Environment & Sustainability | Environmentally Critical Areas
PROHIBITED LAND USES AND MATERIALS
Class 1 1- and 5-year WHPA
Class 2 10-year WHPA
Class 3 High Recharge Areas
Prohibited Land Uses and Materials (New Uses / Activities)
Hazardous liquid transmission pipelines
prohibited
allowed subject to compliance with federal and state standards
Mining, processing and reclamation of any type
prohibited
prohibited
reviewed under development permit
Processing, storage, and disposal of radioactive substances (except certain medical uses)
prohibited
prohibited
prohibited
Underground storage tanks (UST)
prohibited prohibited
prohibited
prohibited
UST with double walls, vault and monitor
allowed subject to compliance with federal and state standards
Above ground storage tanks for hazardous substances or hazardous waste with primary and secondary containment area and spill protection plan Wells for class B and private water systems, when located in a water service area
allowed subject to compliance with federal and state standards
prohibited
prohibited
allowed subject to compliance with federal and state standards
Golf courses
prohibited prohibited
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Land use activities that require the use of nitrates, phosphorus, pesticides, and other chemicals that have a potential to degrade groundwater and surface water quality when used inappropriately or in excess Closed loop geothermal/heat exchange wells used to recirculate a chemical heat transfer fluid other than potable water Closed loop geothermal/heat exchange wells used to recirculate potable water*
prohibited
**
prohibited
**
Open loop geothermal/heat exchange wells
prohibited
prohibited
Closed loop geothermal/heat exchange systems (surface)
allowed subject to compliance with federal and state standards**
**
Injection wells (storm water or reclaimed water)
prohibited prohibited prohibited prohibited
prohibited
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Cemeteries
**
Wrecking yards
prohibited prohibited
prohibited prohibited
Landfills with hazardous waste, municipal solid waste, or special waste
90 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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