Kitsap County, WA

ZIP 98311

In ZIP 98311, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Naval Base Kitsap At Keyport meets every EPA legal limit; 5 contaminants are above health goals, led by bromodichloromethane at 76× California’s Public Health Goal.
• Nearest Superfund site: Bremerton Gasworks, 2.1 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Puget Sound Coatings (35%), mostly chromium.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,384 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98311

• Superfund sites nearbyF
• Factories and industrial sitesC
• Oil and gas wellsA to C
• Parks and nature nearbyB to C
• Air qualityA to B
• Drinking water qualityC
• Pesticide useA to B
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsA

Based on 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

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