Directions to King County's wastewater treatment facilities

King Street Center | South Treatment Plant | Waterworks Gardens | West Point Treatment Plant | Brightwater project office | Vashon Treatment Plant

King Street Center (division headquarters)

201 S. Jackson St.
Seattle WA 98104-3855
206-684-1280; fax 206-684-1741

5th floor -- Wastewater Treatment Division
View Map and Directions

South Treatment Plant and Waterworks Gardens

1200 Monster Road S.W.
Renton WA 98057
206-684-2400; fax 206-684-2448
View Map

Fall 2007 - the Administration Building is being demolished and rebuilt, with an expected completion in 2009. To find staff at the plant, view map.

From King Street Center (in Seattle's Pioneer Square) via southbound Interstate 5  
1. Go east on S. Jackson Street.
2. Turn right onto Fourth Avenue S.
3. Turn right onto I-90 entrance.
4. Take the I-5 South exit.
5. Take Exit 157: East Martin Luther King Junior Way (I-900).
6. Stay to the left off I-5 and follow MLK for approximately 1.5 miles.
7. At the second stop light turn right onto 68th Ave.
8. Follow this road for 1 mile, and turn right onto Monster Road SW
9. The entrance to the treatment plant is on the left just after the old train tracks at the bottom of the hill about a half of a mile from the turn onto Monster Rd.
10. Turn left at the entrance and follow to the parking area on your right. Follow the signs to the administration building and check in.

From northbound Interstate 5  
1. Take Exit 154 to I-405 North (Burien/Renton exit).
2. Move to right lane and proceed about 1/2 mile.
3. Take Exit 1 (West Valley Highway).
4. Turn left onto Interurban Avenue S.
5. At light, turn right onto S.W. Grady Way.
6. See South Plant entrance or Waterworks Gardens below.

From southbound Interstate 405  
1. Take Exit 1 (Tukwila/West Valley).
2. At light, turn right onto Interurban Avenue S.
3. At light, turn left onto S.W. Grady Way.
4. See South Plant entrance or Waterworks Gardens below.

From Highway 167/Rainier Avenue S
1. Turn left (west) onto SW Grady Way.
2. See South Plant entrance or Waterworks Gardens below.

From Sea-Tac Airport  
1. Go north on Highway 99.
2. Take the I-5/405 exit (on the right side).
3. Continue straight to I-405 North.
4. Take Exit 1 (Tukwila/West Valley).
5. At light, turn left onto Interurban Avenue S.
6. Turn right onto S.W. Grady Way.
7. See South Plant entrance or Waterworks Gardens below.

South Plant Entrance:

Main Entrance/Monster Rd
1. Continue on S.W. Grady Way and turn onto Longacres Drive S.W.
2. Turn right onto Jackson Place S.W./Monster Road S.W.
3. The Gate 1 entrance into the plant is on the right, just before the railroad tracks. Follow signs to the Administration Building and check in.

7th Ave/Dewatering Building Entrance
1. Continue on S.W. Grady Way and turn onto Oaksdale Ave.
2. Turn left onto 7th Ave.
3. Enter the gate 3 entrance.
4. Parking is to the right.

For Waterworks Gardens
Instead of turning into the plant main entrance, continue on Monster Road S.W., go around the corner and up the hill. As you come down the incline, Waterworks will be on the right, just before you get to "T" intersection at Oakdale Avenue S.W.

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West Point Treatment Plant

1400 Utah St. W.
Seattle WA 98199
206-263-3840; fax 206-263-3850
View Map

From King Street Center (in Seattle's Pioneer Square)
1. Go east on S. Jackson Street.
2. Turn right on Fourth Avenue S.
3. Turn right on S. Royal Brougham Way.
4. Turn right on Alaskan Way S.
5. Continue north to Elliott Avenue W., which becomes 15th Avenue W.
6. Take the West Emerson/Fisherman’s Terminal exit and continue west.
7. See West Point entrance below.

From northbound Interstate 5
1. Take W. Mercer Street exit and head west.
2. Turn right on Westlake Avenue N.
3. Continue on Westlake Avenue N., which becomes W. Nickerson Street.
4. Continue to W. Emerson Street.
5. See West Point entrance below.

From southbound Interstate 5  
1. Take Exit 173.
2. Turn right on N.E. Northgate Way, which becomes N. 105th Street.
3. Turn left on Holman Road N.W., which becomes 15th Avenue N.W.
4. Cross the Ballard Bridge.
5. Take the W. Emerson Street exit.
6. See West Point entrance below.

From Sea-Tac Airport  
1. Go west on Highway 518.
2. Take Highway 509 North exit.
3. Continue on Highway 509, which becomes Highway 99.
4. Take Western Avenue exit.
5. Continue north on Western Avenue, which becomes Elliott Avenue W., then becomes 15th Avenue W.
6. Take West Emerson/Fisherman’s Terminal exit and head west.
7. See West Point entrance below.

West Point entrance
1. Turn right onto Gilman Avenue W.
2. Continue on Gilman Avenue W., which becomes Government Way and leads to Discovery Park.
3. Continue up the hill into the park.
4. Take the second left at Utah Ave.
5. Drive past the Authorized Vehicles Only sign, through the military housing.
6. At the bottom of the hill, turn right.
7. Continue under the overpass to the Administration Building parking lot on the right.

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Brightwater project office

22505 State Route 9 SE
Woodinville, WA  98072-6010
Receptionist: 206-263-9465
View Map

Note: Visitors must check in at the Brightwater office front desk, and again at the Hoffman construction trailer when going into fenced construction areas on site.

From Interstate 405
1. From N or S I-405, take State Route 522 N. (Woodinville/Monroe freeway).
2. About 1 mile after the Woodinville exit, take the State Route 9 exit.
3. Turn left onto State Route 9 (Snohomish Woodinville Rd).
4. Turn right at 228th St. S.E. The road will then turn to the north.
5. Drive about 75 yards and you will see the Brightwater office on your right-hand side (former Stockpot Soup building), turn right just before building and then take an immediate left into the building parking lot. (Do not continue straight into the work area) The main office entry is at south-west corner of the building.

Please note: the road on the project site coming to our office is now part of an active construction site and road conditions can be rough. Use extreme caution and please yield to all construction equipment

From Lake City/Bothell Rd
1. Drive eastbound until the road turns into State Route 522 N (this occurs at the I-405 interchange).
2. Follow Steps 2-5 listed above under From Interstate 405.

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Vashon Treatment Plant

9615 SW 171st Street
Vashon, WA 98070
206-463-7318
View Map

From Seattle
1. Take the West Seattle Bridge to West Seattle.
2. Stay straight to go on to Fauntleroy Way SW
3. Stay on Fauntleroy until you get to the Fauntleroy-Vashon Ferry (external link)
4. At the end of the ferry driveway, turn left onto Vashon Highway SW
5. Proceed 4.4 miles and turn left onto SW 171 st Street.
6. Turn right into the driveway at the Vashon Treatment Plant at 9621 SW 171 st St
7. Parking is available at the administrative building at the top of the driveway.

From Tacoma
1. Take the Point Definace-Tahlequah Ferry (external link)
2. Exit the ferry driveway and turn left onto Vashon Highway SW
3. Proceed 9.2 miles
4. Turn right on SW 171 st Street
5. Turn right into the driveway at the Vashon Treatment Plant at 9621 SW 171 st St
6. Parking is available at the administrative building at the top of the driveway.

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Updated: July 1, 2008