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The Municipality of Metropolitan Seattle (Metro) provides sewage treatment and area-wide collection services to local jurisdictions. Metro bills cities and sewer districts, which provide local collection services to customers. Each municipality assesses its own service rates. The monthly commercial/industrial rate for Seattle is $4.05/100 cu ft. Metro services cover roughly 680 square miles and over 1,200,000 residential and commercial customers. Intensive monitoring of sewer flow ensures adequate processing of sewage for all users in the county.
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