against a typical $498,881), its price per square foot is higher than 49% of them ($330 against a typical $332), it is bigger than 32% of them (1,266 ft² against a typical 1,440 ft²), its lot is bigger than 49% of them (0.24 ac against a typical 0.24 ac) and it is newer than 76% of them (2006 against a typical 1998). Measured against all of Grant County, it is worth more than 65% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

More homes on Oasis Pl Sw

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