Water Quality/Hardness 

The Cottage Grove Utility Department is continuously maintaining and upgrading the infrastructure required to bring the residents and businesses of the City a safe and abundant supply of water.

Water Quality/Hardness (milligrams per liter or parts per million (mg/L))

Chlorine: 0.4 mg/L

Fluoride: 1.1 mg/L

Alkalinity: 236 mg/L

pH: 7.6

Hardness: 298 mg/L (17 grains per gallon)


Water Quality Reports


Water Quality Report - 2021

Water Quality Report - 2020

Water Quality Report - 2019

Water Quality Report - 2018