Missouri's water quality revealed: Key insights from the 2025 public water systems census

The Missouri Department of Natural Resources has released the 2025 Annual Census of Missouri Public Water Systems.

The annual census provides detailed information regarding the volume, source water type, population, chemical characteristics, and other information about Missouri’s 2,802 public drinking water systems.

The census also includes test results for selected chemicals along with the types of treatments used by Missouri water systems. This information can be useful to citizens, water systems, public officials, consulting engineers and regional planners who want to learn more about their public water system.

The department prepares the census annually as required by Section 640.120 of the Revised Statutes of Missouri. The 2025 Census of Missouri Public Water Systems is available online at dnr.mo.gov/water/hows-water/water-we-drink/drinking-reports/census-public-systems.

In addition to the annual census, the department makes a number of online resources available to assist the public with learning more about the quality of water produced by their water system:

Annual Consumer Confidence Reports for each community water system: dnr.mo.gov/ccr.

Annual Compliance Report, which documents public drinking water system's compliance with the Safe Drinking Water Act: mo.gov/water/hows-water/water-we-drink/drinking-reports/compliance.

The Drinking Water Watch website for information regarding individual water system compliance and monitoring data: mo.gov/DWW/landing_MO.jsp.

For more information, contact Missouri Department of Natural Resources, Public Drinking Water Branch, P.O. Box 176, Jefferson City, MO 65102-0176 or by phone at 573-751-5331 or 800-361-4827.