St. Charles County, MO

Providing & Protecting our Most Precious Resource

Mailing Address

P.O. Box 967
O’Fallon, MO 63366-0967


Contact Information


24 Hours a Day
7 Days a Week

Welcome to Public Water Supply District No. 2

With offices at 100 Water Drive in O’Fallon, Missouri, Water District 2 has grown from a small, rural water district at its inception to the largest water district in the State of Missouri serving a population of about 75,000 people. Some of that growth is attributable to acquisitions of other utilities, but most of it comes from the addition of customers coming directly into our service area, now encompassing over 400 square miles. The service area includes the communities of Lake St. Louis, Defiance, New Melle, Augusta, Dardenne Prairie, Dutzow and parts of O’Fallon, Weldon Spring, Foristell, Innsbrook and unincorporated St. Charles and Warren Counties.

Recent and ongoing construction projects for the Water District include a new water tower in Warrenton, four replacement wells to feed the District’s Defiance Water Treatment Plant, and new larger water lines throughout the service area. Other pipelines, pump stations and wastewater facilities are also being planned. These projects are aimed at continuing our reliable, high quality service to our customers.

Bill Payment Methods

The goal of our employees is to serve you.

For your payment convenience we offer/accept:

Our Mission is to provide a reliable supply of quality and safe drinking water and proper collection and thorough treatment of wastewater for its customers at a reasonable cost.

Water Quality Reports

The Environmental Protection Agency, under the Consumer Confidence Rule, requires public water suppliers that serve the same people year round (community water systems) to provide consumer confidence reports (CCR) to their customers. These reports are also known as annual water quality reports or drinking water quality reports.


2017 Main System (includes parts of O’Fallon, Lake Saint Louis, Wentzville, Dardenne Prairie, New Melle, Defiance, Weldon Springs, and Matson)

2017 Augusta

2017 Dutzow

2017 Innsbrook

2017 North Oak

2017 Hickory Trails

2017 Foristell

2017 Sumac Ridge