Northern California Service Areas

North Coast

Del Norte and Humboldt counties run along the far-northern coast, where marine fog and coastal moisture keep humidity elevated for much of the year.

• Del Norte County Crescent City · Smith River
• Humboldt County Eureka · Arcata · Fortuna

Mountains

Trinity and Siskiyou counties sit inland across the Klamath and Trinity mountain ranges, where seasonal rain and snowmelt bring moisture into crawl spaces and attics.

• Trinity County Weaverville · Hayfork
• Siskiyou County Yreka · Mount Shasta

Shasta Cascade

Shasta and Tehama counties cover the upper Sacramento Valley and Cascade foothills, where hot dry summers give way to a wet winter season.

• Shasta County Redding · Anderson
• Tehama County Red Bluff · Corning

Northeast

Lassen and Modoc counties, on the high desert plateau of the far northeast, see cold winters and heavier snow loads that can trap moisture in homes and outbuildings.

• Lassen County Susanville
• Modoc County Alturas