Eastern Oklahoma — humid, wooded, and carrying the state’s heaviest subterranean termite and moisture pressure. County seat is Bartlesville.

Washington County housing profile

Housing units	19,537
Built before 1980	69%
Built before 1940	10%
Built since 2000	14%
Utility gas heat	70%
Electric heat	26%
Bottled or tank propane	2.5%

Source: U.S. Census American Community Survey, tables B25034 and B25040, aggregated from place-level data for the 6 municipalities we hold data for in this county.

What that means for moisture and mold

Older stock here means uninsulated crawlspaces, plaster that holds moisture long after a leak is fixed, and bathrooms that were built without exhaust fans. Bare crawlspace soil evaporates upward continuously, and sealing it with a vapor barrier is the highest-return moisture fix available on a house of this age.

At 2.5% propane heat, this county has a meaningful share of households off the gas main — which usually also means private wells and septic systems rather than municipal service.

Water systems in this county

Oklahoma has 847 active community water systems across all 77 counties. Of those, 317 carry a violation or an open enforcement priority — roughly 37% statewide. That figure comes from the EPA ECHO compliance export.

[COUNTY-LEVEL SYSTEM DATA PENDING — the per-county ECHO extract will replace this paragraph with the named systems serving Washington County and their current compliance status.]

Towns and communities in this county

Bartlesville, Dewey, Ochelata, Ramona, Copan, Vera.

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Written by Jaylan Jones. Sooner Mold Remediation earns a referral fee when a call connects to a contractor. See our business-model disclosure.