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History of 'Metro'King County residents voted in 1958 to build and operate a regional agency called the Municipality of Metropolitan Seattle, or Metro, to clean polluted waters of Lake Washington and Puget Sound. Since then, we have helped prevent water pollution and improve water quality while recycling natural resources. No longer called Metro, the wastewater utility is now a division in King County's Department of Natural Resources and Parks (DNRP). |
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Facts about the King County Regional Wastewater System
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System |
West Point |
South |
Vashon |
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| 34 local agencies (includes 17 cities, 16 sewer districts, and the Muckleshoot Indian Tribe) |
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1 sewer district |
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Population served |
1.4 million residents |
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650 |
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420 square miles |
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620 acres |
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Sewage Treated, back to top |
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| System |
West Point |
South |
Vashon |
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Sewage treated (volume) |
About 178 million gallons a day (average) |
98.1 mgd |
79.8 mgd |
0.14 mgd |
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Sewage treated (average based on 1996-2000) |
200.7 mgd |
119.3 mgd |
81.3 mgd |
0.124 mgd |
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Septage treated |
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15.1 million gallons |
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Facilities and Equipment, back to top |
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System |
West Point |
South |
Vashon |
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Treatment plants |
3 |
West Point Treatment Plant, |
South Treatment Plant, |
Vashon Treatment Plant, |
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Treatment plants in construction |
2: |
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Pump stations |
42 |
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4 |
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Regulator stations |
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19 |
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CSO treatment facilities |
4: |
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King County sewer conveyance lines |
about 353 miles |
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3.2 miles |
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Sewer pipe diameter |
12 inches to 14 feet |
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2 feet 5 inches HDPE |
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Outfalls, length and depth |
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3,600 ft long; |
10,000 ft long; |
2,850 ft long; |
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Design Criteria, back to top These figures are engineering design parameters that show average and maximum wastewater loads the treatment plants are designed to handle. |
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West Point |
South |
Vashon |
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Average wet-weather flow (non-storm): This number is often used to describe the size of the treatment plants. It is based on average wet-season flow (November through April) but does not include extraordinarily large storms in the average. It is based on an average that does not show the maximum flows that can be handled at a plant. |
133 mgd |
115 mgd |
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Maximum monthly average flow |
215 mgd |
144 mgd |
0.52 mgd |
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Average dry-weather flow |
110 mgd |
96 mgd |
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Biological oxygen demand (BOD) influent loading |
168,000 lbs/day |
220,000 lbs/day |
526 lbs/day |
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Total suspended solids (TSS) influent loading |
181,000 lbs/day |
201,000 lbs/day |
526 lbs/day |
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Instantaneous maximum capacity: |
440 mgd |
325 mgd |
2.05 mgd |
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Resource Recovery, back to top |
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System |
West Point |
South |
Vashon |
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Electricity produced annually |
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0.8 million kilowatt hours |
~4.3 million kilowatt hours |
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Methane gas sold annually |
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1.59 million therms |
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Biosolids produced annually |
About 108,003 wet tons |
46,420 wet tons (or 12,411 dry tons @ 26.7% dryness) |
61,584 wet tons (or 14,089 dry tons @ 22.9% dryness) |
32 dry tons hauled to South Plant for further treatment |
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Reclaimed water used |
About 293 million gallons used for landscape irrigation, industrial processes, heating/cooling |
195 million gallons |
98.4 million gallons |
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Permit Information, back to top |
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System |
West Point |
South |
Vashon |
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Permit (NPDES) renewal dates View permit limits (BOD, TSS, fecal coliform, chlorine residual) for each treatment plant. |
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1/1/09 |
10/1/09 |
9/1/11 |
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Financial and Budget Information, back to top |
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$27.95 per month (beginning 1/1/07) |
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$46.25 per month ($138.75 every three months) |
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Operating: $100 million |
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Number of employees |
About 598.7 full-time equivalents (FTEs) and |
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Brightwater Treatment Plant estimates |
Cost: $1.767 billion (with inflation) |
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WTD expenditures for capital facilities through 2030 |
$3.5 billion (2008 dollars) |
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Other, back to top |
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Total rainfall |
Total rainfall 2007, 44.77 inches; |
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Significant industrial users |
128 |
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Industrial/commercial facilities with discharge authorizations |
310 |
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Approximate number of compliance samples taken |
2,279 |
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Inspections conducted |
397 |
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Combined Sewer Overflows (CSOs) |
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Baseline volume (1980-83) |
2.3 billion gallons per year |
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Current volume (June 2006-May 2007) |
691 million gallons per year |
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Number of King County CSOs |
38; (view map for overflow locations and status) |
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Return to:
Wastewater Treatment Division Home
South Treatment Plant
West Point Treatment Plant
Vashon Treatment Plant
King County Wastewater (NPDES) Permits
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Department of Natural Resources and Parks Updated: April 8, 2008 |
Related Information: Annual Summaries - Biosolids Quality and Program Industrial Pretreatment Quarterly newsletter
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King County | Natural Resources & Parks | Wastewater Treatment Division Links to external sites do not constitute endorsements by King County. |
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