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Backflow Prevention

Drinking water is one of our most precious resources and at Des Moines Water Works (DMWW) we strive to bring the safest and best tasting water to Des Moines residents. DMWW manages an active Cross-Connection Control program to meet state and local plumbing codes. This proactive approach is designed to prevent the possible contamination of the public water supply through backflow from customers’ facilities. Our program brochure  and rural brochure outlines how contamination can happen and how DMWW solves the problem.

DMWW works with specific backflow testers and testing companies that we know do the most outstanding work, so we can continue to provide you with quality water. DMWW has compiled a list of plumbers and testers  .

To learn about specific backflow regulations, DMWW has provided a detailed overview of those regulations here.


Cross-Connection program brochure 

Rural Cross-Connection program brochure

Water Usage Inventory Form

Backflow Test Form

Standard for Determining Degree of Hazard 

Plumbers List

Backflow Tester List


DSMH20 - DMWW Blog

For the latest news in water quality, customer service and other water-related hot topics, visit DMWW's blog.

Project H20

Project H20

Learn about DMWW's voluntary program to assist low-income households in the Des Moines metro.