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Willamette Water Treatment Plant

Raw water intake

450,000m³/day

Water treatment capacity

57,000m³/day

Treatment expansion capacity

265,000m³/day

Back-up storage

42,000m³

Population served

12,000

Seasonal water demand

7,500m³/day (winter); 22,000m³/day (summer)

Main plant elements

Screening; enhanced sedimentation; ozonation; dual media filtration; secondary disinfection (chlorine)

Filter layers

Granular activated carbon (2m) and sand (0.3m)

Total site footprint

10 acres (4ha)

Project cost

$43.8 million

Microbial contaminants

Nil detected (Coliform, Faecal Coliform, <i>Giardia Cryptosporidium</i>)

Turbidity

0.03 to 0.09 turbidity units

Nutrients (nitrate + nitrite)

0.3ppm to 0.8ppm

Inorganic chemicals

Arsenic - <0.1ppb; barium - 4ppb to 7ppb; other regulated inorganics - nil; VOCs - nil; synthetic organic chemicals - nil

Disinfection by-products

Bromate - nil; total trihalomethanes - 10ppb to 24ppb; total haloacetic acids - 3ppb to 7ppb

Project commencement

January 2000

Clearwell hydrostatic testing

May 2001

Operation commenced

April 2002

NorthWest Construction Excellence Award

2002

ASLA Award for Merit

2004

Plant owners

City of Wilsonville

Operators

US Filter Operating Services

Main contractors

Montgomery Watson Harza

Architect

Miller Hull Partnership

Landscaping

Murase Associates

Other contractors / suppliers

Slayden Construction; Natt McDougall Co.; Tigard Electric; Landtech Solutions; US Filter
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