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Lawn Health AI
Voluntary Guidanceβ€’Washington Region

Seattle Lawn Watering Rules & Schedule

Official irrigation schedule, municipal water waste penalties, and local agronomic guidelines for Seattle homeowners.

What the Rules Here Actually Are

Seattle has no assigned watering days to break. Seattle Public Utilities (SPU) publishes guidance rather than a schedule, so what constrains your lawn here is the climate and the water bill β€” not a citation.

Seasonal Irrigation Schedule

Recommended Practice
Summer Schedule (Critical Window)
Peak Heat

Summer dry season (July-August) requires 1 inch of water per week or letting turf go dormant. Water early morning.

Spring & Fall Schedule

Heavy natural rainfall sustains lawns from October through May.

Winter Schedule

No irrigation required during winter rains.

What Enforcement Actually Looks Like Here

Voluntary 'Saving Water Partnership' targets peak summer water reduction.

Seattle Soil & Microclimate Strategy

Glacial till over Alderwood hardpan causes summer runoff and winter waterlogging. Moss and European crane fly infestations are high.

Regional Guides for Seattle

Agronomic guides tailored for Washington turf grass and climate.