Ottawa, IL City of Ottawa, Illinois

Ottawa's Water Treatment Plant History

This facility represents the culmination of the foresight of the previous City Administration and the determination of the present City Administration to provide safe, high quality water for the citizens of our community.

The city depends on the water from deep sandstone aquifers. There are currently four wells at an average of 1,200 feet deep which produce the city's average daily demand of 2.4 million gallons. The water supply contains an elevated level of radium as well as hardness, and total dissolved solids.

After careful evaluation of all of the water treatment options available for the removal of radium, the City selected Reverse Osmosis Membrane Filtration Treatment. For reasons based on cost and operational flexibility, the city's daily usage is produced at two treatment facilities, one here at the Central Plant and one at Well 10 site.

Each treatment unit will generate a permeate or processed clean water stream of the raw water stream. They will also produce a concentrate waste of 125 gallons per minute, which is discharged by permit to the Fox River.

The new treatment process greatly improves the City's water quality and allows the City to comply with clean water regulations.

COMBINED PLANT DATA

Treatment Capacity per Unit ..(1045 GPM) 1.5 MGD

Total Treatment Capacity ... (4180 GPM) 6.02 MGD

Raw Water Supply per Well .................. 1170 GPM

Concentrate Waste Stream per Unit ......... 125 GPM

Clearwell Size ................................... 466,000 GAL

Average daily Use ..................................... 2.4 MGD

Maximum Daily use .................................. 4.3 MGD

Array ............................................................... 22:8

Membranes per Housing ....................................... 7